Mount Vernon weather in January

In January, Mount Vernon sees average daytime highs of 42°F and overnight lows near 34°F, with 10.2 in of precipitation across 19.1 wet days and about 8.6 hours of daylight. It is the 11th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 41°F in the first days to 43°F by the end. The sky is clear or mostly clear about 16% of the time in January, and the air most often feels dry.

Daylight stretches from about 8 h 12 min at the start of January to 9 h 06 min by month's end. Set against the rest of the year, January is Mount Vernon's 11th-clearest and 3rd-windiest month. For the whole year in context, see Mount Vernon's year-round climate.

Daytime high
42°
11th warmest
Overnight low
34°
2nd coldest
Precipitation
10.2 in
19.1 wet days
Daylight
8 h 30 min
8:03 AM – 4:34 PM
Cloud cover
77%
11th clearest
Wind
5 mph
3rd windiest
Solar energy
1 kWh/m²
Travel score
0.2
out of 10

Mount Vernon is city in Skagit County, Washington, United States.

Density
1,050/km²
people per km²
Founded
1870

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

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 41°F in the first days to 43°F by the end.

A typical January day in Mount Vernon reaches about 42°F in the afternoon and slips back to 34°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 48°F. Set against its neighbours, January runs on par with December and about 3°F cooler than February.

20°30°40°50°60°151015202531
Avg high (°F)Avg low (°F)
14033
24033
34133
44133
54133
64133
74133
84133
94133
104133
114133
124133
134233
144234
154234
164234
174234
184234
194234
204234
214334
224334
234335
244335
254335
264335
274335
284335
294335
304435
314435

How January really feels in Mount Vernon

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 weather by month

How January compares with the rest of the year at a glance. January is the 11th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan42° / 34°10.219.19.58.60.2
Feb44° / 34°6.715.499.90.7
Mar48° / 37°8.119.79.811.61.4
Apr53° / 41°5.816.6413.42.5
May60° / 47°4.112.80.7154.4
Jun64° / 51°3.110.9015.85.5
Jul70° / 55°1.55.6015.57.4
Aug71° / 56°1.85.7014.17.5
Sep65° / 51°3.99.5012.46.1
Oct55° / 44°7.915.20.710.63.2
Nov46° / 37°11.419.47.791.0
Dec41° / 33°10.01912.28.20.1

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in January.

Beyond those clear spells, partly cloudy skies cover about 7% of January, with mostly cloudy or overcast conditions the remaining 77%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12377
22278
32278
42278
52278
62377
72377
82377
92476
102377
112377
122377
132377
142476
152476
162476
172377
182377
192377
202377
212377
222377
232377
242278
252278
262278
272377
282377
292377
302476
312476

Chance of precipitation in January

Any precipitationSnow

Mount Vernon gets around 10.2 in of rain and snow over 19.1 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 61% and peaks near 64% on the wettest days, and about 10 days bring snow.

0%20%40%60%151015202531
Rain chance (%)Snow chance (%)
16338
26337
36437
46436
56435
66434
76434
86333
96332
106332
116332
126231
136231
146130
156130
166029
176029
185929
195929
205929
215929
225929
235929
246029
256029
266029
275929
285929
295929
305828
315828

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 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 January

Winds average 5 mph in January.

Across January, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 8 h 12 min at the start of January to 9 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over January. Sunrise moves from 8:07 AM to 7:49 AM, and sunset from 4:18 PM to 4:56 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.28:074:18
28.28:074:18
38.28:074:19
48.28:074:20
58.28:074:21
68.38:074:22
78.38:074:23
88.38:074:25
98.38:064:26
108.38:064:27
118.48:064:28
128.48:054:29
138.48:054:30
148.58:044:32
158.58:044:33
168.58:034:34
178.68:024:36
188.68:024:37
198.68:014:38
208.78:004:40
218.77:594:41
228.77:584:43
238.87:584:44
248.87:574:46
258.97:564:47
268.97:554:49
278.97:544:50
289.07:534:52
299.07:514:53
309.17:504:55
319.17:494:56

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 1 kWh/m².

For context, solar energy here swings from a low near 0.85 kWh/m² to a high of 6.27 kWh/m² in July across the year — January's 1 kWh/m² sits near the bottom.

00.511.52151015202531
Solar energy (kWh/m²)Level
10.9Dim
20.9Dim
30.9Dim
40.9Dim
50.9Dim
60.9Dim
70.9Dim
80.9Dim
90.9Dim
100.9Dim
110.9Dim
120.9Dim
131.0Dim
141.0Dim
151.0Dim
161.0Dim
171.0Dim
181.0Dim
191.1Dim
201.1Dim
211.1Dim
221.1Dim
231.1Dim
241.2Dim
251.2Dim
261.2Dim
271.2Dim
281.3Dim
291.3Dim
301.3Dim
311.4Dim
Planning a trip in January

Hazard calendar for Mount Vernon

In seasonPeak

In January, Mount Vernon sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Mount Vernon's rainy season runs October–April, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is January a good time to visit Mount Vernon?

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

0.2
Sightseeing
11th-best month of the year
0.0
Beach & pool
8th-best month of the year

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

What to pack for Mount Vernon in January

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

In January, Mount Vernon sees daytime highs around 42°F and nights near 34°F. Pack a warm layer and rain gear. Worth having: a heavy coat. About 19 days see rain.

a warm layerrain geara heavy coat

Sea temperature near Mount Vernon in January

The nearest coast averages about 46°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 25 mi away) is warmest in August at about 54°F and coldest in February near 46°F.

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

45°50°55°JanFebMarAprMayJunJulAugSepOctNovDecbracing
Sea temperature (°F)Comfort
Jan46Bracing
Feb46Bracing
Mar47Bracing
Apr48Bracing
May50Bracing
Jun52Bracing
Jul53Bracing
Aug54Bracing
Sep53Bracing
Oct50Bracing
Nov49Bracing
Dec47Bracing

UV index in Mount Vernon in January

LowModerateHighVery highExtreme

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

Under clear skies, the midday UV index in Mount Vernon peaks around July 17 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 18 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 17UV 8Dec 18UV 1
UV index (midday)Level
Jan1Low
Feb1Low
Mar4Moderate
Apr5Moderate
May7High
Jun6High
Jul8Very high
Aug6High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Mount Vernon 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 is worst in September — around 18 µg/m³ PM2.5 (moderate), about 3.2× the cleanest month (December, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1018 µg/m³Dec 176 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb9Good
Mar12Good
Apr12Good
May12Good
Jun11Good
Jul11Good
Aug18Moderate
Sep18Moderate
Oct12Good
Nov7Good
Dec6Good
Location & terrain

Where is Mount Vernon?

Mount Vernon sits at 48.4°N, 122.3°W, 95 ft above sea level, in United States. The nearest listed city is Anacortes, 14 mi away.

Topography around Mount Vernon

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

Within 2 miles, the terrain around Mount Vernon has significant variations in elevation — a maximum elevation change of 938 ft around an average of 89 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 4,045 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,755 ft.

The land around Mount Vernon is covered by trees (29%), grassland (28%) and artificial surfaces (27%) within 2 miles, trees (41%) and grassland (25%) within 10 miles, and trees (57%) and water (29%) within 50 miles.

2 miles
938 ft
10 miles
4,045 ft
50 miles
10,755 ft
treesgrasslandcroplandartificial surfacesbare terrainsnow and icewaterwetland
January weather nearby: Anacortes 14 mi · Oak Harbor 17 mi · Arlington 18 mi · Bellingham 24 mi · Marysville 27 mi · Lake Stevens 30 mi · Everett 31 mi · West Lake Stevens 32 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 (48.4212°, -122.3341°, 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. 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).