Westfield weather in December

In December, Westfield sees average daytime highs of 38°F and overnight lows near 25°F, with 4.4 in of precipitation across 10.4 wet days and about 9 hours of daylight. It is the 10th-warmest and 2nd-wettest month of the year here.

Highs ease over the month, from about 42°F in the first days to 36°F by the end. The sky is clear or mostly clear about 28% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 12 min at the start of December to 9 hours by month's end. Set against the rest of the year, December is Westfield's 8th-clearest and 4th-windiest month. For the whole year in context, see Westfield's year-round climate.

Daytime high
38°
10th warmest
Overnight low
25°
3rd coldest
Precipitation
4.4 in
10.4 wet days
Daylight
8 h 54 min
7:19 AM – 4:15 PM
Cloud cover
62%
8th clearest
Wind
7 mph
4th windiest
Solar energy
1.62 kWh/m²
Travel score
0.0
out of 10

Westfield is city in Hampden County, Massachusetts, United States.

Density
340/km²
people per km²
Founded
1660

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 42°F in the first days to 36°F by the end.

A typical December day in Westfield reaches about 38°F in the afternoon and slips back to 25°F overnight — a 14°F spread between the day's warmth and the night's chill. On most days the high lands between 26°F and 51°F. Set against its neighbours, December runs about 10°F cooler than November and about 5°F warmer than January.

20°40°60°151015202531
Avg high (°F)Avg low (°F)
14329
24229
34228
44228
54128
64127
74027
84026
93926
103926
113925
123825
133825
143825
153824
163824
173724
183724
193724
203724
213723
223723
233723
243723
253623
263623
273622
283622
293622
303622
313522

How December really feels in Westfield

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
31
6 feel bitter (≤ 14°F)

The story in December is cold — wind chill drags the overnight "feels like" below the raw low.

Westfield weather by month

How December compares with the rest of the year at a glance. December is the 10th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan33° / 19°3.59.66.69.30.0
Feb36° / 20°3.28.96.110.30.0
Mar44° / 28°4.210.95.311.70.8
Apr57° / 39°4.011.31.613.13.8
May67° / 48°3.711.7014.45.9
Jun76° / 58°4.111.70156.4
Jul81° / 63°4.010.8014.86.3
Aug79° / 61°4.110.2013.76.6
Sep72° / 54°4.28.8012.36.9
Oct60° / 43°4.69.50.410.84.9
Nov48° / 33°3.59.21.79.61.9
Dec38° / 25°4.410.45.590.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 28% of the time in December.

Beyond those clear spells, partly cloudy skies cover about 16% of December, with mostly cloudy or overcast conditions the remaining 56%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24654
34654
44654
54654
64654
74555
84456
94456
104456
114357
124357
134357
144159
154159
164258
174159
184159
194258
204258
214357
224357
234357
244456
254456
264555
274555
284555
294555
304555
314555

Chance of precipitation in December

Any precipitationSnow

Westfield gets around 4.4 in of rain and snow over 10.4 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 34% and peaks near 35% on the wettest days, and about 6 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
13313
23314
33415
43415
53416
63417
73518
83518
93519
103519
113519
123520
133419
143419
153419
163418
173318
183317
193317
203217
213216
223216
233216
243216
253216
263217
273317
283317
293418
303418
313419

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 7 mph in December.

Across December, daily wind ranges from about 7 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 12 min at the start of December to 9 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 12 minutes over December. Sunrise moves from 7:06 AM to 7:25 AM, and sunset from 4:15 PM to 4:23 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.27:064:15
29.17:074:15
39.17:084:15
49.17:094:15
59.17:104:15
69.17:114:14
79.07:124:14
89.07:134:14
99.07:144:14
109.07:144:14
119.07:154:14
129.07:164:15
139.07:174:15
149.07:184:15
158.97:184:15
168.97:194:15
178.97:204:16
188.97:204:16
198.97:214:16
208.97:214:17
218.97:224:17
228.97:224:18
238.97:234:18
248.97:234:19
258.97:244:19
268.97:244:20
278.97:244:20
288.97:254:21
298.97:254:22
309.07:254:22
319.07:254:23

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.62 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.62 kWh/m² to a high of 5.91 kWh/m² in July across the year — December's 1.62 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.7Dim
21.7Dim
31.7Dim
41.7Dim
51.7Dim
61.7Dim
71.6Dim
81.6Dim
91.6Dim
101.6Dim
111.6Dim
121.6Dim
131.6Dim
141.6Dim
151.6Dim
161.6Dim
171.6Dim
181.6Dim
191.6Dim
201.6Dim
211.6Dim
221.6Dim
231.6Dim
241.6Dim
251.6Dim
261.6Dim
271.6Dim
281.6Dim
291.7Dim
301.7Dim
311.7Dim
Planning a trip in December

Is December a good time to visit Westfield?

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

0.0
Sightseeing
10th-best month of the year
0.0
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Westfield.

What to pack for Westfield in December

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

In December, Westfield sees daytime highs around 38°F and nights near 25°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 10 days see rain.

a warm layera heavy coatrain gear

UV index in Westfield in December

LowModerateHighVery highExtreme

Clear-sky midday UV in December peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Westfield peaks around July 11 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 11UV 8Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb3Moderate
Mar4Moderate
Apr5High
May8Very high
Jun7Very high
Jul8Very high
Aug5High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Westfield 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 Westfield is worst in July — around 15 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 7 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1615 µg/m³Nov 197 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb11Good
Mar12Good
Apr12Good
May13Moderate
Jun14Moderate
Jul15Moderate
Aug13Moderate
Sep11Good
Oct9Good
Nov7Good
Dec8Good
Location & terrain

Where is Westfield?

Westfield sits at 42.1°N, 72.7°W, 141 ft above sea level, in United States. The nearest listed city is West Springfield, 6.8 mi away.

Topography around Westfield

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

Within 2 miles, the terrain around Westfield has only modest variations in elevation — a maximum elevation change of 364 ft around an average of 200 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,470 ft; within 50 miles, large variations in elevation — a maximum elevation change of 3,465 ft.

The land around Westfield is covered by trees (64%) within 2 miles, trees (77%) within 10 miles, and trees (90%) within 50 miles.

2 miles
364 ft
10 miles
1,470 ft
50 miles
3,465 ft
treesgrasslandcroplandartificial surfaceswater
December weather nearby: West Springfield 6.8 mi · Chicopee 7.5 mi · Agawam 8.1 mi · Springfield 8.1 mi · North Chicopee 8.7 mi · Holyoke 8.7 mi · Longmeadow 9.9 mi · Easthampton 11 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 Westfield (42.1251°, -72.7495°, elevation 141 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).