Fillmore weather in December

In December, Fillmore sees average daytime highs of 58°F and overnight lows near 40°F, with 2.2 in of precipitation across 5 wet days and about 9.7 hours of daylight. It is the 12th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 60°F in the first days to 57°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 42 min by month's end. Set against the rest of the year, December is Fillmore's 9th-clearest and 1st-windiest month. For the whole year in context, see Fillmore's year-round climate.

Daytime high
58°
12th warmest
Overnight low
40°
1st coldest
Precipitation
2.2 in
5 wet days
Daylight
9 h 42 min
7:00 AM – 4:43 PM
Cloud cover
43%
9th clearest
Wind
4 mph
1st windiest
Solar energy
2.97 kWh/m²
Travel score
5.1
out of 10

Fillmore is city in Ventura County, California, United States.

Density
1,784/km²
people per km²
Founded
1914

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 60°F in the first days to 57°F by the end.

A typical December day in Fillmore reaches about 58°F in the afternoon and slips back to 40°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 49°F and 68°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)
16142
26042
36042
46041
56041
66041
75941
85941
95941
105941
115940
125840
135840
145840
155840
165840
175840
185840
195840
205839
215839
225839
235739
245739
255739
265739
275739
285739
295740
305840
315840

Fillmore 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
Jan58° / 40°3.35.81.8105.0
Feb59° / 40°3.671.910.74.9
Mar62° / 42°2.76.21.411.76.1
Apr67° / 45°1.03.70.712.87.5
May72° / 51°0.62.8013.88.4
Jun79° / 57°0.10.7014.39.0
Jul84° / 62°0.21014.17.6
Aug85° / 63°0.00.2013.37.4
Sep81° / 59°0.20.9012.28.5
Oct74° / 52°0.72.8011.18.7
Nov65° / 45°0.82.90.310.27.3
Dec58° / 40°2.251.19.75.1

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 (%)
17030
27030
36931
46931
56931
66832
76832
86634
96634
106634
116634
126634
136535
146535
156535
166535
176436
186337
196337
206337
216337
226337
236238
246139
256040
266040
275941
285842
295842
305743
315743

Chance of precipitation in December

Any precipitationSnow

Fillmore gets around 2.2 in of rain and snow over 5 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 16% and peaks near 18% on the wettest days, and about 1 day brings snow.

0%10%20%30%151015202531
Rain chance (%)Snow chance (%)
1122
2132
3132
4142
5142
6142
7152
8152
9152
10162
11162
12163
13163
14163
15173
16173
17174
18174
19174
20174
21175
22175
23175
24175
25185
26186
27186
28186
29186
30186
31186

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 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 6:49 AM to 7:07 AM, and sunset from 4:41 PM to 4:51 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.96:494:41
29.96:504:41
39.86:514:41
49.86:524:41
59.86:534:41
69.86:544:41
79.86:544:41
89.86:554:41
99.86:564:42
109.86:574:42
119.76:574:42
129.76:584:42
139.76:594:42
149.76:594:43
159.77:004:43
169.77:004:43
179.77:014:44
189.77:024:44
199.77:024:44
209.77:034:45
219.77:034:45
229.77:044:46
239.77:044:46
249.77:054:47
259.77:054:47
269.77:054:48
279.77:064:48
289.77:064:49
299.77:064:49
309.77:074:50
319.77:074:51

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.97 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.97 kWh/m² to a high of 8.34 kWh/m² in June across the year — December's 2.97 kWh/m² sits near the bottom.

01234151015202531
Solar energy (kWh/m²)Level
13.1Moderate
23.1Moderate
33.1Moderate
43.0Moderate
53.0Moderate
63.0Moderate
73.0Moderate
83.0Moderate
93.0Moderate
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
253.0Moderate
263.0Moderate
273.0Moderate
283.0Moderate
293.0Moderate
303.0Moderate
313.0Moderate
Planning a trip in December

Is December a good time to visit Fillmore?

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

5.1
Sightseeing
10th-best month of the year
0.2
Beach & pool
10th-best month of the year

December is a reasonable time to visit Fillmore for sightseeing.

What to pack for Fillmore in December

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

In December, Fillmore sees daytime highs around 58°F and nights near 40°F. Worth packing: a warm layer. About 5 days see rain.

a warm layer

Sea temperature near Fillmore 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 22 mi away) is warmest in August at about 67°F and coldest in March near 58°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

55°60°65°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan58Bracing
Feb58Bracing
Mar58Bracing
Apr58Bracing
May60Cool
Jun63Cool
Jul66Cool
Aug67Cool
Sep67Cool
Oct65Cool
Nov62Cool
Dec60Cool

UV index in Fillmore 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 Fillmore peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 3 (moderate).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 11Dec 15UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Fillmore 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 Fillmore is worst in December — around 78 µg/m³ PM2.5 (unhealthy), about 12.6× the cleanest month (January, 6 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateUnhealthyDec 1670 µg/m³Jan 246 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb7Good
Mar8Good
Apr7Good
May7Good
Jun7Good
Jul11Good
Aug12Good
Sep11Good
Oct8Good
Nov14Moderate
Dec78Unhealthy
Location & terrain

Where is Fillmore?

Fillmore sits at 34.4°N, 118.9°W, 456 ft above sea level, in United States. The nearest listed city is Moorpark, 8.1 mi away.

Topography around Fillmore

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

Within 2 miles, the terrain around Fillmore has significant variations in elevation — a maximum elevation change of 1,506 ft around an average of 597 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,476 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 8,796 ft.

The land around Fillmore is covered by trees (30%) and grassland (22%) within 2 miles, trees (38%) and grassland (34%) within 10 miles, and grassland (29%), water (26%) and trees (20%) within 50 miles.

2 miles
1,506 ft
10 miles
5,476 ft
50 miles
8,796 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Moorpark 8.1 mi · Santa Paula 8.7 mi · Simi Valley 12 mi · Camarillo 14 mi · Thousand Oaks 16 mi · Valencia 18 mi · Castaic 18 mi · Stevenson Ranch 20 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 Fillmore (34.3992°, -118.9181°, elevation 456 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).