Casa Grande weather in December

In December, Casa Grande sees average daytime highs of 66°F and overnight lows near 43°F, with 0.9 in of rain across 3.6 wet days and about 9.9 hours of daylight. It is the 12th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 69°F in the first days to 65°F by the end. The sky is clear or mostly clear about 59% of the time in December, and the air most often feels dry.

Daylight stretches from about 10 hours at the start of December to 9 h 54 min by month's end. Set against the rest of the year, December is Casa Grande's 10th-clearest and 11th-windiest month. For the whole year in context, see Casa Grande's year-round climate.

Daytime high: 66°; 12th warmest
Overnight low: 43°; 2nd coldest
Rainfall: 0.9 in; 3.6 wet days
Daylight: 9 h 48 min; 7:28 AM – 5:18 PM
Cloud cover: 36%; 10th clearest
Wind: 4 mph; 11th windiest
Solar energy: 3.25 kWh/m²
Travel score: 7.4; out of 10

Casa Grande is city in Pinal County, Arizona, United States.

Density: 180/km²; people per km²
Founded: 1879

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

← November Casa Grande 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

Highs ease over the month, from about 69°F in the first days to 65°F by the end.

A typical December day in Casa Grande reaches about 66°F in the afternoon and slips back to 43°F overnight — a 23°F spread between the day's warmth and the night's chill. On most days the high lands between 57°F and 74°F. Set against its neighbours, December runs about 10°F 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 (°F)	69	69	69	68	68	68	67	67	67	67	66	66	66	66	65	65	65	65	65	65	65	64	64	64	64	64	64	64	65	65	65
Avg low (°F)	46	46	45	45	45	45	44	44	44	44	44	44	44	43	43	43	43	43	43	42	42	42	42	42	42	42	42	42	42	42	42

	Avg high (°F)	Avg low (°F)
1	69	46
2	69	46
3	69	45
4	68	45
5	68	45
6	68	45
7	67	44
8	67	44
9	67	44
10	67	44
11	66	44
12	66	44
13	66	44
14	66	43
15	65	43
16	65	43
17	65	43
18	65	43
19	65	43
20	65	42
21	65	42
22	64	42
23	64	42
24	64	42
25	64	42
26	64	42
27	64	42
28	64	42
29	65	42
30	65	42
31	65	42

How December really feels in Casa Grande

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

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.

Casa Grande weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 4th-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Daylight (hours)	Travel score
Jan	67° / 43°	1.0	3.5	10.1	7.5
Feb	71° / 47°	1.1	3.7	10.8	7.8
Mar	78° / 52°	0.7	2.7	11.8	8.3
Apr	85° / 57°	0.2	1.1	12.8	6.8
May	94° / 65°	0.1	0.6	13.7	3.5
Jun	104° / 74°	0.1	0.5	14.1	0.4
Jul	105° / 81°	0.8	3.9	13.9	0.0
Aug	103° / 81°	1.1	4.3	13.2	0.2
Sep	99° / 74°	0.9	3.1	12.2	1.8
Oct	89° / 63°	0.5	2.1	11.2	5.5
Nov	76° / 51°	0.5	1.8	10.3	8.6
Dec	66° / 43°	0.9	3.6	9.9	7.4

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 59% 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 29%.

	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 (%)	71	71	71	71	71	71	71	71	71	71	71	72	73	73	73	73	73	74	74	73	72	72	72	71	71	70	70	70	69	69	69
Cloudier (%)	29	29	29	29	29	29	29	29	29	29	29	28	27	27	27	27	27	26	26	27	28	28	28	29	29	30	30	30	31	31	31

	Clearer (%)	Cloudier (%)
1	71	29
2	71	29
3	71	29
4	71	29
5	71	29
6	71	29
7	71	29
8	71	29
9	71	29
10	71	29
11	71	29
12	72	28
13	73	27
14	73	27
15	73	27
16	73	27
17	73	27
18	74	26
19	74	26
20	73	27
21	72	28
22	72	28
23	72	28
24	71	29
25	71	29
26	70	30
27	70	30
28	70	30
29	69	31
30	69	31
31	69	31

Chance of precipitation in December

Any precipitation

Casa Grande gets around 0.9 in of rain over 3.6 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 11% and peaks near 13% 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 (%)	10	10	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	11	12	12	12	12	12	12	12	12	13	13	13	13

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

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 (%)	99	99	99	99	99	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

Wind in December

Winds average 4 mph in December.

Across December, daily wind ranges from about 4 mph on the calmest days to 4 mph 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 (mph)	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4
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 (mph)	Feels
1	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	calm
22	4	calm
23	4	calm
24	4	calm
25	4	calm
26	4	calm
27	4	calm
28	4	calm
29	4	calm
30	4	calm
31	4	calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 10 hours at the start of December to 9 h 54 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 7:17 AM to 7:34 AM, and sunset from 5:16 PM to 5:26 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)	10.0	10.0	10.0	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.9	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.8	9.9	9.9
Sunrise (AM)	7:17	7:18	7:19	7:20	7:20	7:21	7:22	7:23	7:23	7:24	7:25	7:25	7:26	7:27	7:27	7:28	7:28	7:29	7:30	7:30	7:31	7:31	7:32	7:32	7:32	7:33	7:33	7:34	7:34	7:34	7:34
Sunset (PM)	5:16	5:16	5:16	5:16	5:16	5:16	5:17	5:17	5:17	5:17	5:17	5:17	5:18	5:18	5:18	5:18	5:19	5:19	5:20	5:20	5:20	5:21	5:21	5:22	5:22	5:23	5:24	5:24	5:25	5:25	5:26

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	10.0	7:17	5:16
2	10.0	7:18	5:16
3	10.0	7:19	5:16
4	9.9	7:20	5:16
5	9.9	7:20	5:16
6	9.9	7:21	5:16
7	9.9	7:22	5:17
8	9.9	7:23	5:17
9	9.9	7:23	5:17
10	9.9	7:24	5:17
11	9.9	7:25	5:17
12	9.9	7:25	5:17
13	9.9	7:26	5:18
14	9.9	7:27	5:18
15	9.8	7:27	5:18
16	9.8	7:28	5:18
17	9.8	7:28	5:19
18	9.8	7:29	5:19
19	9.8	7:30	5:20
20	9.8	7:30	5:20
21	9.8	7:31	5:20
22	9.8	7:31	5:21
23	9.8	7:32	5:21
24	9.8	7:32	5:22
25	9.8	7:32	5:22
26	9.8	7:33	5:23
27	9.8	7:33	5:24
28	9.8	7:34	5:24
29	9.8	7:34	5:25
30	9.9	7:34	5:25
31	9.9	7:34	5:26

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 3.25 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 3.25 kWh/m² to a high of 8.47 kWh/m² in June across the year — December's 3.25 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)	3.4	3.4	3.4	3.3	3.3	3.3	3.3	3.3	3.2	3.2	3.2	3.2	3.2	3.2	3.2	3.2	3.2	3.2	3.2	3.2	3.2	3.2	3.2	3.2	3.3	3.3	3.3	3.3	3.3	3.3	3.3
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	3.4	Moderate
2	3.4	Moderate
3	3.4	Moderate
4	3.3	Moderate
5	3.3	Moderate
6	3.3	Moderate
7	3.3	Moderate
8	3.3	Moderate
9	3.2	Moderate
10	3.2	Moderate
11	3.2	Moderate
12	3.2	Moderate
13	3.2	Moderate
14	3.2	Moderate
15	3.2	Moderate
16	3.2	Moderate
17	3.2	Moderate
18	3.2	Moderate
19	3.2	Moderate
20	3.2	Moderate
21	3.2	Moderate
22	3.2	Moderate
23	3.2	Moderate
24	3.2	Moderate
25	3.3	Moderate
26	3.3	Moderate
27	3.3	Moderate
28	3.3	Moderate
29	3.3	Moderate
30	3.3	Moderate
31	3.3	Moderate

Planning a trip in December

Is December a good time to visit Casa Grande?

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

7.4

Sightseeing

5th-best month of the year

3.2

Beach & pool

10th-best month of the year

December is one of the better times to visit Casa Grande for general sightseeing.

What to pack for Casa Grande in December

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

In December, Casa Grande sees daytime highs around 66°F and nights near 43°F. Worth packing: a warm layer. About 4 days see rain.

a warm layer

UV index in Casa Grande in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Casa Grande peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 at about 3 (moderate).

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)	4	5	5	8	9	11	11	11	9	7	5	3
Level	Moderate	Moderate	Moderate	Very high	Very high	Extreme	Extreme	Extreme	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	4	Moderate
Feb	5	Moderate
Mar	5	Moderate
Apr	8	Very high
May	9	Very high
Jun	11	Extreme
Jul	11	Extreme
Aug	11	Extreme
Sep	9	Very high
Oct	7	High
Nov	5	Moderate
Dec	3	Moderate

Air quality in Casa Grande 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 Casa Grande is worst in June — around 28 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 12 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)	13	13	14	14	14	28	14	13	13	12	13	13
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	13	Moderate
Feb	13	Moderate
Mar	14	Moderate
Apr	14	Moderate
May	14	Moderate
Jun	28	Moderate
Jul	14	Moderate
Aug	13	Moderate
Sep	13	Moderate
Oct	12	Moderate
Nov	13	Moderate
Dec	13	Moderate

Location & terrain

Where is Casa Grande?

Casa Grande sits at 32.9°N, 111.8°W, 1,398 ft above sea level, in United States. The nearest listed city is Eloy, 14 mi away.

Topography around Casa Grande

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Casa Grande.

Within 2 miles, the terrain around Casa Grande has only modest variations in elevation — a maximum elevation change of 102 ft around an average of 1,398 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,182 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,928 ft.

The land around Casa Grande is covered by bare terrain (44%) and artificial surfaces (38%) within 2 miles, bare terrain (43%) and shrubs (25%) within 10 miles, and shrubs (59%) and bare terrain (20%) within 50 miles.

2 miles

102 ft

bare terrain 44%

10 miles

2,182 ft

bare terrain 43%

50 miles

4,928 ft

shrubs 59%

treesshrubsgrasslandcroplandartificial surfacesbare terrain

← November Casa Grande year-round climate January →Best places to visit in December

December weather nearby: Eloy 14 mi · Maricopa 21 mi · Florence 24 mi · San Tan Valley 25 mi · Queen Creek 27 mi · Chandler 30 mi · Gilbert 33 mi · Ahwatukee Foothills 35 mi

United States travel facts

Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 100% of US; price level, 2025
GDP per capita: $90,027; 2025
Happiness: 6.8 / 10; World Happiness, 2025
Safe drinking water: 98%; of population, 2024
Homicide rate: 5.8; per 100k, 2023
Road deaths: 12.7; per 100k/yr, 2019
Income group: High; World Bank
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 Casa Grande (32.8795°, -111.7574°, elevation 1,398 ft), 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 (°F)	Avg low (°F)
1	69	46
2	69	46
3	69	45
4	68	45
5	68	45
6	68	45
7	67	44
8	67	44
9	67	44
10	67	44
11	66	44
12	66	44
13	66	44
14	66	43
15	65	43
16	65	43
17	65	43
18	65	43
19	65	43
20	65	42
21	65	42
22	64	42
23	64	42
24	64	42
25	64	42
26	64	42
27	64	42
28	64	42
29	65	42
30	65	42
31	65	42

	Clearer (%)	Cloudier (%)
1	71	29
2	71	29
3	71	29
4	71	29
5	71	29
6	71	29
7	71	29
8	71	29
9	71	29
10	71	29
11	71	29
12	72	28
13	73	27
14	73	27
15	73	27
16	73	27
17	73	27
18	74	26
19	74	26
20	73	27
21	72	28
22	72	28
23	72	28
24	71	29
25	71	29
26	70	30
27	70	30
28	70	30
29	69	31
30	69	31
31	69	31

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°F)	Avg low (°F)
1	69	46
2	69	46
3	69	45
4	68	45
5	68	45
6	68	45
7	67	44
8	67	44
9	67	44
10	67	44
11	66	44
12	66	44
13	66	44
14	66	43
15	65	43
16	65	43
17	65	43
18	65	43
19	65	43
20	65	42
21	65	42
22	64	42
23	64	42
24	64	42
25	64	42
26	64	42
27	64	42
28	64	42
29	65	42
30	65	42
31	65	42

	Clearer (%)	Cloudier (%)
1	71	29
2	71	29
3	71	29
4	71	29
5	71	29
6	71	29
7	71	29
8	71	29
9	71	29
10	71	29
11	71	29
12	72	28
13	73	27
14	73	27
15	73	27
16	73	27
17	73	27
18	74	26
19	74	26
20	73	27
21	72	28
22	72	28
23	72	28
24	71	29
25	71	29
26	70	30
27	70	30
28	70	30
29	69	31
30	69	31
31	69	31

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°F)	Avg low (°F)
1	69	46
2	69	46
3	69	45
4	68	45
5	68	45
6	68	45
7	67	44
8	67	44
9	67	44
10	67	44
11	66	44
12	66	44
13	66	44
14	66	43
15	65	43
16	65	43
17	65	43
18	65	43
19	65	43
20	65	42
21	65	42
22	64	42
23	64	42
24	64	42
25	64	42
26	64	42
27	64	42
28	64	42
29	65	42
30	65	42
31	65	42

	Clearer (%)	Cloudier (%)
1	71	29
2	71	29
3	71	29
4	71	29
5	71	29
6	71	29
7	71	29
8	71	29
9	71	29
10	71	29
11	71	29
12	72	28
13	73	27
14	73	27
15	73	27
16	73	27
17	73	27
18	74	26
19	74	26
20	73	27
21	72	28
22	72	28
23	72	28
24	71	29
25	71	29
26	70	30
27	70	30
28	70	30
29	69	31
30	69	31
31	69	31

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0