Calvillo weather in September
In September, Calvillo sees average daytime highs of 25°C and overnight lows near 14°C, with 127 mm of rain across 16.2 wet days and about 12.1 hours of daylight. It is the 8th-warmest and 3rd-wettest month of the year here.
Day-to-day highs hold fairly steady near 25°C through the month. The sky is clear or mostly clear about 22% of the time in September, and the air most often feels comfortable.
Daylight stretches from about 12 h 24 min at the start of September to 11 h 48 min by month's end. Set against the rest of the year, September is Calvillo's 12th-clearest and 9th-windiest month. For the whole year in context, see Calvillo's year-round climate.
- Daytime high
- 25°
- 8th warmest
- Overnight low
- 14°
- 9th coldest
- Rainfall
- 127 mm
- 16.2 wet days
- Daylight
- 12 h 06 min
- 6:41 AM – 6:49 PM
- Cloud cover
- 65%
- 12th clearest
- Wind
- 6 km/h
- 9th windiest
- Solar energy
- 5.64 kWh/m²
- Travel score
- 5.8
- out of 10
Calvillo is municipal seat of Calvillo, State of Aguascalientes, Mexico.
- Density
- 21/km²
- people per km²
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 25°C through the month.
A typical September day in Calvillo reaches about 25°C in the afternoon and slips back to 14°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 23°C and 27°C. Set against its neighbours, September runs about 1°C cooler than August and on par with October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Avg low (°C) | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 25 | 15 |
| 2 | 25 | 15 |
| 3 | 25 | 15 |
| 4 | 25 | 14 |
| 5 | 25 | 14 |
| 6 | 25 | 14 |
| 7 | 25 | 14 |
| 8 | 25 | 14 |
| 9 | 25 | 14 |
| 10 | 25 | 14 |
| 11 | 25 | 14 |
| 12 | 25 | 14 |
| 13 | 25 | 14 |
| 14 | 25 | 14 |
| 15 | 25 | 14 |
| 16 | 25 | 14 |
| 17 | 25 | 14 |
| 18 | 25 | 14 |
| 19 | 25 | 14 |
| 20 | 25 | 14 |
| 21 | 25 | 14 |
| 22 | 25 | 14 |
| 23 | 25 | 14 |
| 24 | 25 | 14 |
| 25 | 25 | 14 |
| 26 | 25 | 14 |
| 27 | 25 | 14 |
| 28 | 25 | 14 |
| 29 | 25 | 14 |
| 30 | 25 | 13 |
Calvillo weather by month
How September compares with the rest of the year at a glance. September is the 8th-warmest and 3rd-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 21° / 6° | 17 | 2.4 | 10.8 | 8.0 |
| Feb | 24° / 7° | 13 | 1.8 | 11.2 | 8.6 |
| Mar | 26° / 9° | 7 | 1.3 | 11.8 | 8.4 |
| Apr | 29° / 11° | 6 | 1.7 | 12.5 | 6.8 |
| May | 30° / 14° | 24 | 5.7 | 13 | 5.5 |
| Jun | 29° / 16° | 125 | 14.3 | 13.3 | 5.1 |
| Jul | 26° / 15° | 175 | 19.3 | 13.2 | 5.3 |
| Aug | 26° / 15° | 150 | 17.6 | 12.7 | 5.5 |
| Sep | 25° / 14° | 127 | 16.2 | 12.1 | 5.8 |
| Oct | 25° / 12° | 46 | 6.5 | 11.5 | 7.5 |
| Nov | 24° / 9° | 13 | 2.2 | 11 | 8.7 |
| Dec | 22° / 7° | 9 | 1.4 | 10.7 | 8.3 |
Cloud cover in September
The sky is clear or mostly clear about 22% of the time in September, the cloudiest month of the year.
Beyond those clear spells, partly cloudy skies cover about 22% of September, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to open up as the month goes on.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 42 | 42 | 41 | 42 | 42 | 42 | 41 | 42 | 42 | 42 | 42 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 44 | 45 | 45 | 45 | 46 | 46 | 47 | 48 | 48 | 49 | 50 |
| Cloudier (%) | 58 | 58 | 59 | 58 | 58 | 58 | 59 | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 56 | 55 | 55 | 55 | 54 | 54 | 53 | 52 | 52 | 51 | 50 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 42 | 58 |
| 2 | 42 | 58 |
| 3 | 41 | 59 |
| 4 | 42 | 58 |
| 5 | 42 | 58 |
| 6 | 42 | 58 |
| 7 | 41 | 59 |
| 8 | 42 | 58 |
| 9 | 42 | 58 |
| 10 | 42 | 58 |
| 11 | 42 | 58 |
| 12 | 43 | 57 |
| 13 | 43 | 57 |
| 14 | 43 | 57 |
| 15 | 43 | 57 |
| 16 | 43 | 57 |
| 17 | 43 | 57 |
| 18 | 43 | 57 |
| 19 | 43 | 57 |
| 20 | 44 | 56 |
| 21 | 45 | 55 |
| 22 | 45 | 55 |
| 23 | 45 | 55 |
| 24 | 46 | 54 |
| 25 | 46 | 54 |
| 26 | 47 | 53 |
| 27 | 48 | 52 |
| 28 | 48 | 52 |
| 29 | 49 | 51 |
| 30 | 50 | 50 |
Chance of precipitation in September
Calvillo gets around 127 mm of rain over 16.2 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 52% and peaks near 62% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 62 | 62 | 62 | 62 | 62 | 62 | 61 | 61 | 60 | 59 | 58 | 57 | 56 | 55 | 54 | 53 | 52 | 51 | 50 | 49 | 48 | 47 | 45 | 44 | 43 | 41 | 40 | 39 | 38 | 37 |
| Rain chance (%) | |
|---|---|
| 1 | 62 |
| 2 | 62 |
| 3 | 62 |
| 4 | 62 |
| 5 | 62 |
| 6 | 62 |
| 7 | 61 |
| 8 | 61 |
| 9 | 60 |
| 10 | 59 |
| 11 | 58 |
| 12 | 57 |
| 13 | 56 |
| 14 | 55 |
| 15 | 54 |
| 16 | 53 |
| 17 | 52 |
| 18 | 51 |
| 19 | 50 |
| 20 | 49 |
| 21 | 48 |
| 22 | 47 |
| 23 | 45 |
| 24 | 44 |
| 25 | 43 |
| 26 | 41 |
| 27 | 40 |
| 28 | 39 |
| 29 | 38 |
| 30 | 37 |
Humidity in September
Most of September feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the comfortable band about 51% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 27 | 28 | 28 | 29 | 30 | 31 | 31 | 32 | 33 | 34 | 35 | 36 | 38 | 39 | 41 | 43 | 45 | 47 | 48 | 50 | 51 |
| Comfortable (%) | 58 | 57 | 57 | 57 | 57 | 57 | 56 | 56 | 55 | 54 | 53 | 53 | 52 | 51 | 50 | 50 | 50 | 49 | 49 | 49 | 48 | 48 | 47 | 46 | 45 | 45 | 44 | 43 | 42 | 42 |
| Humid (%) | 17 | 18 | 18 | 18 | 18 | 18 | 18 | 18 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 18 | 18 | 17 | 16 | 15 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 |
| Dry (%) | Comfortable (%) | Humid (%) | |
|---|---|---|---|
| 1 | 25 | 58 | 17 |
| 2 | 25 | 57 | 18 |
| 3 | 25 | 57 | 18 |
| 4 | 25 | 57 | 18 |
| 5 | 25 | 57 | 18 |
| 6 | 25 | 57 | 18 |
| 7 | 26 | 56 | 18 |
| 8 | 26 | 56 | 18 |
| 9 | 26 | 55 | 19 |
| 10 | 27 | 54 | 19 |
| 11 | 28 | 53 | 19 |
| 12 | 28 | 53 | 19 |
| 13 | 29 | 52 | 19 |
| 14 | 30 | 51 | 19 |
| 15 | 31 | 50 | 19 |
| 16 | 31 | 50 | 19 |
| 17 | 32 | 50 | 18 |
| 18 | 33 | 49 | 18 |
| 19 | 34 | 49 | 17 |
| 20 | 35 | 49 | 16 |
| 21 | 36 | 48 | 15 |
| 22 | 38 | 48 | 15 |
| 23 | 39 | 47 | 14 |
| 24 | 41 | 46 | 13 |
| 25 | 43 | 45 | 12 |
| 26 | 45 | 45 | 11 |
| 27 | 47 | 44 | 10 |
| 28 | 48 | 43 | 9 |
| 29 | 50 | 42 | 8 |
| 30 | 51 | 42 | 7 |
Wind in September
Winds average 6 km/h in September.
Across September, daily wind ranges from about 6 km/h on the calmest days to 6 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 6 | calm |
| 2 | 6 | calm |
| 3 | 6 | calm |
| 4 | 6 | calm |
| 5 | 6 | calm |
| 6 | 6 | calm |
| 7 | 6 | calm |
| 8 | 6 | calm |
| 9 | 6 | calm |
| 10 | 6 | calm |
| 11 | 6 | calm |
| 12 | 6 | calm |
| 13 | 6 | calm |
| 14 | 6 | calm |
| 15 | 6 | calm |
| 16 | 6 | calm |
| 17 | 6 | calm |
| 18 | 6 | calm |
| 19 | 6 | calm |
| 20 | 6 | calm |
| 21 | 6 | calm |
| 22 | 6 | calm |
| 23 | 6 | calm |
| 24 | 6 | calm |
| 25 | 6 | calm |
| 26 | 6 | calm |
| 27 | 6 | calm |
| 28 | 6 | calm |
| 29 | 6 | calm |
| 30 | 6 | calm |
Sunrise & sunset in September
Daylight runs from about 12 h 24 min at the start of September to 11 h 48 min by month's end. The lit band spans sunrise to sunset each day.
Days shrink by about 36 minutes over September. Sunrise moves from 6:37 AM to 6:46 AM, and sunset from 7:04 PM to 6:35 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.4 | 12.4 | 12.4 | 12.4 | 12.4 | 12.3 | 12.3 | 12.3 | 12.3 | 12.3 | 12.2 | 12.2 | 12.2 | 12.2 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 11.9 | 11.9 | 11.9 | 11.9 | 11.8 | 11.8 |
| Sunrise (AM) | 6:37 | 6:38 | 6:38 | 6:38 | 6:38 | 6:39 | 6:39 | 6:39 | 6:40 | 6:40 | 6:40 | 6:40 | 6:41 | 6:41 | 6:41 | 6:41 | 6:42 | 6:42 | 6:42 | 6:43 | 6:43 | 6:43 | 6:43 | 6:44 | 6:44 | 6:44 | 6:45 | 6:45 | 6:45 | 6:46 |
| Sunset (PM) | 7:04 | 7:03 | 7:02 | 7:01 | 7:00 | 6:59 | 6:58 | 6:57 | 6:56 | 6:55 | 6:54 | 6:53 | 6:52 | 6:51 | 6:50 | 6:49 | 6:48 | 6:47 | 6:46 | 6:45 | 6:44 | 6:43 | 6:42 | 6:41 | 6:40 | 6:39 | 6:38 | 6:37 | 6:36 | 6:35 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.4 | 6:37 | 7:04 |
| 2 | 12.4 | 6:38 | 7:03 |
| 3 | 12.4 | 6:38 | 7:02 |
| 4 | 12.4 | 6:38 | 7:01 |
| 5 | 12.4 | 6:38 | 7:00 |
| 6 | 12.3 | 6:39 | 6:59 |
| 7 | 12.3 | 6:39 | 6:58 |
| 8 | 12.3 | 6:39 | 6:57 |
| 9 | 12.3 | 6:40 | 6:56 |
| 10 | 12.3 | 6:40 | 6:55 |
| 11 | 12.2 | 6:40 | 6:54 |
| 12 | 12.2 | 6:40 | 6:53 |
| 13 | 12.2 | 6:41 | 6:52 |
| 14 | 12.2 | 6:41 | 6:51 |
| 15 | 12.1 | 6:41 | 6:50 |
| 16 | 12.1 | 6:41 | 6:49 |
| 17 | 12.1 | 6:42 | 6:48 |
| 18 | 12.1 | 6:42 | 6:47 |
| 19 | 12.1 | 6:42 | 6:46 |
| 20 | 12.0 | 6:43 | 6:45 |
| 21 | 12.0 | 6:43 | 6:44 |
| 22 | 12.0 | 6:43 | 6:43 |
| 23 | 12.0 | 6:43 | 6:42 |
| 24 | 12.0 | 6:44 | 6:41 |
| 25 | 11.9 | 6:44 | 6:40 |
| 26 | 11.9 | 6:44 | 6:39 |
| 27 | 11.9 | 6:45 | 6:38 |
| 28 | 11.9 | 6:45 | 6:37 |
| 29 | 11.8 | 6:45 | 6:36 |
| 30 | 11.8 | 6:46 | 6:35 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 5.64 kWh/m².
For context, solar energy here swings from a low near 4.73 kWh/m² to a high of 7.72 kWh/m² in May across the year — September's 5.64 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.9 | 5.9 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.8 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.7 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.5 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.9 | Bright |
| 2 | 5.9 | Bright |
| 3 | 5.8 | Bright |
| 4 | 5.8 | Bright |
| 5 | 5.8 | Bright |
| 6 | 5.8 | Bright |
| 7 | 5.8 | Bright |
| 8 | 5.8 | Bright |
| 9 | 5.7 | Bright |
| 10 | 5.7 | Bright |
| 11 | 5.7 | Bright |
| 12 | 5.7 | Bright |
| 13 | 5.7 | Bright |
| 14 | 5.7 | Bright |
| 15 | 5.7 | Bright |
| 16 | 5.7 | Bright |
| 17 | 5.7 | Bright |
| 18 | 5.7 | Bright |
| 19 | 5.7 | Bright |
| 20 | 5.6 | Bright |
| 21 | 5.6 | Bright |
| 22 | 5.6 | Bright |
| 23 | 5.6 | Bright |
| 24 | 5.6 | Bright |
| 25 | 5.6 | Bright |
| 26 | 5.6 | Bright |
| 27 | 5.6 | Bright |
| 28 | 5.6 | Bright |
| 29 | 5.6 | Bright |
| 30 | 5.5 | Bright |
Hazard calendar for Calvillo
In September, Calvillo sits inside its rainy season season. The full year is below, with each hazard's peak months called out.
Calvillo's rainy season runs June–September, when most of the year's rain falls.
Is September a good time to visit Calvillo?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Calvillo for sightseeing.
What to pack for Calvillo in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Calvillo sees daytime highs around 25°C and nights near 14°C. Pack rain gear. Worth having: light clothes and sun protection. About 16 days see rain.
UV index in Calvillo in September
Clear-sky midday UV in September peaks around 13 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Calvillo peaks around April 23 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 7 (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) | 7 | 10 | 12 | 14 | 14 | 13 | 13 | 13 | 13 | 10 | 8 | 7 |
| Level | Very high | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | High |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 7 | Very high |
| Feb | 10 | Extreme |
| Mar | 12 | Extreme |
| Apr | 14 | Extreme |
| May | 14 | Extreme |
| Jun | 13 | Extreme |
| Jul | 13 | Extreme |
| Aug | 13 | Extreme |
| Sep | 13 | Extreme |
| Oct | 10 | Extreme |
| Nov | 8 | Very high |
| Dec | 7 | High |
Where is Calvillo?
Calvillo sits at 21.8°N, 102.7°W, 1,629 m above sea level, in Mexico. The nearest listed city is Villa Hidalgo, 23 km away.
Topography around Calvillo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Calvillo.
Within 3 km, the terrain around Calvillo has only modest variations in elevation — a maximum elevation change of 204 m around an average of 1,672 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,306 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,866 m.
The land around Calvillo is covered by shrubs (54%) within 3 km, shrubs (67%) within 16 km, and shrubs (57%) 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 Calvillo (21.8459°, -102.7188°, elevation 1,629 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).