Greenfield weather in December

In December, Greenfield sees average daytime highs of 58°F and overnight lows near 40°F, with 2.9 in of rain across 7.3 wet days and about 9.6 hours of daylight. It is the 12th-warmest and 3rd-wettest month of the year here.

Day-to-day highs hold fairly steady near 58°F through the month. The sky is clear or mostly clear about 40% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 42 min at the start of December to 9 h 36 min by month's end. Set against the rest of the year, December is Greenfield's 10th-clearest and 6th-windiest month. For the whole year in context, see Greenfield's year-round climate.

Daytime high
58°
12th warmest
Overnight low
40°
1st coldest
Rainfall
2.9 in
7.3 wet days
Daylight
9 h 30 min
7:15 AM – 4:47 PM
Cloud cover
52%
10th clearest
Wind
4 mph
6th windiest
Solar energy
2.61 kWh/m²
Travel score
4.6
out of 10

Greenfield is city in Monterey County, California, United States.

Density
3,107/km²
people per km²
Founded
1947

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

Temperature in December

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 58°F through the month.

A typical December day in Greenfield 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 50°F and 66°F. Set against its neighbours, December runs about 7°F cooler than November and on par with January.

20°30°40°50°60°70°151015202531
Avg high (°F)Avg low (°F)
16041
26041
35941
45941
55941
65941
75841
85841
95840
105840
115840
125840
135740
145740
155740
165740
175739
185739
195739
205739
215739
225739
235739
245739
255739
265739
275739
285739
295739
305739
315739

Greenfield weather by month

How December compares with the rest of the year at a glance. December is the 12th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan58° / 40°3.57.69.84.5
Feb59° / 41°3.58.510.64.7
Mar63° / 43°2.67.511.75.9
Apr67° / 45°1.14.312.97.3
May74° / 50°0.52.213.98.7
Jun82° / 55°0.10.414.48.3
Jul87° / 60°0.00.314.26.4
Aug87° / 60°0.00.213.46.3
Sep83° / 58°0.10.712.27.9
Oct75° / 52°0.72.111.18.8
Nov64° / 44°1.24.210.16.8
Dec58° / 40°2.97.39.64.6

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 40% 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 46%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15743
25644
35644
45545
55545
65446
75347
85347
95347
105347
115248
125248
135347
145347
155347
165347
175446
185446
195545
205545
215545
225446
235446
245446
255446
265347
275248
285248
295248
305149
315050

Chance of precipitation in December

Any precipitation

Greenfield gets around 2.9 in of rain over 7.3 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 23% and peaks near 24% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
121
221
322
422
523
623
723
823
923
1023
1123
1223
1323
1423
1523
1623
1723
1823
1923
2023
2123
2223
2324
2424
2524
2624
2724
2824
2924
3024
3124

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 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
1991
2991
3991
4991
5991
6991
7991
8991
9991
10991
11991
12991
13991
14991
151000
161000
171000
181000
19991
20991
21991
22991
23991
24991
25991
26991
27991
28991
29991
30991
31991

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.

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 42 min at the start of December to 9 h 36 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 7:04 AM to 7:21 AM, and sunset from 4:46 PM to 4:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.77:044:46
29.77:044:46
39.77:054:46
49.77:064:46
59.67:074:46
69.67:084:46
79.67:094:46
89.67:094:46
99.67:104:46
109.67:114:46
119.67:124:46
129.67:124:46
139.67:134:46
149.57:144:47
159.57:144:47
169.57:154:47
179.57:164:48
189.57:164:48
199.57:174:48
209.57:174:49
219.57:184:49
229.57:184:50
239.57:194:50
249.57:194:51
259.57:204:51
269.57:204:52
279.57:204:52
289.57:214:53
299.57:214:53
309.57:214:54
319.67:214:55

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 2.61 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 2.61 kWh/m² to a high of 8.4 kWh/m² in June across the year — December's 2.61 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.7Moderate
22.7Moderate
32.7Moderate
42.6Moderate
52.6Moderate
62.6Moderate
72.6Moderate
82.6Moderate
92.6Moderate
102.6Moderate
112.5Moderate
122.5Moderate
132.5Moderate
142.5Moderate
152.5Moderate
162.5Moderate
172.5Moderate
182.5Moderate
192.5Moderate
202.6Moderate
212.6Moderate
222.6Moderate
232.6Moderate
242.6Moderate
252.6Moderate
262.6Moderate
272.6Moderate
282.6Moderate
292.6Moderate
302.6Moderate
312.7Moderate
Planning a trip in December

Is December a good time to visit Greenfield?

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

4.6
Sightseeing
11th-best month of the year
0.1
Beach & pool
11th-best month of the year

December is a reasonable time to visit Greenfield for sightseeing.

What to pack for Greenfield in December

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

In December, Greenfield sees daytime highs around 58°F and nights near 40°F. Worth packing: a warm layer. About 7 days see rain.

a warm layer

Sea temperature near Greenfield in December

The nearest coast averages about 56°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 25 mi away) is warmest in September at about 59°F and coldest in April near 54°F.

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

52°54°56°58°60°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan55Bracing
Feb55Bracing
Mar55Bracing
Apr54Bracing
May54Bracing
Jun55Bracing
Jul57Bracing
Aug59Bracing
Sep59Cool
Oct59Cool
Nov58Bracing
Dec56Bracing

UV index in Greenfield in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Greenfield peaks around June 21 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 21UV 11Dec 14UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7High
May9Very high
Jun11Extreme
Jul11Extreme
Aug10Extreme
Sep7Very high
Oct6High
Nov3Moderate
Dec2Moderate

Air quality in Greenfield 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 Greenfield is worst in September — around 27 µg/m³ PM2.5 (moderate), about 7.0× the cleanest month (December, 4 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1027 µg/m³Dec 174 µg/m³
PM2.5 (µg/m³)Level
Jan4Good
Feb5Good
Mar5Good
Apr5Good
May5Good
Jun5Good
Jul16Moderate
Aug25Moderate
Sep27Moderate
Oct6Good
Nov4Good
Dec4Good
Location & terrain

Where is Greenfield?

Greenfield sits at 36.3°N, 121.2°W, 289 ft above sea level, in United States. The nearest listed city is Soledad, 8.7 mi away.

Topography around Greenfield

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

Within 2 miles, the terrain around Greenfield has only modest variations in elevation — a maximum elevation change of 131 ft around an average of 279 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,671 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,883 ft.

The land around Greenfield is covered by cropland (67%) within 2 miles, grassland (53%) and cropland (22%) within 10 miles, and grassland (47%) and trees (23%) within 50 miles.

2 miles
131 ft
10 miles
3,671 ft
50 miles
5,883 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
December weather nearby: Soledad 8.7 mi · Big Sur 32 mi · Salinas 34 mi · Hollister 38 mi · Seaside 39 mi · Prunedale 39 mi · Marina 40 mi · Monterey 41 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 Greenfield (36.3208°, -121.2438°, elevation 289 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).