Climate and monthly weather forecastMount Vernon, OR
Climate and monthly weather forecast
Weather in January
January, like December, in Mount Vernon, Oregon, is another cold winter month, with an average temperature varying between 35.2°F (1.8°C) and 22.1°F (-5.5°C). Mount Vernon signifies an average high-temperature of a still icy 35.2°F (1.8°C) in January, closely mirroring the 33.4°F (0.8°C) of December. Weather in January »Weather in February
February, the last month of the winter in Mount Vernon, is also a wintry month, with an average temperature varying between 22.5°F (-5.3°C) and 36.3°F (2.4°C). February's beginning signals an average high-temperature of a still cold 36.3°F (2.4°C), barely different from January's 35.2°F (1.8°C). Weather in February »Weather in March
March, the first month of the spring in Mount Vernon, is also an icy month, with an average temperature fluctuating between 42.6°F (5.9°C) and 26.2°F (-3.2°C). Mount Vernon's transition into March is noticed by a slight rise in the average high-temperature, advancing from 36.3°F (2.4°C) in February to a still wintry 42.6°F (5.9°C). Weather in March »Weather in April
April in Mount Vernon, Oregon, is a fresh spring month, with an average temperature fluctuating between 50.4°F (10.2°C) and 29.3°F (-1.5°C). The arrival of April brings a soft temperature shift, with the average high-temperature nudging from a wintry 42.6°F (5.9°C) in March to a fresh 50.4°F (10.2°C). Weather in April »Weather in May
May, the last month of the spring in Mount Vernon, is an enjoyable month, with an average temperature fluctuating between 36.1°F (2.3°C) and 61.3°F (16.3°C). May's arrival sees a rise in the average high-temperature, jumping from April's fresh 50.4°F (10.2°C) to a refreshing 61.3°F (16.3°C). Weather in May »Weather in June
The first month of the summer, June, is an agreeable month in Mount Vernon, Oregon, with temperature in the range of an average high of 69.4°F (20.8°C) and an average low of 41.2°F (5.1°C). The coming of June brings a minor shift in Mount Vernon's weather, with average high-temperatures adjusting from May's comfortable 61.3°F (16.3°C) to an agreeable 69.4°F (20.8°C). Weather in June »Weather in July
July in Mount Vernon, Oregon, is a moderately hot summer month, with temperature in the range of an average low of 48.4°F (9.1°C) and an average high of 81.7°F (27.6°C). July is the warmest month of the year, registering average temperatures as high as 81.7°F (27.6°C) and as low as 48.4°F (9.1°C). July's heat index is computed to be 82.4°F (28°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Mount Vernon, Oregon, with an average temperature fluctuating between 49.6°F (9.8°C) and 81°F (27.2°C). August registers an average high-temperature of a still moderately hot 81°F (27.2°C), slightly varied from July's 81.7°F (27.6°C). Weather in August »Weather in September
September, the first month of the autumn in Mount Vernon, is also an agreeable month, with an average temperature ranging between max 71.2°F (21.8°C) and min 44.2°F (6.8°C). Arrival of September comes with a reduction in the average high-temperature, falling from a moderately hot 81°F (27.2°C) in August to an agreeable 71.2°F (21.8°C). Weather in September »Weather in October
October, the same as September, in Mount Vernon, Oregon, is another refreshing autumn month, with an average temperature fluctuating between 56.3°F (13.5°C) and 35.6°F (2°C). With the onset of October, Mount Vernon's average high-temperature experiences a noticeable drop, receding from September's pleasant 71.2°F (21.8°C) to a moderate 56.3°F (13.5°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Mount Vernon, Oregon, with an average temperature varying between 27.5°F (-2.5°C) and 43°F (6.1°C). With November's onset, the weather shows a temperature decrease, transitioning from a refreshing 56.3°F (13.5°C) in October to a chilly 43°F (6.1°C). Weather in November »Weather in December
December, the first month of the winter in Mount Vernon, is also an icy month, with an average temperature varying between 19.6°F (-6.9°C) and 33.4°F (0.8°C). With average high temperatures of 33.4°F (0.8°C) and lows of 19.6°F (-6.9°C), December is the coldest month. Weather in December »Updated: Aug 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
In Mount Vernon, during the entire year, the rain falls for 127.7 days and collects up to 17.09" (434mm) of precipitation.
January through May, September through December are months with snowfall.
In Mount Vernon, during the entire year, snow falls for 62.5 days and aggregates up to 39.17" (995mm) of snow.
January and February, with an average of 5.2h of sunshine, are months with the least sunshine.
The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2.
With an average relative humidity of 85%, February is the most humid month.
The month with the most rainfall is February, when the rain falls for 11.9 days and typically aggregates up to 2.28" (58mm) of precipitation.
February is the month with the most snowfall. Snow falls for 12.5 days and accumulates 10.31" (262mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from PST to PDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from PDT to PST.
In Mount Vernon, snow does not fall in June through August.
The month with the longest days is June, with an average of 15h and 30min of daylight.
July, marked by an average high-temperature of 81.7°F (27.6°C) and a low-temperature of 48.4°F (9.1°C), is the warmest month.
The month with the least rainfall is July, when the rain falls for 3.8 days and typically collects 0.24" (6mm) of precipitation.
The month with the highest UV index is July, with an average maximum UV index of 6.
The least humid month is August, with an average relative humidity of 42%.
August has the most sunshine of the year, with an average of 12.1h of sunshine.
December tends to be the coldest month, with temperatures averaging a daily high of 33.4°F (0.8°C) and a low of 19.6°F (-6.9°C).
The month with the shortest days is December, with an average of 8h and 54min of daylight.
Average temperature
Mount Vernon, OR
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (33.4°F).
The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (19.6°F).
Average pressure
Mount Vernon, OR
- Average pressure in January:
30.22"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
30.01"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.94"Hg
- Average pressure in July:
29.95"Hg - Average pressure in August:
29.93"Hg - Average pressure in September:
29.97"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.19"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed
Mount Vernon, OR
- Average wind speed in January:
6mph - Average wind speed in February:
5.7mph - Average wind speed in March:
6.1mph - Average wind speed in April:
6.2mph - Average wind speed in May:
5.7mph - Average wind speed in June:
5.6mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are August and September (5mph).
Average humidity
Mount Vernon, OR
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is August (42%).
Average rainfall
Mount Vernon, OR
- Average rainfall in January:
2.17" - Average rainfall in February:
2.28" - Average rainfall in March:
2.17" - Average rainfall in April:
1.85" - Average rainfall in May:
1.65" - Average rainfall in June:
0.94"
- Average rainfall in July:
0.24" - Average rainfall in August:
0.28" - Average rainfall in September:
0.55" - Average rainfall in October:
1.3" - Average rainfall in November:
1.42" - Average rainfall in December:
2.24"
The wettest month (with the highest rainfall) is February (2.28").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days
Mount Vernon, OR
- Average rainfall days in January:
12.3 days - Average rainfall days in February:
11.9 days - Average rainfall days in March:
17.3 days - Average rainfall days in April:
14.9 days - Average rainfall days in May:
14.8 days - Average rainfall days in June:
8.9 days
- Average rainfall days in July:
3.8 days - Average rainfall days in August:
3.3 days - Average rainfall days in September:
6.6 days - Average rainfall days in October:
11.5 days - Average rainfall days in November:
11.3 days - Average rainfall days in December:
11.1 days
The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (3.3 days).
Average snowfall
Mount Vernon, OR
- Average snowfall in January:
8.11" - Average snowfall in February:
10.31" - Average snowfall in March:
5.83" - Average snowfall in April:
1.69" - Average snowfall in May:
0.28" - Average snowfall in June:
0"
The month with the highest snowfall is February (10.31").
The months with the least snowfall are June, July and August (0").
Average snowfall days
Mount Vernon, OR
- Average snowfall days in January:
11.7 days - Average snowfall days in February:
12.5 days - Average snowfall days in March:
9.6 days - Average snowfall days in April:
4.6 days - Average snowfall days in May:
1.3 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0.2 days - Average snowfall days in October:
1.3 days - Average snowfall days in November:
6.8 days - Average snowfall days in December:
14.5 days
The month with the highest number of snowfall days is December (14.5 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight / Average sunshine
Mount Vernon, OR
- Average daylight in January:
9h and 18min - Average daylight in February:
10h and 30min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 48min - Average daylight in June:
15h and 30min
- Average daylight in July:
15h and 6min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 36min - Average daylight in December:
8h and 54min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in January:
5h and 12min - Average sunshine in February:
5h and 12min - Average sunshine in March:
7h and 24min - Average sunshine in April:
10h and 12min - Average sunshine in May:
10h and 48min - Average sunshine in June:
11h and 24min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 6min - Average sunshine in September:
10h and 42min - Average sunshine in October:
7h and 6min - Average sunshine in November:
6h and 12min - Average sunshine in December:
5h and 18min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).
Average sunshine days
Mount Vernon, OR
- Average sunshine days in January:
13.5 days - Average sunshine days in February:
9 days - Average sunshine days in March:
9.2 days - Average sunshine days in April:
11.8 days - Average sunshine days in May:
13.8 days - Average sunshine days in June:
18.9 days
- Average sunshine days in July:
24.9 days - Average sunshine days in August:
24.8 days - Average sunshine days in September:
21.8 days - Average sunshine days in October:
18.1 days - Average sunshine days in November:
14.5 days - Average sunshine days in December:
11.4 days
The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is February (9 days).
Average UV index
Mount Vernon, OR
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).
Average cloud cover
Mount Vernon, OR
The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility
Mount Vernon, OR
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
