Climate and average weather in El Rosario
In El Rosario, the weather is muggy, hot, wet, and mostly clear and remarkably steady, with daytime highs holding near hot levels all year. The wettest stretch peaks around August.
Over the course of the year, the temperature in El Rosario typically varies from 13°C to 32°C, and is rarely below 9°C or above 34°C. June is the hottest month of the year, while January is the coldest.
Based on the travel score, the best times of year to visit El Rosario for warm-weather activities are from early January to early April and mid November to late December.
- Hottest
- Jun
- 32°
- Coldest
- Jan
- 13°
- Wettest
- Aug
- 281 mm
- Driest
- Apr
- 1 mm
- Rain / yr
- 1019 mm
- 105 wet days
- Daylight
- 10.6–13.4 h
- shortest–longest
- Elevation
- 33 m
- 23.0°N
- Clearest
- May
- 25% cloud
El Rosario weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around early January to early April.
Temperature through the year
Daily average highs and lows in El Rosario, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
Temperatures in El Rosario stay fairly even through the year, without a distinct hot or cool season. The warmest month is June, with an average high of 32°C and low of 23°C; the coolest is January, with an average low of 13°C and high of 26°C.
Days typically run about 11°C warmer than nights, with the widest day–night swing (around 14°C) in March.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 26 | 27 | 29 | 30 | 32 | 32 | 31 | 30 | 30 | 30 | 29 | 27 |
| Avg low (°C) | 13 | 13 | 14 | 16 | 19 | 23 | 23 | 23 | 23 | 21 | 17 | 14 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 26 | 13 |
| Feb | 27 | 13 |
| Mar | 29 | 14 |
| Apr | 30 | 16 |
| May | 32 | 19 |
| Jun | 32 | 23 |
| Jul | 31 | 23 |
| Aug | 30 | 23 |
| Sep | 30 | 23 |
| Oct | 30 | 21 |
| Nov | 29 | 17 |
| Dec | 27 | 14 |
How hot and cold El Rosario really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the hottest afternoons, once humidity is folded in, El Rosario feels like about 37°C (around August 7). About 173 days a year carry some heat stress, peaking in August.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°C) | 26 | 27 | 29 | 30 | 33 | 35 | 36 | 36 | 36 | 34 | 30 | 27 |
| Air high (°C) | 26 | 27 | 29 | 30 | 32 | 32 | 31 | 30 | 30 | 30 | 29 | 27 |
| Feels-like low (°C) | 13 | 13 | 14 | 16 | 19 | 23 | 23 | 23 | 23 | 21 | 17 | 14 |
| Air low (°C) | 13 | 13 | 14 | 16 | 19 | 23 | 23 | 23 | 23 | 21 | 17 | 14 |
| Feels-like high (°C) | Air high (°C) | Feels-like low (°C) | Air low (°C) | |
|---|---|---|---|---|
| Jan | 26 | 26 | 13 | 13 |
| Feb | 27 | 27 | 13 | 13 |
| Mar | 29 | 29 | 14 | 14 |
| Apr | 30 | 30 | 16 | 16 |
| May | 33 | 32 | 19 | 19 |
| Jun | 35 | 32 | 23 | 23 |
| Jul | 36 | 31 | 23 | 23 |
| Aug | 36 | 30 | 23 | 23 |
| Sep | 36 | 30 | 23 | 23 |
| Oct | 34 | 30 | 21 | 21 |
| Nov | 30 | 29 | 17 | 17 |
| Dec | 27 | 27 | 14 | 14 |
Average hourly temperature in El Rosario
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on June afternoons, near 32°C, and coldest before dawn in January, near 13°C.
El Rosario weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 26° / 13° | 20 | 2.1 | 10.7 | 8.1 |
| Feb | 27° / 13° | 19 | 1.4 | 11.2 | 8.1 |
| Mar | 29° / 14° | 5 | 0.6 | 11.8 | 7.4 |
| Apr | 30° / 16° | 1 | 0.2 | 12.5 | 6.3 |
| May | 32° / 19° | 3 | 0.5 | 13.1 | 5.2 |
| Jun | 32° / 23° | 70 | 9.3 | 13.4 | 4.1 |
| Jul | 31° / 23° | 236 | 24 | 13.3 | 3.0 |
| Aug | 30° / 23° | 281 | 26.1 | 12.8 | 2.9 |
| Sep | 30° / 23° | 244 | 24.3 | 12.1 | 3.2 |
| Oct | 30° / 21° | 92 | 11.3 | 11.5 | 5.0 |
| Nov | 29° / 17° | 30 | 2.6 | 10.9 | 6.9 |
| Dec | 27° / 14° | 18 | 2.3 | 10.6 | 8.0 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
El Rosario gets about 1019 mm of precipitation a year. On a typical day the chance of rain is some rain, but that rises and falls sharply with the seasons.
The wetter season lasts 4.2 months, from around Jun 16 to Oct 20, peaking in September at about 88% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Apr 19.
August is the wettest month by volume, with 281 mm over about 26 wet days; April is the driest, with 1 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 7 | 5 | 2 | 1 | 3 | 32 | 76 | 84 | 80 | 36 | 10 | 7 |
| Rain days | 2 | 1 | 1 | 0 | 1 | 9 | 24 | 26 | 24 | 11 | 3 | 2 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 7 | 2 |
| Feb | 5 | 1 |
| Mar | 2 | 1 |
| Apr | 1 | 0 |
| May | 3 | 1 |
| Jun | 32 | 9 |
| Jul | 76 | 24 |
| Aug | 84 | 26 |
| Sep | 80 | 24 |
| Oct | 36 | 11 |
| Nov | 10 | 3 |
| Dec | 7 | 2 |
Monthly rainfall
Over a full year, El Rosario collects about 1019 mm of rain across 105 wet days — roughly 85 mm in an average month.
It doesn’t fall evenly. August is the wettest month with 281 mm, while April is the driest at just 1 mm. The three wettest months alone bring about 75% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 20 | 19 | 5 | 1 | 3 | 70 | 236 | 281 | 244 | 92 | 30 | 18 |
| Rain days | 2 | 1 | 1 | 0 | 1 | 9 | 24 | 26 | 24 | 11 | 3 | 2 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 20 | 2 |
| Feb | 19 | 1 |
| Mar | 5 | 1 |
| Apr | 1 | 0 |
| May | 3 | 1 |
| Jun | 70 | 9 |
| Jul | 236 | 24 |
| Aug | 281 | 26 |
| Sep | 244 | 24 |
| Oct | 92 | 11 |
| Nov | 30 | 3 |
| Dec | 18 | 2 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In El Rosario, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around October 9 and lasts for 8.3 months, ending around June 17. The clearest month is May, when the sky is clear, mostly clear, or partly cloudy 84% of the time on average.
The cloudier part of the year begins around June 18 and lasts for 3.7 months, ending around October 8. The cloudiest month is August, when it is overcast or mostly cloudy 84% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 67 | 70 | 74 | 72 | 84 | 60 | 18 | 16 | 26 | 66 | 77 | 67 |
| Cloudier (%) | 33 | 30 | 26 | 28 | 16 | 40 | 82 | 84 | 74 | 34 | 23 | 33 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 67 | 33 |
| Feb | 70 | 30 |
| Mar | 74 | 26 |
| Apr | 72 | 28 |
| May | 84 | 16 |
| Jun | 60 | 40 |
| Jul | 18 | 82 |
| Aug | 16 | 84 |
| Sep | 26 | 74 |
| Oct | 66 | 34 |
| Nov | 77 | 23 |
| Dec | 67 | 33 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 7, brings about 13 h 24 min of light; the shortest, around January 1, only 10 h 36 min — a swing of roughly 2 h 48 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 10.7 | 11.2 | 11.8 | 12.5 | 13.1 | 13.4 | 13.3 | 12.8 | 12.1 | 11.5 | 10.9 | 10.6 |
| Sunrise (AM) | 6:51 | 6:42 | 6:18 | 5:48 | 5:27 | 5:22 | 5:30 | 5:43 | 5:54 | 6:05 | 6:22 | 6:42 |
| Sunset (PM) | 5:35 | 5:54 | 6:08 | 6:20 | 6:33 | 6:46 | 6:48 | 6:32 | 6:02 | 5:32 | 5:15 | 5:17 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 10.7 | 6:51 | 5:35 |
| Feb | 11.2 | 6:42 | 5:54 |
| Mar | 11.8 | 6:18 | 6:08 |
| Apr | 12.5 | 5:48 | 6:20 |
| May | 13.1 | 5:27 | 6:33 |
| Jun | 13.4 | 5:22 | 6:46 |
| Jul | 13.3 | 5:30 | 6:48 |
| Aug | 12.8 | 5:43 | 6:32 |
| Sep | 12.1 | 5:54 | 6:02 |
| Oct | 11.5 | 6:05 | 5:32 |
| Nov | 10.9 | 6:22 | 5:15 |
| Dec | 10.6 | 6:42 | 5:17 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
El Rosario averages about 14 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 1 and 23 days.
The sunnier stretch runs 8.0 months, from around Oct 15 to Jun 15. The sunniest month is May, with roughly 22 sunny days (bright).
The greyest month is August, down near 1 sunny days — about 96% fewer than the May peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 17 | 16 | 20 | 18 | 22 | 13 | 2 | 1 | 2 | 14 | 19 | 17 |
| Sky | Bright | Bright | Bright | Bright | Bright | Mixed | Gloomy | Gloomy | Gloomy | Mixed | Bright | Bright |
| Sunny days | Sky | |
|---|---|---|
| Jan | 17 | Bright |
| Feb | 16 | Bright |
| Mar | 20 | Bright |
| Apr | 18 | Bright |
| May | 22 | Bright |
| Jun | 13 | Mixed |
| Jul | 2 | Gloomy |
| Aug | 1 | Gloomy |
| Sep | 2 | Gloomy |
| Oct | 14 | Mixed |
| Nov | 19 | Bright |
| Dec | 17 | Bright |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In El Rosario, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 6.7 months, from around May 10 to November 28. The muggiest month is June, when the air feels humid, muggy or worse about 100% of the time.
The most comfortable stretch runs from around November 29 to May 9, and January is the most comfortable month — the air is dry or comfortable 78% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 28 | 22 | 16 | 11 | 2 | 0 | 0 | 0 | 0 | 0 | 3 | 18 |
| Comfortable (%) | 50 | 50 | 56 | 45 | 19 | 0 | 0 | 0 | 0 | 1 | 12 | 40 |
| Humid (%) | 21 | 27 | 28 | 39 | 39 | 5 | 0 | 0 | 0 | 3 | 30 | 35 |
| Muggy (%) | 0 | 1 | 0 | 4 | 36 | 37 | 2 | 0 | 0 | 18 | 40 | 7 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 5 | 54 | 65 | 48 | 48 | 59 | 14 | 0 |
| Miserable (%) | 0 | 0 | 0 | 0 | 0 | 5 | 32 | 52 | 51 | 18 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|---|
| Jan | 28 | 50 | 21 | 0 | 0 | 0 |
| Feb | 22 | 50 | 27 | 1 | 0 | 0 |
| Mar | 16 | 56 | 28 | 0 | 0 | 0 |
| Apr | 11 | 45 | 39 | 4 | 0 | 0 |
| May | 2 | 19 | 39 | 36 | 5 | 0 |
| Jun | 0 | 0 | 5 | 37 | 54 | 5 |
| Jul | 0 | 0 | 0 | 2 | 65 | 32 |
| Aug | 0 | 0 | 0 | 0 | 48 | 52 |
| Sep | 0 | 0 | 0 | 0 | 48 | 51 |
| Oct | 0 | 1 | 3 | 18 | 59 | 18 |
| Nov | 3 | 12 | 30 | 40 | 14 | 0 |
| Dec | 18 | 40 | 35 | 7 | 0 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Wind in El Rosario is steady company: average speeds sit near 5 km/h — calm — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 5 | 5 | 5 | 6 | 6 | 6 | 4 | 4 | 4 | 4 | 5 | 5 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 5 | calm |
| Feb | 5 | calm |
| Mar | 5 | calm |
| Apr | 6 | calm |
| May | 6 | calm |
| Jun | 6 | calm |
| Jul | 4 | calm |
| Aug | 4 | calm |
| Sep | 4 | calm |
| Oct | 4 | calm |
| Nov | 5 | calm |
| Dec | 5 | calm |
Hazard calendar for El Rosario
When the seasonal hazards worth planning around — the rainy season, tropical-cyclone risk and dust haze — are active through the year.
El Rosario sits in the eastern Pacific hurricane zone; the season peaks August–September.
El Rosario's monsoon runs July–September, when most of the year's rain falls.
Best time to visit El Rosario
To characterize how pleasant the weather is in El Rosario throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late March, El Rosario is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit El Rosario for general outdoor tourist activities is from mid November to early April, with a peak score in the third week of January.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 8.1 | 8.1 | 7.4 | 6.2 | 5.2 | 4.1 | 3.0 | 2.9 | 3.2 | 5.0 | 6.9 | 8.0 |
| Rating | ideal | ideal | good | good | fair | fair | poor | poor | poor | fair | good | ideal |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 8.1 | ideal |
| Feb | 8.1 | ideal |
| Mar | 7.4 | good |
| Apr | 6.2 | good |
| May | 5.2 | fair |
| Jun | 4.1 | fair |
| Jul | 3.0 | poor |
| Aug | 2.9 | poor |
| Sep | 3.2 | poor |
| Oct | 5.0 | fair |
| Nov | 6.9 | good |
| Dec | 8.0 | ideal |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit El Rosario for hot-weather activities is from late October to mid June, with a peak score in the last week of March.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for El Rosario, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
El Rosario packs about the same all year — highs hold near 32°C. Across the year the things worth having are light clothes, rain gear and sun protection.
In June, El Rosario sees daytime highs around 32°C and nights near 23°C. Pack light clothes and sun protection. Worth having: rain gear. About 9 days see rain.
Sea temperature near El Rosario
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
The sea at the nearest coast (about 31 km away) is warmest in August at about 30°C and coldest in March near 23°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 24 | 23 | 23 | 23 | 26 | 28 | 29 | 30 | 30 | 30 | 28 | 25 |
| Comfort | Refreshing | Refreshing | Refreshing | Refreshing | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 24 | Refreshing |
| Feb | 23 | Refreshing |
| Mar | 23 | Refreshing |
| Apr | 23 | Refreshing |
| May | 26 | Warm |
| Jun | 28 | Warm |
| Jul | 29 | Tropical |
| Aug | 30 | Tropical |
| Sep | 30 | Tropical |
| Oct | 30 | Tropical |
| Nov | 28 | Warm |
| Dec | 25 | Warm |
UV index (midday) in El Rosario by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in El Rosario peaks around May 17 at about 12 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 6 (high).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 6 | 9 | 10 | 12 | 12 | 12 | 12 | 12 | 11 | 8 | 6 | 6 |
| Level | High | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 6 | High |
| Feb | 9 | Very high |
| Mar | 10 | Extreme |
| Apr | 12 | Extreme |
| May | 12 | Extreme |
| Jun | 12 | Extreme |
| Jul | 12 | Extreme |
| Aug | 12 | Extreme |
| Sep | 11 | Extreme |
| Oct | 8 | Very high |
| Nov | 6 | High |
| Dec | 6 | High |
Average hourly UV index in El Rosario
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in May the burn window is concentrated in the middle of the day: about 8.5 hours a day reach index 3 (protection recommended), and 6.5 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 5.5 | 6.5 | 7.5 | 8 | 8.5 | 8.5 | 8.5 | 8 | 7.5 | 6.5 | 5.5 | 5 |
| UV ≥ 6 (h/day) | 0 | 4 | 5.5 | 6 | 6.5 | 6.5 | 6 | 6 | 5.5 | 4 | 1.5 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 5.5 | 0 |
| Feb | 6.5 | 4 |
| Mar | 7.5 | 5.5 |
| Apr | 8 | 6 |
| May | 8.5 | 6.5 |
| Jun | 8.5 | 6.5 |
| Jul | 8.5 | 6 |
| Aug | 8 | 6 |
| Sep | 7.5 | 5.5 |
| Oct | 6.5 | 4 |
| Nov | 5.5 | 1.5 |
| Dec | 5 | 0 |
Air quality in El Rosario by month
Average fine-particle pollution (PM2.5) through the year — so you can see which months the air is worst, not just the yearly average.
Air quality in El Rosario is worst in May — around 22 µg/m³ PM2.5 (moderate), about 3.8× the cleanest month (January, 6 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 6 | 6 | 7 | 11 | 22 | 14 | 8 | 8 | 9 | 8 | 7 | 6 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Good | Good | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 6 | Good |
| Mar | 7 | Good |
| Apr | 11 | Good |
| May | 22 | Moderate |
| Jun | 14 | Moderate |
| Jul | 8 | Good |
| Aug | 8 | Good |
| Sep | 9 | Good |
| Oct | 8 | Good |
| Nov | 7 | Good |
| Dec | 6 | Good |
Growing season
El Rosario is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 100 | 0 |
| Feb | 100 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 100 | 0 |
Growing degree days
Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. El Rosario banks about 5,068 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around June.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 295 | 290 | 356 | 397 | 482 | 519 | 531 | 521 | 495 | 480 | 384 | 317 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 295 |
| Feb | 290 |
| Mar | 356 |
| Apr | 397 |
| May | 482 |
| Jun | 519 |
| Jul | 531 |
| Aug | 521 |
| Sep | 495 |
| Oct | 480 |
| Nov | 384 |
| Dec | 317 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
El Rosario receives about 5.6 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 4.3 and 7.7 kWh/m².
The brighter stretch of the year lasts 4.3 months, from around Feb 18 to Jun 29. The brightest month is May, averaging about 7.6 kWh/m² (intense).
The dimmest month is December, down near 4.3 kWh/m² — roughly 43% less than the May peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 4.5 | 5.5 | 6.6 | 7.4 | 7.7 | 6.3 | 5.3 | 5.0 | 4.6 | 4.9 | 4.7 | 4.3 |
| Level | Bright | Bright | Intense | Intense | Intense | Intense | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 4.5 | Bright |
| Feb | 5.5 | Bright |
| Mar | 6.6 | Intense |
| Apr | 7.4 | Intense |
| May | 7.7 | Intense |
| Jun | 6.3 | Intense |
| Jul | 5.3 | Bright |
| Aug | 5.0 | Bright |
| Sep | 4.6 | Bright |
| Oct | 4.9 | Bright |
| Nov | 4.7 | Bright |
| Dec | 4.3 | Bright |
Where is El Rosario?
El Rosario sits at 23.0°N, 105.9°W, 33 m above sea level, in Mexico. The nearest listed city is Escuinapa de Hidalgo, 19 km away.
Topography around El Rosario
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of El Rosario.
Within 3 km, the terrain around El Rosario has only modest variations in elevation — a maximum elevation change of 222 m around an average of 42 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 915 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,912 m.
The land around El Rosario is covered by trees (43%) and cropland (25%) within 3 km, trees (68%) within 16 km, and trees (59%) and water (25%) within 80 km.
Mexico travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type A / B
- 120 / 127 V · 60 Hz
- Prices
- ≈ 54% of US
- price level, 2025
- GDP per capita
- $13,889
- 2025
- Happiness
- 7.0 / 10
- World Happiness, 2025
- Safe drinking water
- 43%
- of population, 2024
- Homicide rate
- 24.9
- per 100k, 2023
- Road deaths
- 12.8
- per 100k/yr, 2019
- Income group
- Upper middle
- World Bank
- English
- Very low
- EF EPI 440
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for El Rosario (22.9903°, -105.8542°, elevation 33 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).