Climate and average weather in Fresnillo

In Fresnillo, the summers are hot, fairly dry, and mostly clear and the winters are mild and mostly clear.

Best: late September to late April

Over the course of the year, the temperature in Fresnillo typically varies from 5°C to 29°C, and is rarely below 1°C or above 32°C. May is the hottest month of the year, while January is the coldest.

Based on the travel score, the best time of year to visit Fresnillo for warm-weather activities is from late September to late April.

Hottest
May
29°
Coldest
Jan
Wettest
Sep
98 mm
Driest
Dec
8 mm
Rain / yr
452 mm
67 wet days
Daylight
10.6–13.4 h
shortest–longest
Elevation
2,192 m
23.2°N
Clearest
Nov
34% cloud

Fresnillo is city in Fresnillo Municipality, Zacatecas, Mexico.

Density
29/km²
people per km²
Founded
1554

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Fresnillo 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 late September to late April.

Temperature through the year

Average highAverage lowShaded bands: 10–90% of days

Daily average highs and lows in Fresnillo, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.

The hot season lasts 2.6 months, from April 10 to June 27, with daily high temperatures above 27°C. The hottest month of the year in Fresnillo is May, with an average high of 29°C and low of 14°C.

The cool season lasts 2.4 months, from November 30 to February 9, with daily high temperatures below 22°C. The coldest month of the year in Fresnillo is January, with an average low of 5°C and high of 20°C.

Days typically run about 14°C warmer than nights, with the widest day–night swing (around 16°C) in April.

10°20°30°JanFebMarAprMayJunJulAugSepOctNovDec
Avg high (°C)Avg low (°C)
Jan205
Feb227
Mar259
Apr2711
May2914
Jun2815
Jul2614
Aug2614
Sep2413
Oct2411
Nov228
Dec206

Average hourly temperature in Fresnillo

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 May afternoons, near 29°C, and coldest before dawn in January, near C.

JanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM

Fresnillo weather by month

Every month at a glance. Click a month for its detailed page.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan20° / 152.610.77.7
Feb22° / 111.611.28.4
Mar25° / 81.611.88.6
Apr27° / 11°92.212.57.8
May29° / 14°204.713.16.5
Jun28° / 15°689.713.46.2
Jul26° / 14°9411.813.36.5
Aug26° / 14°7910.912.86.6
Sep24° / 13°981312.16.5
Oct24° / 11°315.311.58.0
Nov22° / 132.310.98.4
Dec20° / 81.510.67.9

Chance of rain

How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.

Fresnillo gets about 452 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 4.7 months, from around May 26 to Oct 15, peaking in September at about 47% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Feb 22.

September is the wettest month by volume, with 98 mm over about 13 wet days; December is the driest, with 8 mm.

0%10%20%30%40%50%60%JanFebMarAprMayJunJulAugSepOctNovDecdrierwetterdriermostly drysome rainoften wetvery wetSep 5 · 47%Feb 22 · 4%
Rain on a day (%)Rain days
Jan83
Feb62
Mar52
Apr72
May155
Jun3310
Jul3712
Aug3711
Sep4113
Oct185
Nov82
Dec52

Monthly rainfall

Over a full year, Fresnillo collects about 452 mm of rain across 67 wet days — roughly 38 mm in an average month.

It doesn’t fall evenly. September is the wettest month with 98 mm, while December is the driest at just 8 mm. The three wettest months alone bring about 60% of the year’s total.

0255075100125JanFebMarAprMayJunJulAugSepOctNovDec151189206894799831138
Rainfall (mm)Rain days
Jan153
Feb112
Mar82
Apr92
May205
Jun6810
Jul9412
Aug7911
Sep9813
Oct315
Nov132
Dec82

Clouds and sunshine

ClearMostly clearPartly cloudyMostly cloudyOvercast

How often the daytime sky is clear, partly cloudy or overcast.

In Fresnillo, 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 February 3 and lasts for 4.6 months, ending around June 21. The clearest month is May, when the sky is clear, mostly clear, or partly cloudy 77% of the time on average.

The cloudier part of the year begins around June 22 and lasts for 3.8 months, ending around October 14. The cloudiest month is September, when it is overcast or mostly cloudy 50% of the time.

0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JanFebMarAprMayJunJulAugSepOctNovDecMay 28 · 81%Sep 8 · 47%clearmostly clearpartly cloudymostly cloudyovercastcloudierclearercloudier
Clearer (%)Cloudier (%)
Jan6535
Feb7030
Mar7228
Apr6832
May7723
Jun7129
Jul5941
Aug5941
Sep5050
Oct6733
Nov7426
Dec6733

Daylight, sunrise and sunset

DaylightNight

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 5, 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.

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDec
Daylight (h)Sunrise (AM)Sunset (PM)
Jan10.77:396:22
Feb11.27:306:42
Mar11.87:066:56
Apr12.56:367:08
May13.16:147:21
Jun13.46:097:34
Jul13.36:187:36
Aug12.86:317:20
Sep12.16:426:50
Oct11.56:536:20
Nov10.97:116:03
Dec10.67:306:05

Sunny days

How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.

Fresnillo averages about 15 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 8 and 19 days.

The sunnier stretch runs 5.9 months, from around Oct 14 to Apr 12. The sunniest month is November, with roughly 19 sunny days (bright).

The greyest month is September, down near 9 sunny days — about 51% fewer than the November peak.

0510152025JanFebMarAprMayJunJulAugSepOctNovDecsunniergreyersunniergloomymixedbrightbrilliantNov 2219 daysSep 58 days
Sunny daysSky
Jan16Bright
Feb16Bright
Mar18Bright
Apr15Mixed
May16Bright
Jun13Mixed
Jul12Mixed
Aug12Mixed
Sep9Mixed
Oct15Bright
Nov18Bright
Dec16Bright

Humidity comfort

DryComfortableHumidMuggyOppressiveMiserable

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 Fresnillo, the air stays dry or comfortable essentially all year. Even in September, the muggiest month, it feels humid or worse only about 1% of the time — humidity is not something you need to plan around here.

0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDeccomfortabledry
Dry (%)Comfortable (%)Humid (%)
Jan10000
Feb10000
Mar10000
Apr10000
May9910
Jun81190
Jul76240
Aug74260
Sep66331
Oct9370
Nov10000
Dec10000

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.

Across the year, average wind speed in Fresnillo is typically calm, near 12 km/h, and varies little with the seasons.

The windier part of the year lasts 4.9 months, from around Dec 15 to May 12. The windiest month is April, averaging about 13 km/h (light breeze).

The calmer part of the year runs from around May 13 to Dec 14, with October the calmest month at about 10 km/h.

05101520JanFebMarAprMayJunJulAugSepOctNovDecwindiercalmercalmlight breezeApr 2 · 14 km/hOct 8 · 10 km/h
Wind speed (km/h)Feels
Jan12light breeze
Feb13light breeze
Mar14light breeze
Apr13light breeze
May11calm
Jun11calm
Jul11calm
Aug11calm
Sep10calm
Oct10calm
Nov11calm
Dec12calm

Best time to visit Fresnillo

TravelBeach/poolTemperatureCloudsPrecipitation

To characterize how pleasant the weather is in Fresnillo throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.

Around early October, Fresnillo is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.

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 Fresnillo for general outdoor tourist activities is from late September to late April, with a peak score in the last week of February.

0246810JanFebMarAprMayJunJulAugSepOctNovDecbest timebest timetravel scoretemperaturecloudsprecipitationFeb 27 · 8.8

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).

Travel score (0–10)Rating
Jan7.7ideal
Feb8.4ideal
Mar8.6ideal
Apr7.8ideal
May6.5good
Jun6.2good
Jul6.5good
Aug6.6good
Sep6.5good
Oct8.0ideal
Nov8.4ideal
Dec7.9ideal

The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best times of year to visit Fresnillo for hot-weather activities run from late February to late June and again from early October to early November, with a peak score in the first week of May.

024681012JanFebMarAprMayJunJulAugSepOctNovDecbest timebest timebeach/pool scoretemperaturecloudsprecipitationMay 2 · 8.2

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 Fresnillo, by month

EssentialRecommendedOptional

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.

For a warm-season trip around May (highs near 29°C), the essentials are light clothes and sun protection. In the cold season around January (highs near 20°C), pack a warm layer and sun protection.

Light clothing
Warm layer
Winter coat
Rain gear
Sun protection
Windbreaker

In May, Fresnillo sees daytime highs around 29°C and nights near 14°C. Pack light clothes and sun protection. About 5 days see rain.

UV index (midday) in Fresnillo by month

LowModerateHighVery highExtreme

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 Fresnillo peaks around May 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 7 (high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecVery highExtremeVery highHighMay 16UV 14Dec 19UV 7
UV index (midday)Level
Jan7High
Feb10Very high
Mar12Extreme
Apr14Extreme
May14Extreme
Jun14Extreme
Jul13Extreme
Aug14Extreme
Sep13Extreme
Oct10Very high
Nov7Very high
Dec7High

Average hourly UV index in Fresnillo

LowModerateHighVery highExtreme

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 9 hours a day reach index 3 (protection recommended), and 7 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.

JanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AM
UV ≥ 3 (h/day)UV ≥ 6 (h/day)
Jan63
Feb74.5
Mar86
Apr8.56.5
May97
Jun97
Jul97
Aug8.56.5
Sep86
Oct75
Nov63
Dec5.52
Almanac & agriculture

Growing season

Chance of a frost-free dayFrost-free year round

Fresnillo is frost-free year round — even the coldest nights rarely reach freezing, so there is no start or end to the growing season.

0%25%50%75%100%JanFebMarAprMayJunJulAugSepOctNovDecfrost-free year round
Frost-free chance (%)Frost nights
Jan970
Feb990
Mar1000
Apr1000
May1000
Jun1000
Jul1000
Aug1000
Sep1000
Oct1000
Nov1000
Dec980

Growing degree days

Degree days (base 10°C)Frost-free shaded

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. Fresnillo banks about 2,747 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around June.

01,0002,0003,000JanFebMarAprMayJunJulAugSepOctNovDec
Growing degree days (°C·days)
Jan77
Feb124
Mar202
Apr274
May347
Jun343
Jul322
Aug312
Sep267
Oct234
Nov151
Dec94

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.

Fresnillo receives about 6.2 kWh/m² a day of solar energy on average — intense — with a clear seasonal swing between 4.5 and 7.8 kWh/m².

The brighter stretch of the year lasts 6.0 months, from around Feb 25 to Aug 27. The brightest month is May, averaging about 7.8 kWh/m² (intense).

The dimmest month is December, down near 4.6 kWh/m² — roughly 41% less than the May peak.

0123456789JanFebMarAprMayJunJulAugSepOctNovDecdimmerbrighterdimmerdimmoderatebrightintenseMay 47.8 kWhDec 184.5 kWh
Solar energy (kWh/m²)Level
Jan4.8Bright
Feb5.8Bright
Mar6.9Intense
Apr7.6Intense
May7.8Intense
Jun7.3Intense
Jul7.0Intense
Aug6.7Intense
Sep5.7Bright
Oct5.5Bright
Nov5.0Bright
Dec4.6Bright

Where is Fresnillo?

Fresnillo sits at 23.2°N, 102.9°W, 2,192 m above sea level, in Mexico. The nearest listed city is Víctor Rosales, 30 km away.

Topography around Fresnillo

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Fresnillo.

Within 3 km, the terrain around Fresnillo has only modest variations in elevation — a maximum elevation change of 142 m around an average of 2,197 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 790 m; within 80 km, large variations in elevation — a maximum elevation change of 1,141 m.

The land around Fresnillo is covered by artificial surfaces (63%) within 3 km, shrubs (50%) and cropland (34%) within 16 km, and shrubs (54%) and cropland (31%) within 80 km.

3 km
142 m
16 km
790 m
80 km
1,141 m
treesshrubsgrasslandcroplandartificial surfacesbare terrain
Nearby: Víctor Rosales 30 km · Zacatecas 54 km · Guadalupe 60 km · Jerez de García Salinas 60 km · Río Grande 74 km · Sombrerete 94 km · Rincón de Romos 119 km · Pabellón de Arteaga 129 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
Catholic 78%no religion 11%other Evangelical Churches 8%Jehovah Witness 1%

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 Fresnillo (23.1749°, -102.8679°, elevation 2,192 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).