Azusa weather in December

In December, Azusa sees average daytime highs of 59°F and overnight lows near 42°F, with 2.4 in of precipitation across 5.2 wet days and about 9.8 hours of daylight. It is the 12th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 61°F in the first days to 58°F by the end. The sky is clear or mostly clear about 52% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 54 min at the start of December to 9 h 48 min by month's end. Set against the rest of the year, December is Azusa's 9th-clearest and 1st-windiest month. For the whole year in context, see Azusa's year-round climate.

Daytime high
59°
12th warmest
Overnight low
42°
1st coldest
Precipitation
2.4 in
5.2 wet days
Daylight
9 h 42 min
6:56 AM – 4:40 PM
Cloud cover
42%
9th clearest
Wind
4 mph
1st windiest
Solar energy
2.96 kWh/m²
Travel score
5.3
out of 10

Azusa is city in Los Angeles County, California, United States.

Density
1,984/km²
people per km²
Founded
1887

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 61°F in the first days to 58°F by the end.

A typical December day in Azusa reaches about 59°F in the afternoon and slips back to 42°F overnight — a 17°F spread between the day's warmth and the night's chill. On most days the high lands between 49°F and 69°F. Set against its neighbours, December runs about 7°F cooler than November and on par with January.

30°40°50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
16244
26144
36144
46143
56043
66043
76043
86043
96043
105942
115942
125942
135942
145942
155942
165842
175842
185841
195841
205841
215841
225841
235841
245841
255841
265841
275841
285841
295841
305841
315841

Azusa 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.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan59° / 42°3.55.91.1105.3
Feb60° / 43°3.86.91.510.75.2
Mar63° / 45°2.56.7111.76.3
Apr68° / 47°1.040.312.87.6
May73° / 53°0.53013.88.5
Jun81° / 58°0.10.7014.28.5
Jul86° / 64°0.42.10146.4
Aug88° / 65°0.21.9013.36.0
Sep84° / 61°0.31.8012.27.5
Oct76° / 55°0.82.6011.18.7
Nov66° / 47°0.92.90.210.27.6
Dec59° / 42°2.45.20.79.85.3

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 52% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 12% of December, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
16931
26832
36733
46634
56634
66535
76535
86535
96436
106436
116436
126436
136436
146436
156535
166535
176535
186535
196436
206436
216436
226436
236436
246337
256337
266238
276238
286238
296040
306040
315941

Chance of precipitation in December

Any precipitationSnow

Azusa gets around 2.4 in of rain and snow over 5.2 wet days in December. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 17% and peaks near 18% on the wettest days, and about 1 day brings snow.

0%10%20%30%151015202531
Rain chance (%)Snow chance (%)
1151
2151
3151
4161
5161
6161
7171
8171
9172
10172
11172
12172
13172
14172
15172
16172
17173
18173
19173
20173
21173
22173
23173
24173
25174
26174
27174
28174
29174
30184
31184

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.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in December

Winds average 4 mph in December, the windiest month of the year.

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.

0246810151015202531
Wind speed (mph)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 54 min at the start of December to 9 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 6:45 AM to 7:02 AM, and sunset from 4:38 PM to 4:47 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.96:454:38
29.96:464:38
39.96:464:38
49.86:474:38
59.86:484:38
69.86:494:38
79.86:504:38
89.86:504:38
99.86:514:38
109.86:524:38
119.86:524:39
129.86:534:39
139.86:544:39
149.76:544:39
159.76:554:40
169.76:564:40
179.76:564:40
189.76:574:41
199.76:574:41
209.76:584:41
219.76:584:42
229.76:594:42
239.76:594:43
249.77:004:43
259.77:004:44
269.77:014:44
279.77:014:45
289.77:014:45
299.77:024:46
309.77:024:47
319.87:024:47

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.96 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.96 kWh/m² to a high of 8.18 kWh/m² in June across the year — December's 2.96 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.1Moderate
23.1Moderate
33.0Moderate
43.0Moderate
53.0Moderate
63.0Moderate
73.0Moderate
82.9Moderate
92.9Moderate
102.9Moderate
112.9Moderate
122.9Moderate
132.9Moderate
142.9Moderate
152.9Moderate
162.9Moderate
172.9Moderate
182.9Moderate
192.9Moderate
202.9Moderate
212.9Moderate
222.9Moderate
232.9Moderate
242.9Moderate
252.9Moderate
263.0Moderate
273.0Moderate
283.0Moderate
293.0Moderate
303.0Moderate
313.0Moderate
Planning a trip in December

Is December a good time to visit Azusa?

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

5.3
Sightseeing
10th-best month of the year
0.2
Beach & pool
11th-best month of the year

December is a reasonable time to visit Azusa for sightseeing.

What to pack for Azusa in December

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

In December, Azusa sees daytime highs around 59°F and nights near 42°F. Worth packing: a warm layer. About 5 days see rain.

a warm layer

Sea temperature near Azusa in December

The nearest coast averages about 60°F in December — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 32 mi away) is warmest in August at about 68°F and coldest in February near 59°F.

It's comfortable for a long swim from Aug 4 to Sep 13 — about 1.3 months when the water holds above 68°F.

60°65°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan59Bracing
Feb59Bracing
Mar59Bracing
Apr59Cool
May62Cool
Jun65Cool
Jul67Cool
Aug68Refreshing
Sep68Refreshing
Oct66Cool
Nov63Cool
Dec60Cool

UV index in Azusa in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Azusa peaks around July 11 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highHighModerateJul 11UV 11Dec 16UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Azusa 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 Azusa is worst in September — around 39 µg/m³ PM2.5 (poor), about 3.2× the cleanest month (May, 12 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateSep 1537 µg/m³May 1612 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb15Moderate
Mar16Moderate
Apr14Moderate
May12Moderate
Jun15Moderate
Jul18Moderate
Aug22Moderate
Sep39Poor
Oct15Moderate
Nov17Moderate
Dec14Moderate
Location & terrain

Where is Azusa?

Azusa sits at 34.1°N, 117.9°W, 610 ft above sea level, in United States. The nearest listed city is Glendora, 2.5 mi away.

Topography around Azusa

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

Within 2 miles, the terrain around Azusa has significant variations in elevation — a maximum elevation change of 1,759 ft around an average of 673 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,164 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,013 ft.

The land around Azusa is covered by artificial surfaces (65%) within 2 miles, artificial surfaces (44%), shrubs (26%) and trees (23%) within 10 miles, and artificial surfaces (26%) and grassland (20%) within 50 miles.

2 miles
1,759 ft
10 miles
5,164 ft
50 miles
10,013 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Glendora 2.5 mi · Covina 3.1 mi · Duarte 3.7 mi · Baldwin Park 4.3 mi · West Covina 5.0 mi · Monrovia 5.6 mi · San Dimas 6.2 mi · Valinda 6.2 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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Azusa (34.1336°, -117.9076°, elevation 610 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. 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).