Mount Vernon weather in May
In May, Mount Vernon sees average daytime highs of 60°F and overnight lows near 47°F, with 4.1 in of precipitation across 12.8 wet days and about 15 hours of daylight. It is the 5th-warmest and 8th-wettest month of the year here.
Highs climb over the month, from about 57°F in the first days to 62°F by the end. The sky is clear or mostly clear about 21% of the time in May, and the air most often feels dry.
Daylight stretches from about 14 h 18 min at the start of May to 15 h 36 min by month's end. Set against the rest of the year, May is Mount Vernon's 5th-clearest and 8th-windiest month. For the whole year in context, see Mount Vernon's year-round climate.
- Daytime high
- 60°
- 5th warmest
- Overnight low
- 47°
- 8th coldest
- Precipitation
- 4.1 in
- 12.8 wet days
- Daylight
- 15 hours
- 4:36 AM – 7:35 PM
- Cloud cover
- 66%
- 5th clearest
- Wind
- 4 mph
- 8th windiest
- Solar energy
- 5.39 kWh/m²
- Travel score
- 4.4
- 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 May
Highs climb over the month, from about 57°F in the first days to 62°F by the end.
A typical May day in Mount Vernon reaches about 60°F in the afternoon and slips back to 47°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 52°F and 69°F. Set against its neighbours, May runs about 6°F warmer than April and about 4°F cooler than June.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 57 | 57 | 57 | 57 | 58 | 58 | 58 | 58 | 58 | 59 | 59 | 59 | 59 | 60 | 60 | 60 | 60 | 60 | 60 | 61 | 61 | 61 | 61 | 61 | 61 | 62 | 62 | 62 | 62 | 62 | 62 |
| Avg low (°F) | 43 | 44 | 44 | 44 | 44 | 44 | 45 | 45 | 45 | 46 | 46 | 46 | 46 | 46 | 47 | 47 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 48 | 49 | 49 | 49 | 49 | 49 | 49 | 49 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 57 | 43 |
| 2 | 57 | 44 |
| 3 | 57 | 44 |
| 4 | 57 | 44 |
| 5 | 58 | 44 |
| 6 | 58 | 44 |
| 7 | 58 | 45 |
| 8 | 58 | 45 |
| 9 | 58 | 45 |
| 10 | 59 | 46 |
| 11 | 59 | 46 |
| 12 | 59 | 46 |
| 13 | 59 | 46 |
| 14 | 60 | 46 |
| 15 | 60 | 47 |
| 16 | 60 | 47 |
| 17 | 60 | 47 |
| 18 | 60 | 47 |
| 19 | 60 | 47 |
| 20 | 61 | 48 |
| 21 | 61 | 48 |
| 22 | 61 | 48 |
| 23 | 61 | 48 |
| 24 | 61 | 48 |
| 25 | 61 | 49 |
| 26 | 62 | 49 |
| 27 | 62 | 49 |
| 28 | 62 | 49 |
| 29 | 62 | 49 |
| 30 | 62 | 49 |
| 31 | 62 | 49 |
How May really feels in Mount Vernon
Once humidity and wind are folded in, May averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Mount Vernon weather by month
How May compares with the rest of the year at a glance. May is the 5th-warmest and 8th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 42° / 34° | 10.2 | 19.1 | 9.5 | 8.6 | 0.2 |
| Feb | 44° / 34° | 6.7 | 15.4 | 9 | 9.9 | 0.7 |
| Mar | 48° / 37° | 8.1 | 19.7 | 9.8 | 11.6 | 1.4 |
| Apr | 53° / 41° | 5.8 | 16.6 | 4 | 13.4 | 2.5 |
| May | 60° / 47° | 4.1 | 12.8 | 0.7 | 15 | 4.4 |
| Jun | 64° / 51° | 3.1 | 10.9 | 0 | 15.8 | 5.5 |
| Jul | 70° / 55° | 1.5 | 5.6 | 0 | 15.5 | 7.4 |
| Aug | 71° / 56° | 1.8 | 5.7 | 0 | 14.1 | 7.5 |
| Sep | 65° / 51° | 3.9 | 9.5 | 0 | 12.4 | 6.1 |
| Oct | 55° / 44° | 7.9 | 15.2 | 0.7 | 10.6 | 3.2 |
| Nov | 46° / 37° | 11.4 | 19.4 | 7.7 | 9 | 1.0 |
| Dec | 41° / 33° | 10.0 | 19 | 12.2 | 8.2 | 0.1 |
Cloud cover in May
The sky is clear or mostly clear about 21% of the time in May.
Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 63%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 38 | 38 | 39 | 39 | 38 | 39 | 39 | 40 | 40 | 39 | 39 | 39 | 38 | 38 | 37 | 36 | 35 | 35 | 35 | 35 | 34 | 34 | 35 | 35 | 35 | 35 | 35 | 36 | 36 | 35 | 35 |
| Cloudier (%) | 62 | 62 | 61 | 61 | 62 | 61 | 61 | 60 | 60 | 61 | 61 | 61 | 62 | 62 | 63 | 64 | 65 | 65 | 65 | 65 | 66 | 66 | 65 | 65 | 65 | 65 | 65 | 64 | 64 | 65 | 65 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 38 | 62 |
| 2 | 38 | 62 |
| 3 | 39 | 61 |
| 4 | 39 | 61 |
| 5 | 38 | 62 |
| 6 | 39 | 61 |
| 7 | 39 | 61 |
| 8 | 40 | 60 |
| 9 | 40 | 60 |
| 10 | 39 | 61 |
| 11 | 39 | 61 |
| 12 | 39 | 61 |
| 13 | 38 | 62 |
| 14 | 38 | 62 |
| 15 | 37 | 63 |
| 16 | 36 | 64 |
| 17 | 35 | 65 |
| 18 | 35 | 65 |
| 19 | 35 | 65 |
| 20 | 35 | 65 |
| 21 | 34 | 66 |
| 22 | 34 | 66 |
| 23 | 35 | 65 |
| 24 | 35 | 65 |
| 25 | 35 | 65 |
| 26 | 35 | 65 |
| 27 | 35 | 65 |
| 28 | 36 | 64 |
| 29 | 36 | 64 |
| 30 | 35 | 65 |
| 31 | 35 | 65 |
Chance of precipitation in May
Mount Vernon gets around 4.1 in of rain and snow over 12.8 wet days in May. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 41% and peaks near 49% on the wettest days, and about 1 day brings snow. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 49 | 48 | 47 | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 41 | 40 | 40 | 40 | 40 | 39 | 39 | 39 | 39 | 39 | 39 | 40 | 40 | 40 | 40 | 39 | 39 | 39 | 39 | 39 | 39 |
| Snow chance (%) | 6 | 6 | 6 | 6 | 5 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 49 | 6 |
| 2 | 48 | 6 |
| 3 | 47 | 6 |
| 4 | 47 | 6 |
| 5 | 46 | 5 |
| 6 | 45 | 5 |
| 7 | 44 | 5 |
| 8 | 43 | 4 |
| 9 | 42 | 4 |
| 10 | 41 | 4 |
| 11 | 41 | 3 |
| 12 | 40 | 3 |
| 13 | 40 | 2 |
| 14 | 40 | 2 |
| 15 | 40 | 2 |
| 16 | 39 | 2 |
| 17 | 39 | 1 |
| 18 | 39 | 1 |
| 19 | 39 | 1 |
| 20 | 39 | 1 |
| 21 | 39 | 1 |
| 22 | 40 | 1 |
| 23 | 40 | 1 |
| 24 | 40 | 1 |
| 25 | 40 | 0 |
| 26 | 39 | 0 |
| 27 | 39 | 0 |
| 28 | 39 | 0 |
| 29 | 39 | 0 |
| 30 | 39 | 0 |
| 31 | 39 | 0 |
Humidity in May
Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, May lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 99 | 98 | 98 | 98 | 98 | 97 | 97 | 97 | 96 | 96 | 96 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 4 | 4 | 4 |
| Dry (%) | Comfortable (%) | |
|---|---|---|
| 1 | 100 | 0 |
| 2 | 100 | 0 |
| 3 | 100 | 0 |
| 4 | 100 | 0 |
| 5 | 100 | 0 |
| 6 | 100 | 0 |
| 7 | 100 | 0 |
| 8 | 100 | 0 |
| 9 | 100 | 0 |
| 10 | 100 | 0 |
| 11 | 100 | 0 |
| 12 | 100 | 0 |
| 13 | 100 | 0 |
| 14 | 99 | 1 |
| 15 | 99 | 1 |
| 16 | 99 | 1 |
| 17 | 99 | 1 |
| 18 | 99 | 1 |
| 19 | 99 | 1 |
| 20 | 99 | 1 |
| 21 | 99 | 1 |
| 22 | 98 | 2 |
| 23 | 98 | 2 |
| 24 | 98 | 2 |
| 25 | 98 | 2 |
| 26 | 97 | 3 |
| 27 | 97 | 3 |
| 28 | 97 | 3 |
| 29 | 96 | 4 |
| 30 | 96 | 4 |
| 31 | 96 | 4 |
Wind in May
Winds average 4 mph in May.
Across May, 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.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 4 | calm |
| 2 | 4 | calm |
| 3 | 4 | calm |
| 4 | 4 | calm |
| 5 | 4 | calm |
| 6 | 4 | calm |
| 7 | 4 | calm |
| 8 | 4 | calm |
| 9 | 4 | calm |
| 10 | 4 | calm |
| 11 | 4 | calm |
| 12 | 4 | calm |
| 13 | 4 | calm |
| 14 | 4 | calm |
| 15 | 4 | calm |
| 16 | 4 | calm |
| 17 | 4 | calm |
| 18 | 4 | calm |
| 19 | 4 | calm |
| 20 | 4 | calm |
| 21 | 4 | calm |
| 22 | 4 | calm |
| 23 | 4 | calm |
| 24 | 4 | calm |
| 25 | 4 | calm |
| 26 | 4 | calm |
| 27 | 4 | calm |
| 28 | 4 | calm |
| 29 | 4 | calm |
| 30 | 4 | calm |
| 31 | 4 | calm |
Sunrise & sunset in May
Daylight runs from about 14 h 18 min at the start of May to 15 h 36 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 78 minutes over May. Sunrise moves from 4:59 AM to 4:20 AM, and sunset from 7:14 PM to 7:53 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 14.3 | 14.3 | 14.4 | 14.4 | 14.5 | 14.5 | 14.6 | 14.6 | 14.7 | 14.7 | 14.8 | 14.8 | 14.9 | 14.9 | 15.0 | 15.0 | 15.0 | 15.1 | 15.1 | 15.2 | 15.2 | 15.2 | 15.3 | 15.3 | 15.4 | 15.4 | 15.4 | 15.5 | 15.5 | 15.5 | 15.6 |
| Sunrise (AM) | 4:59 | 4:57 | 4:55 | 4:54 | 4:52 | 4:50 | 4:49 | 4:47 | 4:46 | 4:44 | 4:43 | 4:41 | 4:40 | 4:38 | 4:37 | 4:36 | 4:34 | 4:33 | 4:32 | 4:31 | 4:30 | 4:28 | 4:27 | 4:26 | 4:25 | 4:24 | 4:23 | 4:23 | 4:22 | 4:21 | 4:20 |
| Sunset (PM) | 7:14 | 7:16 | 7:17 | 7:19 | 7:20 | 7:22 | 7:23 | 7:24 | 7:26 | 7:27 | 7:29 | 7:30 | 7:31 | 7:33 | 7:34 | 7:35 | 7:37 | 7:38 | 7:39 | 7:41 | 7:42 | 7:43 | 7:44 | 7:46 | 7:47 | 7:48 | 7:49 | 7:50 | 7:51 | 7:52 | 7:53 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 14.3 | 4:59 | 7:14 |
| 2 | 14.3 | 4:57 | 7:16 |
| 3 | 14.4 | 4:55 | 7:17 |
| 4 | 14.4 | 4:54 | 7:19 |
| 5 | 14.5 | 4:52 | 7:20 |
| 6 | 14.5 | 4:50 | 7:22 |
| 7 | 14.6 | 4:49 | 7:23 |
| 8 | 14.6 | 4:47 | 7:24 |
| 9 | 14.7 | 4:46 | 7:26 |
| 10 | 14.7 | 4:44 | 7:27 |
| 11 | 14.8 | 4:43 | 7:29 |
| 12 | 14.8 | 4:41 | 7:30 |
| 13 | 14.9 | 4:40 | 7:31 |
| 14 | 14.9 | 4:38 | 7:33 |
| 15 | 15.0 | 4:37 | 7:34 |
| 16 | 15.0 | 4:36 | 7:35 |
| 17 | 15.0 | 4:34 | 7:37 |
| 18 | 15.1 | 4:33 | 7:38 |
| 19 | 15.1 | 4:32 | 7:39 |
| 20 | 15.2 | 4:31 | 7:41 |
| 21 | 15.2 | 4:30 | 7:42 |
| 22 | 15.2 | 4:28 | 7:43 |
| 23 | 15.3 | 4:27 | 7:44 |
| 24 | 15.3 | 4:26 | 7:46 |
| 25 | 15.4 | 4:25 | 7:47 |
| 26 | 15.4 | 4:24 | 7:48 |
| 27 | 15.4 | 4:23 | 7:49 |
| 28 | 15.5 | 4:23 | 7:50 |
| 29 | 15.5 | 4:22 | 7:51 |
| 30 | 15.5 | 4:21 | 7:52 |
| 31 | 15.6 | 4:20 | 7:53 |
Solar energy in May
Average shortwave solar energy reaching the ground each day in May, about 5.39 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 — May's 5.39 kWh/m² falls in the middle.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.1 | 5.2 | 5.2 | 5.2 | 5.3 | 5.3 | 5.3 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 | 5.4 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.1 | Bright |
| 2 | 5.2 | Bright |
| 3 | 5.2 | Bright |
| 4 | 5.2 | Bright |
| 5 | 5.3 | Bright |
| 6 | 5.3 | Bright |
| 7 | 5.3 | Bright |
| 8 | 5.4 | Bright |
| 9 | 5.4 | Bright |
| 10 | 5.4 | Bright |
| 11 | 5.4 | Bright |
| 12 | 5.4 | Bright |
| 13 | 5.4 | Bright |
| 14 | 5.4 | Bright |
| 15 | 5.4 | Bright |
| 16 | 5.4 | Bright |
| 17 | 5.4 | Bright |
| 18 | 5.4 | Bright |
| 19 | 5.4 | Bright |
| 20 | 5.4 | Bright |
| 21 | 5.4 | Bright |
| 22 | 5.4 | Bright |
| 23 | 5.4 | Bright |
| 24 | 5.4 | Bright |
| 25 | 5.4 | Bright |
| 26 | 5.4 | Bright |
| 27 | 5.4 | Bright |
| 28 | 5.4 | Bright |
| 29 | 5.4 | Bright |
| 30 | 5.4 | Bright |
| 31 | 5.4 | Bright |
Hazard calendar for Mount Vernon
None of Mount Vernon's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Mount Vernon's rainy season runs October–April, when most of the year's rain falls.
Is May a good time to visit Mount Vernon?
Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
May is a reasonable time to visit Mount Vernon for sightseeing.
What to pack for Mount Vernon in May
From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In May, Mount Vernon sees daytime highs around 60°F and nights near 47°F. Worth packing: a warm layer, rain gear and sun protection. About 13 days see rain.
Sea temperature near Mount Vernon in May
The nearest coast averages about 50°F in May — 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 46 | 46 | 47 | 48 | 50 | 52 | 53 | 54 | 53 | 50 | 49 | 47 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 46 | Bracing |
| Feb | 46 | Bracing |
| Mar | 47 | Bracing |
| Apr | 48 | Bracing |
| May | 50 | Bracing |
| Jun | 52 | Bracing |
| Jul | 53 | Bracing |
| Aug | 54 | Bracing |
| Sep | 53 | Bracing |
| Oct | 50 | Bracing |
| Nov | 49 | Bracing |
| Dec | 47 | Bracing |
UV index in Mount Vernon in May
Clear-sky midday UV in May peaks around 7 — enough to warrant sun protection. 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.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 1 | 4 | 5 | 7 | 6 | 8 | 6 | 4 | 3 | 1 | 1 |
| Level | Low | Low | Moderate | Moderate | High | High | Very high | High | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 1 | Low |
| Mar | 4 | Moderate |
| Apr | 5 | Moderate |
| May | 7 | High |
| Jun | 6 | High |
| Jul | 8 | Very high |
| Aug | 6 | High |
| Sep | 4 | Moderate |
| Oct | 3 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Air quality in Mount Vernon in May
Average fine-particle pollution (PM2.5) through the year — so you can see where May 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).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 7 | 9 | 12 | 12 | 12 | 11 | 11 | 18 | 18 | 12 | 7 | 6 |
| Level | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 7 | Good |
| Feb | 9 | Good |
| Mar | 12 | Good |
| Apr | 12 | Good |
| May | 12 | Good |
| Jun | 11 | Good |
| Jul | 11 | Good |
| Aug | 18 | Moderate |
| Sep | 18 | Moderate |
| Oct | 12 | Good |
| Nov | 7 | Good |
| Dec | 6 | Good |
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.
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
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).