Mount Vernon Triangle weather in January

In January, Mount Vernon Triangle sees average daytime highs of 43°F and overnight lows near 28°F, with 3.1 in of precipitation across 8.6 wet days and about 9.6 hours of daylight. It is the 12th-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 43°F through the month. The sky is clear or mostly clear about 32% of the time in January, and the air most often feels dry.

Daylight stretches from about 9 h 18 min at the start of January to 10 hours by month's end. Set against the rest of the year, January is Mount Vernon Triangle's 6th-clearest and 2nd-windiest month. For the whole year in context, see Mount Vernon Triangle's year-round climate.

Daytime high
43°
12th warmest
Overnight low
28°
1st coldest
Precipitation
3.1 in
8.6 wet days
Daylight
9 h 36 min
7:31 AM – 5:04 PM
Cloud cover
59%
6th clearest
Wind
7 mph
2nd windiest
Solar energy
2.25 kWh/m²
Travel score
0.4
out of 10

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 43°F through the month.

A typical January day in Mount Vernon Triangle reaches about 43°F in the afternoon and slips back to 28°F overnight — a 15°F spread between the day's warmth and the night's chill. On most days the high lands between 30°F and 57°F. Set against its neighbours, January runs about 4°F cooler than December and about 3°F cooler than February.

20°40°60°151015202531
Avg high (°F)Avg low (°F)
14430
24430
34430
44430
54430
64430
74429
84429
94329
104329
114329
124329
134328
144228
154228
164228
174228
184228
194227
204227
214227
224227
234227
244227
254227
264227
274227
284227
294227
304327
314327

How January really feels in Mount Vernon Triangle

Once humidity and wind are folded in, January 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
wind chill below the day's low

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

Mount Vernon Triangle weather by month

How January compares with the rest of the year at a glance. January is the 12th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan43° / 28°3.18.62.99.60.4
Feb46° / 29°2.98.52.810.51.2
Mar55° / 36°3.910.31.911.73.4
Apr66° / 47°3.410.10.1135.9
May74° / 56°3.811014.16.6
Jun83° / 65°3.511.3014.75.4
Jul88° / 70°4.112.1014.44.3
Aug85° / 68°3.510.1013.55.1
Sep79° / 61°4.39.3012.36.8
Oct67° / 49°3.47.80116.6
Nov56° / 39°2.97.50.29.94.1
Dec47° / 32°3.58.81.69.31.5

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 32% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 15% of January, with mostly cloudy or overcast conditions the remaining 53%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24951
34951
44951
54951
64852
74852
84753
94753
104654
114654
124654
134654
144654
154555
164555
174555
184555
194654
204555
214555
224654
234654
244654
254753
264852
274852
284852
294852
304852
314852

Chance of precipitation in January

Any precipitationSnow

Mount Vernon Triangle gets around 3.1 in of rain and snow over 8.6 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 28% and peaks near 30% on the wettest days, and about 3 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1276
2287
3287
4297
5297
6297
7308
8308
9308
10308
11309
12309
13309
14309
153010
162910
172910
182810
192810
202810
212711
222711
232711
242611
252611
262611
272611
282611
292611
302611
312611

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January 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 (%)Humid (%)
19811
29811
39811
49811
59811
69811
79811
89811
99811
109811
119811
129811
139811
149910
159910
169910
179910
189910
199910
209910
219910
229910
239910
2410000
2510000
2610000
2710000
2810000
2910000
3010000
3110000

Wind in January

Winds average 7 mph in January.

Across January, 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 January

DaylightNight

Daylight runs from about 9 h 18 min at the start of January to 10 hours by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over January. Sunrise moves from 7:32 AM to 7:23 AM, and sunset from 4:51 PM to 5:20 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
19.37:324:51
29.37:324:51
39.37:324:52
49.37:324:53
59.47:324:54
69.47:324:55
79.47:324:56
89.47:324:56
99.47:324:57
109.47:324:58
119.57:324:59
129.57:325:00
139.57:315:01
149.57:315:02
159.57:315:03
169.67:315:04
179.67:305:05
189.67:305:06
199.67:305:07
209.67:295:08
219.77:295:09
229.77:285:10
239.77:285:11
249.87:275:12
259.87:275:14
269.87:265:15
279.87:255:16
289.97:255:17
299.97:245:18
309.97:235:19
3110.07:235:20

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 2.25 kWh/m².

For context, solar energy here swings from a low near 1.95 kWh/m² to a high of 6.14 kWh/m² in June across the year — January's 2.25 kWh/m² sits near the bottom.

0123151015202531
Solar energy (kWh/m²)Level
12.0Moderate
22.0Moderate
32.0Moderate
42.0Moderate
52.0Moderate
62.0Moderate
72.1Moderate
82.1Moderate
92.1Moderate
102.1Moderate
112.1Moderate
122.1Moderate
132.1Moderate
142.2Moderate
152.2Moderate
162.2Moderate
172.2Moderate
182.3Moderate
192.3Moderate
202.3Moderate
212.4Moderate
222.4Moderate
232.4Moderate
242.5Moderate
252.5Moderate
262.5Moderate
272.5Moderate
282.6Moderate
292.6Moderate
302.6Moderate
312.7Moderate
Planning a trip in January

Hazard calendar for Mount Vernon Triangle

In seasonPeak

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

Mount Vernon Triangle 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 January a good time to visit Mount Vernon Triangle?

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

0.4
Sightseeing
12th-best month of the year
0.0
Beach & pool
10th-best month of the year

January is a weaker month for outdoor sightseeing in Mount Vernon Triangle.

What to pack for Mount Vernon Triangle in January

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

In January, Mount Vernon Triangle sees daytime highs around 43°F and nights near 28°F. Pack a warm layer and a heavy coat. Worth having: rain gear. About 9 days see rain.

a warm layera heavy coatrain gear

Sea temperature near Mount Vernon Triangle in January

The nearest coast averages about 38°F in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 35 mi away) is warmest in August at about 78°F and coldest in February near 37°F.

It's comfortable for a long swim from Jun 16 to Oct 6 — about 3.7 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmtropicalcomfortable to swim
Sea temperature (°F)Comfort
Jan38Bracing
Feb37Bracing
Mar40Bracing
Apr47Bracing
May58Bracing
Jun68Refreshing
Jul76Warm
Aug78Warm
Sep74Refreshing
Oct65Cool
Nov54Bracing
Dec45Bracing

UV index in Mount Vernon Triangle in January

LowModerateHighVery highExtreme

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

Under clear skies, the midday UV index in Mount Vernon Triangle peaks around July 11 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJul 11UV 9Dec 19UV 2
UV index (midday)Level
Jan2Moderate
Feb3Moderate
Mar5High
Apr6High
May8Very high
Jun9Very high
Jul9Very high
Aug7High
Sep6High
Oct4Moderate
Nov3Moderate
Dec2Low

Air quality in Mount Vernon Triangle in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Mount Vernon Triangle is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (November, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJul 1317 µg/m³Nov 129 µg/m³
PM2.5 (µg/m³)Level
Jan11Good
Feb12Moderate
Mar13Moderate
Apr13Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug15Moderate
Sep12Moderate
Oct9Good
Nov9Good
Dec10Good
Location & terrain

Where is Mount Vernon Triangle?

Mount Vernon Triangle sits at 38.9°N, 77.0°W, 49 ft above sea level, in United States. The nearest listed city is Northwest One, 0.0 mi away.

Topography around Mount Vernon Triangle

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

Within 2 miles, the terrain around Mount Vernon Triangle has only modest variations in elevation — a maximum elevation change of 249 ft around an average of 85 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 509 ft; within 50 miles, large variations in elevation — a maximum elevation change of 2,116 ft.

The land around Mount Vernon Triangle is covered by artificial surfaces (81%) within 2 miles, trees (59%) and artificial surfaces (30%) within 10 miles, and trees (58%) within 50 miles.

2 miles
249 ft
10 miles
509 ft
50 miles
2,116 ft
treesgrasslandcroplandartificial surfaceswater
January weather nearby: Northwest One 0.0 mi · NoMa 0.6 mi · Downtown DC 0.6 mi · Shaw 0.6 mi · H Street NE 1.2 mi · Washington, D.C. 1.2 mi · Capitol Hill 1.2 mi · Golden Triangle 1.2 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 Mount Vernon Triangle (38.9023°, -77.0169°, elevation 49 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).