Climate and monthly weather forecast
Mount Vernon, OR

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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

Frequently asked questions

How much does it rain?

In Mount Vernon, during the entire year, the rain falls for 127.7 days and collects up to 17.09" (434mm) of precipitation.

When does it snow in Mount Vernon?

January through May, September through December are months with snowfall.

How many days does it snow?

In Mount Vernon, during the entire year, snow falls for 62.5 days and aggregates up to 39.17" (995mm) of snow.

What is the month with the least sunshine?

January and February, with an average of 5.2h of sunshine, are months with the least sunshine.

What is the month with the lowest UV index?

The months with the lowest UV index are January through March, October through December, with an average maximum UV index of 2.

What is the most humid month?

With an average relative humidity of 85%, February is the most humid month.

What is the rainiest 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.

When does it snow the most?

February is the month with the most snowfall. Snow falls for 12.5 days and accumulates 10.31" (262mm) of snow.

When is Daylight Saving Time (DST)?

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.

When it does not snow?

In Mount Vernon, snow does not fall in June through August.

When are the longest days?

The month with the longest days is June, with an average of 15h and 30min of daylight.

What month is the hottest?

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.

What is the driest 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.

What is the month with the highest UV index?

The month with the highest UV index is July, with an average maximum UV index of 6.

What is the least humid month?

The least humid month is August, with an average relative humidity of 42%.

What month has the most sunshine?

August has the most sunshine of the year, with an average of 12.1h of sunshine.

What is the coldest time of year?

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).

What is the month with the shortest days?

The month with the shortest days is December, with an average of 8h and 54min of daylight.

Average temperature
Mount Vernon, OR

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 - Mount Vernon, OR

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 - Mount Vernon, OR

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

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 - Mount Vernon, OR

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 - Mount Vernon, OR

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 - Mount Vernon, OR

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 - Mount Vernon, OR

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 / Average sunshine - Mount Vernon, OR

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).

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 - Mount Vernon, OR

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

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 visibility
Mount Vernon, OR

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).

Mount Vernon, Oregon, USA

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