Valle de Santiago weather in December

In December, Valle de Santiago sees average daytime highs of 25°C and overnight lows near 9°C, with 4 mm of rain across 1.1 wet days and about 10.8 hours of daylight. It is the 11th-warmest and 12th-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 57% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 h 54 min at the start of December to 10 h 48 min by month's end. Set against the rest of the year, December is Valle de Santiago's 4th-clearest and 11th-windiest month. For the whole year in context, see Valle de Santiago's year-round climate.

Daytime high: 25°; 11th warmest
Overnight low: 9°; 2nd coldest
Rainfall: 4 mm; 1.1 wet days
Daylight: 10 h 48 min; 7:18 AM – 6:04 PM
Cloud cover: 39%; 4th clearest
Wind: 6 km/h; 11th windiest
Solar energy: 4.83 kWh/m²
Travel score: 8.7; out of 10

Valle de Santiago is municipal seat of Valle de Santiago, State of Guanajuato, Mexico.

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

← November Valle de Santiago year-round climate January →Best places to visit in December

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 25°C through the month.

A typical December day in Valle de Santiago reaches about 25°C in the afternoon and slips back to 9°C overnight — a 16°C spread between the day's warmth and the night's chill. On most days the high lands between 22°C and 28°C. Set against its neighbours, December runs about 1°C cooler than November and on par with January.

	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	31
Avg high (°C)	26	26	26	26	26	26	26	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	25	24	24	24	24	24	24	24	24
Avg low (°C)	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	8	8	8	8	8	8	8	8	8	8	8

	Avg high (°C)	Avg low (°C)
1	26	9
2	26	9
3	26	9
4	26	9
5	26	9
6	26	9
7	26	9
8	25	9
9	25	9
10	25	9
11	25	9
12	25	9
13	25	9
14	25	9
15	25	9
16	25	9
17	25	9
18	25	9
19	25	9
20	25	9
21	25	8
22	25	8
23	25	8
24	24	8
25	24	8
26	24	8
27	24	8
28	24	8
29	24	8
30	24	8
31	24	8

How December really feels in Valle de Santiago

Once humidity and wind are folded in, December averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

December sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Valle de Santiago weather by month

How December compares with the rest of the year at a glance. December is the 11th-warmest and 12th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	25° / 8°	10	1.9	10.9	8.6
Feb	27° / 10°	12	2.1	11.3	8.2
Mar	29° / 12°	11	1.8	11.9	6.9
Apr	31° / 14°	9	2.2	12.5	5.3
May	32° / 16°	37	6.3	13	4.4
Jun	30° / 17°	135	14.7	13.2	4.4
Jul	28° / 16°	170	20.3	13.1	4.9
Aug	28° / 16°	146	18	12.7	5.2
Sep	27° / 15°	122	16	12.1	5.5
Oct	27° / 14°	39	6.9	11.5	7.0
Nov	26° / 11°	13	2.5	11	8.2
Dec	25° / 9°	4	1.1	10.8	8.7

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 57% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 13% of December, with mostly cloudy or overcast conditions the remaining 30%. Skies tend to cloud over 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	31
Clearer (%)	79	78	78	77	76	75	75	74	74	73	72	71	71	70	70	70	69	68	67	67	67	66	65	64	64	64	64	64	64	64	64
Cloudier (%)	21	22	22	23	24	25	25	26	26	27	28	29	29	30	30	30	31	32	33	33	33	34	35	36	36	36	36	36	36	36	36

	Clearer (%)	Cloudier (%)
1	79	21
2	78	22
3	78	22
4	77	23
5	76	24
6	75	25
7	75	25
8	74	26
9	74	26
10	73	27
11	72	28
12	71	29
13	71	29
14	70	30
15	70	30
16	70	30
17	69	31
18	68	32
19	67	33
20	67	33
21	67	33
22	66	34
23	65	35
24	64	36
25	64	36
26	64	36
27	64	36
28	64	36
29	64	36
30	64	36
31	64	36

Chance of precipitation in December

Any precipitation

Valle de Santiago gets around 4 mm of rain over 1.1 wet days in December, the driest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 3% and peaks near 4% on the wettest days.

	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	31
Rain chance (%)	3	3	2	2	2	2	2	2	2	3	3	3	3	3	3	3	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4

	Rain chance (%)
1	3
2	3
3	2
4	2
5	2
6	2
7	2
8	2
9	2
10	3
11	3
12	3
13	3
14	3
15	3
16	3
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	4
30	4
31	4

Humidity in December

DryComfortableHumidMuggyOppressiveMiserable

Most of December feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, December lands in the dry band about 100% 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	31
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

Wind in December

Winds average 6 km/h in December.

Across December, daily wind ranges from about 6 km/h on the calmest days to 7 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	31
Wind speed (km/h)	7	7	7	7	7	7	7	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	calm

	Wind speed (km/h)	Feels
1	7	calm
2	7	calm
3	7	calm
4	7	calm
5	7	calm
6	7	calm
7	7	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
31	6	calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 h 54 min at the start of December to 10 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over December. Sunrise moves from 7:09 AM to 7:25 AM, and sunset from 6:00 PM to 6:11 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	31
Daylight (h)	10.9	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8	10.8
Sunrise (AM)	7:09	7:10	7:10	7:11	7:11	7:12	7:13	7:13	7:14	7:14	7:15	7:16	7:16	7:17	7:17	7:18	7:18	7:19	7:19	7:20	7:20	7:21	7:21	7:22	7:22	7:23	7:23	7:23	7:24	7:24	7:25
Sunset (PM)	6:00	6:00	6:00	6:01	6:01	6:01	6:01	6:01	6:02	6:02	6:02	6:03	6:03	6:03	6:04	6:04	6:04	6:05	6:05	6:06	6:06	6:07	6:07	6:08	6:08	6:09	6:09	6:10	6:10	6:11	6:11

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	10.9	7:09	6:00
2	10.8	7:10	6:00
3	10.8	7:10	6:00
4	10.8	7:11	6:01
5	10.8	7:11	6:01
6	10.8	7:12	6:01
7	10.8	7:13	6:01
8	10.8	7:13	6:01
9	10.8	7:14	6:02
10	10.8	7:14	6:02
11	10.8	7:15	6:02
12	10.8	7:16	6:03
13	10.8	7:16	6:03
14	10.8	7:17	6:03
15	10.8	7:17	6:04
16	10.8	7:18	6:04
17	10.8	7:18	6:04
18	10.8	7:19	6:05
19	10.8	7:19	6:05
20	10.8	7:20	6:06
21	10.8	7:20	6:06
22	10.8	7:21	6:07
23	10.8	7:21	6:07
24	10.8	7:22	6:08
25	10.8	7:22	6:08
26	10.8	7:23	6:09
27	10.8	7:23	6:09
28	10.8	7:23	6:10
29	10.8	7:24	6:10
30	10.8	7:24	6:11
31	10.8	7:25	6:11

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 4.83 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 4.83 kWh/m² to a high of 7.47 kWh/m² in April across the year — December's 4.83 kWh/m² sits near the bottom.

	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	31
Solar energy (kWh/m²)	5.0	4.9	4.9	4.9	4.9	4.9	4.9	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8
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	Bright

	Solar energy (kWh/m²)	Level
1	5.0	Bright
2	4.9	Bright
3	4.9	Bright
4	4.9	Bright
5	4.9	Bright
6	4.9	Bright
7	4.9	Bright
8	4.8	Bright
9	4.8	Bright
10	4.8	Bright
11	4.8	Bright
12	4.8	Bright
13	4.8	Bright
14	4.8	Bright
15	4.8	Bright
16	4.8	Bright
17	4.8	Bright
18	4.8	Bright
19	4.8	Bright
20	4.8	Bright
21	4.8	Bright
22	4.8	Bright
23	4.8	Bright
24	4.8	Bright
25	4.8	Bright
26	4.8	Bright
27	4.8	Bright
28	4.8	Bright
29	4.8	Bright
30	4.8	Bright
31	4.8	Bright

Planning a trip in December

Hazard calendar for Valle de Santiago

In seasonPeak

None of Valle de Santiago's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Valle de Santiago's rainy season runs June–September, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is December a good time to visit Valle de Santiago?

Our two travel scores rate December for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

8.7

Sightseeing

1st-best month of the year

7.8

Beach & pool

5th-best month of the year

December is one of the better times to visit Valle de Santiago for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Valle de Santiago in December

From December's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In December, Valle de Santiago sees daytime highs around 25°C and nights near 9°C. Worth packing: light clothes and sun protection.

light clothessun protection

UV index in Valle de Santiago in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Valle de Santiago peaks around June 14 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 7 (very 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)	8	10	13	13	13	14	12	13	11	10	8	7
Level	Very high	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high

	UV index (midday)	Level
Jan	8	Very high
Feb	10	Extreme
Mar	13	Extreme
Apr	13	Extreme
May	13	Extreme
Jun	14	Extreme
Jul	12	Extreme
Aug	13	Extreme
Sep	11	Extreme
Oct	10	Extreme
Nov	8	Very high
Dec	7	Very high

Air quality in Valle de Santiago in December

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where December falls, not just the annual average.

Air quality in Valle de Santiago is worst in May — around 27 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	24	23	20	24	27	18	21	18	19	17	21	26
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	24	Moderate
Feb	23	Moderate
Mar	20	Moderate
Apr	24	Moderate
May	27	Moderate
Jun	18	Moderate
Jul	21	Moderate
Aug	18	Moderate
Sep	19	Moderate
Oct	17	Moderate
Nov	21	Moderate
Dec	26	Moderate

Location & terrain

Where is Valle de Santiago?

Valle de Santiago sits at 20.4°N, 101.2°W, 1,792 m above sea level, in Mexico. The nearest listed city is Jaral del Progreso, 13 km away.

Topography around Valle de Santiago

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

Within 3 km, the terrain around Valle de Santiago has only modest variations in elevation — a maximum elevation change of 162 m around an average of 1,746 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 763 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,584 m.

The land around Valle de Santiago is covered by cropland (40%) and artificial surfaces (34%) within 3 km, cropland (51%) within 16 km, and cropland (37%) and shrubs (23%) within 80 km.

3 km

162 m

cropland 40%

16 km

763 m

cropland 51%

80 km

1,584 m

cropland 37%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

← November Valle de Santiago year-round climate January →Best places to visit in December

December weather nearby: Jaral del Progreso 13 km · Salamanca 20 km · Yuriria 21 km · Villagrán 24 km · Cortazar 26 km · Uriangato 28 km · Moroleón 29 km · Juventino Rosas 35 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 Valle de Santiago (20.3915°, -101.191°, elevation 1,792 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. 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).

	Avg high (°C)	Avg low (°C)
1	26	9
2	26	9
3	26	9
4	26	9
5	26	9
6	26	9
7	26	9
8	25	9
9	25	9
10	25	9
11	25	9
12	25	9
13	25	9
14	25	9
15	25	9
16	25	9
17	25	9
18	25	9
19	25	9
20	25	9
21	25	8
22	25	8
23	25	8
24	24	8
25	24	8
26	24	8
27	24	8
28	24	8
29	24	8
30	24	8
31	24	8

	Clearer (%)	Cloudier (%)
1	79	21
2	78	22
3	78	22
4	77	23
5	76	24
6	75	25
7	75	25
8	74	26
9	74	26
10	73	27
11	72	28
12	71	29
13	71	29
14	70	30
15	70	30
16	70	30
17	69	31
18	68	32
19	67	33
20	67	33
21	67	33
22	66	34
23	65	35
24	64	36
25	64	36
26	64	36
27	64	36
28	64	36
29	64	36
30	64	36
31	64	36

	Rain chance (%)
1	3
2	3
3	2
4	2
5	2
6	2
7	2
8	2
9	2
10	3
11	3
12	3
13	3
14	3
15	3
16	3
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	4
30	4
31	4

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°C)	Avg low (°C)
1	26	9
2	26	9
3	26	9
4	26	9
5	26	9
6	26	9
7	26	9
8	25	9
9	25	9
10	25	9
11	25	9
12	25	9
13	25	9
14	25	9
15	25	9
16	25	9
17	25	9
18	25	9
19	25	9
20	25	9
21	25	8
22	25	8
23	25	8
24	24	8
25	24	8
26	24	8
27	24	8
28	24	8
29	24	8
30	24	8
31	24	8

	Clearer (%)	Cloudier (%)
1	79	21
2	78	22
3	78	22
4	77	23
5	76	24
6	75	25
7	75	25
8	74	26
9	74	26
10	73	27
11	72	28
12	71	29
13	71	29
14	70	30
15	70	30
16	70	30
17	69	31
18	68	32
19	67	33
20	67	33
21	67	33
22	66	34
23	65	35
24	64	36
25	64	36
26	64	36
27	64	36
28	64	36
29	64	36
30	64	36
31	64	36

	Rain chance (%)
1	3
2	3
3	2
4	2
5	2
6	2
7	2
8	2
9	2
10	3
11	3
12	3
13	3
14	3
15	3
16	3
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	4
30	4
31	4

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°C)	Avg low (°C)
1	26	9
2	26	9
3	26	9
4	26	9
5	26	9
6	26	9
7	26	9
8	25	9
9	25	9
10	25	9
11	25	9
12	25	9
13	25	9
14	25	9
15	25	9
16	25	9
17	25	9
18	25	9
19	25	9
20	25	9
21	25	8
22	25	8
23	25	8
24	24	8
25	24	8
26	24	8
27	24	8
28	24	8
29	24	8
30	24	8
31	24	8

	Clearer (%)	Cloudier (%)
1	79	21
2	78	22
3	78	22
4	77	23
5	76	24
6	75	25
7	75	25
8	74	26
9	74	26
10	73	27
11	72	28
12	71	29
13	71	29
14	70	30
15	70	30
16	70	30
17	69	31
18	68	32
19	67	33
20	67	33
21	67	33
22	66	34
23	65	35
24	64	36
25	64	36
26	64	36
27	64	36
28	64	36
29	64	36
30	64	36
31	64	36

	Rain chance (%)
1	3
2	3
3	2
4	2
5	2
6	2
7	2
8	2
9	2
10	3
11	3
12	3
13	3
14	3
15	3
16	3
17	4
18	4
19	4
20	4
21	4
22	4
23	4
24	4
25	4
26	4
27	4
28	4
29	4
30	4
31	4

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100