Coram weather in December

In December, Coram sees average daytime highs of 45°F and overnight lows near 37°F, with 4.6 in of precipitation across 10.3 wet days and about 9.1 hours of daylight. It is the 9th-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 48°F in the first days to 42°F by the end. The sky is clear or mostly clear about 31% of the time in December, and the air most often feels dry.

Daylight stretches from about 9 h 18 min at the start of December to 9 h 06 min by month's end. Set against the rest of the year, December is Coram's 11th-clearest and 2nd-windiest month. For the whole year in context, see Coram's year-round climate.

Daytime high
45°
9th warmest
Overnight low
37°
4th coldest
Precipitation
4.6 in
10.3 wet days
Daylight
9 h 06 min
7:16 AM – 4:21 PM
Cloud cover
61%
11th clearest
Wind
14 mph
2nd windiest
Solar energy
1.75 kWh/m²
Travel score
1.0
out of 10

Coram is census-designated place in Suffolk County, New York.

Density
1,092/km²
people per km²

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 48°F in the first days to 42°F by the end.

A typical December day in Coram reaches about 45°F in the afternoon and slips back to 37°F overnight — a 8°F spread between the day's warmth and the night's chill. On most days the high lands between 35°F and 55°F. Set against its neighbours, December runs about 8°F cooler than November and about 6°F warmer than January.

20°30°40°50°60°151015202531
Avg high (°F)Avg low (°F)
14941
24841
34840
44840
54740
64739
74739
84739
94638
104638
114638
124638
134537
144537
154537
164537
174537
184436
194436
204436
214436
224436
234435
244335
254335
264335
274335
284334
294234
304234
314234

How December really feels in Coram

Once humidity and wind are folded in, December averages 0 days that feel above 90°F and 27 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
27
wind chill below the day's low

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

Coram weather by month

How December compares with the rest of the year at a glance. December is the 9th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan39° / 31°3.79.949.40.0
Feb39° / 30°3.49.33.710.40.0
Mar44° / 36°4.410.22.811.70.8
Apr52° / 44°3.610.50.413.12.7
May61° / 53°3.310.2014.24.9
Jun70° / 64°3.49.6014.96.6
Jul77° / 71°3.28.8014.67.2
Aug76° / 70°3.89.4013.67.2
Sep71° / 65°3.78.9012.36.9
Oct62° / 55°4.38.9010.95.5
Nov53° / 45°3.68.80.39.73.1
Dec45° / 37°4.610.32.39.11.0

Cloud cover in December

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% 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 56%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14753
24753
34654
44654
54555
64357
74357
84258
94258
104159
114060
124060
134060
144060
154159
164060
174060
184159
194258
204357
214456
224555
234555
244555
254555
264654
274753
284852
294852
304753
314852

Chance of precipitation in December

Any precipitationSnow

Coram gets around 4.6 in of rain and snow over 10.3 wet days in December, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 33% and peaks near 36% on the wettest days, and about 2 days bring snow.

0%10%20%30%40%50%151015202531
Rain chance (%)Snow chance (%)
1334
2335
3345
4346
5356
6357
7357
8367
9368
10358
11358
12358
13348
14348
15338
16338
17328
18328
19327
20317
21317
22317
23307
24307
25317
26318
27318
28318
29329
30329
313210

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 (%)Comfortable (%)
1991
2991
3991
4991
5991
6991
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in December

Winds average 14 mph in December.

Across December, daily wind ranges from about 13 mph on the calmest days to 14 mph at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (mph)Feels
113breezy
213breezy
313breezy
413breezy
513breezy
613breezy
713breezy
813breezy
913breezy
1013breezy
1113breezy
1213breezy
1314breezy
1414breezy
1514breezy
1614breezy
1714breezy
1814breezy
1914breezy
2014breezy
2114breezy
2214breezy
2314breezy
2414breezy
2514breezy
2614breezy
2714breezy
2814breezy
2914breezy
3014breezy
3114breezy

Sunrise & sunset in December

DaylightNight

Daylight runs from about 9 h 18 min at the start of December to 9 h 06 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 7:03 AM to 7:22 AM, and sunset from 4:20 PM to 4:28 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.37:034:20
29.37:044:20
39.27:054:20
49.27:064:20
59.27:074:20
69.27:084:19
79.27:094:19
89.27:104:19
99.17:114:19
109.17:114:20
119.17:124:20
129.17:134:20
139.17:144:20
149.17:144:20
159.17:154:20
169.17:164:21
179.17:164:21
189.17:174:21
199.17:184:22
209.17:184:22
219.17:194:22
229.17:194:23
239.17:204:23
249.17:204:24
259.17:204:24
269.17:214:25
279.17:214:26
289.17:214:26
299.17:224:27
309.17:224:28
319.17:224:28

Solar energy in December

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in December, about 1.75 kWh/m² — the year's lowest.

For context, solar energy here swings from a low near 1.75 kWh/m² to a high of 6.48 kWh/m² in June across the year — December's 1.75 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.9Dim
21.9Dim
31.9Dim
41.9Dim
51.8Dim
61.8Dim
71.8Dim
81.8Dim
91.8Dim
101.8Dim
111.7Dim
121.7Dim
131.7Dim
141.7Dim
151.7Dim
161.7Dim
171.7Dim
181.7Dim
191.7Dim
201.7Dim
211.7Dim
221.7Dim
231.7Dim
241.7Dim
251.8Dim
261.8Dim
271.8Dim
281.8Dim
291.8Dim
301.8Dim
311.8Dim
Planning a trip in December

Hazard calendar for Coram

In seasonPeak

None of Coram's seasonal hazards are active in December. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Coram sits in the Atlantic hurricane belt; the season peaks August–October.

Atlantic hurricane
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is December a good time to visit Coram?

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

1.0
Sightseeing
9th-best month of the year
0.0
Beach & pool
9th-best month of the year

December is a weaker month for outdoor sightseeing in Coram.

What to pack for Coram in December

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

In December, Coram sees daytime highs around 45°F and nights near 37°F. Pack a warm layer. Worth having: a heavy coat, rain gear and a windbreaker. About 10 days see rain.

a warm layera heavy coatrain geara windbreaker

Sea temperature near Coram in December

The nearest coast averages about 49°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 18 mi away) is warmest in August at about 73°F and coldest in February near 40°F.

It's comfortable for a long swim from Jul 3 to Sep 23 — about 2.7 months when the water holds above 68°F.

40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan43Bracing
Feb40Bracing
Mar40Bracing
Apr45Bracing
May54Bracing
Jun64Cool
Jul72Refreshing
Aug73Refreshing
Sep70Refreshing
Oct63Cool
Nov55Bracing
Dec49Bracing

UV index in Coram 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 Coram 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 December 22 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 8Dec 22UV 1
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun8Very high
Jul8Very high
Aug6High
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low

Air quality in Coram 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 Coram is worst in July — around 17 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 8 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1016 µg/m³Nov 178 µg/m³
PM2.5 (µg/m³)Level
Jan10Good
Feb12Good
Mar14Moderate
Apr15Moderate
May16Moderate
Jun16Moderate
Jul17Moderate
Aug14Moderate
Sep11Good
Oct9Good
Nov8Good
Dec8Good
Location & terrain

Where is Coram?

Coram sits at 40.9°N, 73.0°W, 95 ft above sea level, in United States. The nearest listed city is Selden, 1.9 mi away.

Topography around Coram

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

Within 2 miles, the terrain around Coram has only modest variations in elevation — a maximum elevation change of 253 ft around an average of 138 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 335 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 1,083 ft.

The land around Coram is covered by trees (77%) within 2 miles, trees (61%) within 10 miles, and water (52%) and trees (37%) within 50 miles.

2 miles
253 ft
10 miles
335 ft
50 miles
1,083 ft
treesgrasslandcroplandartificial surfaceswaterwetland
December weather nearby: Selden 1.9 mi · Farmingville 3.1 mi · Medford 3.7 mi · Holtsville 4.3 mi · Centereach 5.0 mi · Holbrook 5.6 mi · Setauket-East Setauket 6.8 mi · East Patchogue 6.8 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 Coram (40.8687°, -73.0015°, elevation 95 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. Tropical-cyclone seasons are the published climatological basin seasons (NOAA National Hurricane Center / regional warning centres). 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).