Climate and monthly weather forecast
Summit, WA

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Weather in January

January, like December, is a frosty winter month in Summit, Washington, with temperature in the range of an average high of 44.4°F (6.9°C) and an average low of 33.8°F (1°C). With the onset of January, the average high-temperature stands at a still chilly 44.4°F (6.9°C), closely aligned with December's 42.8°F (6°C). Weather in January »

Weather in February

February, the last month of the winter in Summit, is also a frosty month, with temperature in the range of an average high of 45°F (7.2°C) and an average low of 33.1°F (0.6°C). In February, the average high-temperature registers at a still frosty 45°F (7.2°C), nearly identical to January's 44.4°F (6.9°C). Weather in February »

Weather in March

March, the first month of the spring in Summit, is also a frosty month, with an average temperature ranging between max 49.8°F (9.9°C) and min 35.2°F (1.8°C). Summit's transition from February to March introduces an average high-temperature of a still chilly 49.8°F (9.9°C), marking an insignificant variation from the 45°F (7.2°C). Weather in March »

Weather in April

April in Summit, Washington, is a fresh spring month, with temperature in the range of an average high of 55.2°F (12.9°C) and an average low of 38.3°F (3.5°C). April's onset brings a minor rise in the average high-temperature, moving from a frosty 49.8°F (9.9°C) in March to a cool 55.2°F (12.9°C). Weather in April »

Weather in May

The last month of the spring, May, is a refreshing month in Summit, Washington, with temperature in the range of an average high of 63.7°F (17.6°C) and an average low of 43°F (6.1°C). The shift into May is accompanied by a modest temperature increase, with the average high-temperature edging up from a cool 55.2°F (12.9°C) in April to a refreshing 63.7°F (17.6°C). Weather in May »

Weather in June

June, the first month of the summer in Summit, is an agreeable month, with an average temperature fluctuating between 68.5°F (20.3°C) and 46°F (7.8°C). In June, the average high-temperature registers at an agreeable 68.5°F (20.3°C), nearly identical to May's 63.7°F (17.6°C). Weather in June »

Weather in July

July in Summit, Washington, is a moderately hot summer month, with an average temperature ranging between max 76.3°F (24.6°C) and min 50.2°F (10.1°C). Summit's transition into July is marked by a minor temperature shift, moving from an agreeable 68.5°F (20.3°C) in June to a moderately hot 76.3°F (24.6°C). Weather in July »

Weather in August

August, the last month of the summer in Summit, is another warm month, with an average temperature varying between 51.6°F (10.9°C) and 76.5°F (24.7°C). Summit's August weather, marked by an average high temperature of 76.5°F (24.7°C) and an average low temperature of 51.6°F (10.9°C), is the warmest in the year. Weather in August »

Weather in September

September, the first month of the autumn in Summit, is also an agreeable month, with an average temperature varying between 48.6°F (9.2°C) and 69.6°F (20.9°C). The arrival of September corresponds with a light shift in temperature, down from a warm 76.5°F (24.7°C) in August to a pleasant 69.6°F (20.9°C). Weather in September »

Weather in October

October, like September, is another refreshing autumn month in Summit, Washington, with an average temperature ranging between max 58.3°F (14.6°C) and min 43.2°F (6.2°C). The onset of October entails a temperature shift, as the average high-temperature decreases from a pleasant 69.6°F (20.9°C) in September to a mild 58.3°F (14.6°C). Weather in October »

Weather in November

November, the last month of the autumn in Summit, is also a frosty month, with an average temperature ranging between min 37.8°F (3.2°C) and max 48.6°F (9.2°C). The beginning of November involves a decrease in the average high-temperature, transitioning from a refreshing 58.3°F (14.6°C) in October to a frosty 48.6°F (9.2°C). Weather in November »

Weather in December

The first month of the winter, December, is still a chilly month in Summit, Washington, with an average temperature fluctuating between 42.8°F (6°C) and 32.7°F (0.4°C). The coldest month is December, with an average high-temperature of 42.8°F (6°C) and an average low-temperature of 32.7°F (0.4°C). Weather in December »
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Frequently asked questions

What is the most humid month in Summit?

January is the most humid month in Summit, with an average relative humidity of 87%.

How much does it rain in Summit?

In Summit, Washington, during the entire year, the rain falls for 183.4 days and collects up to 32.48" (825mm) of precipitation.

When does it snow in Summit?

Months with snowfall in Summit are January through March, November and December.

How many days does it snow in Summit?

In Summit, during the entire year, snow falls for 7.4 days and aggregates up to 3.78" (96mm) of snow.

What is the month with the lowest UV index in Summit?

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

What is the snowiest month in Summit?

The month with the most snowfall in Summit is February, when snow falls for 2.7 days and typically aggregates up to 1.42" (36mm) of snow.

When is Daylight Saving Time (DST) in Summit?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Summit, Washington, 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 Summit?

In Summit, snow does not fall in April through October.

When are the longest days in Summit?

With an average of 15h and 54min of daylight, June has the longest days of the year.

What is the least humid month in Summit?

The least humid month in Summit is July, with an average relative humidity of 69%.

What is the driest month in Summit?

July is the month with the least rainfall. Rain falls for 7 days and accumulates 0.43" (11mm) of precipitation.

When is the highest UV index in Summit?

With an average maximum UV index of 5, July is the month with the highest UV index.

What month is the hottest in Summit?

August, having an average high-temperature of 76.5°F (24.7°C) and an average low-temperature of 51.6°F (10.9°C), is the warmest month in Summit, Washington.

What month has the most sunshine in Summit?

August has the most sunshine of the year in Summit, with an average of 10.9h of sunshine.

What month is the coldest in Summit?

In Summit, December records the average lowest temperatures, peaking at 42.8°F (6°C) and reaching a low of 32.7°F (0.4°C).

What is the rainiest month in Summit?

The month with the most rainfall is December, when the rain falls for 19.2 days and typically aggregates up to 4.92" (125mm) of precipitation.

What is the month with the shortest days in Summit?

The month with the shortest days is December, with an average of 8h and 36min of daylight.

What is the month with the least sunshine in Summit?

December has the least sunshine of the year in Summit, with an average of 4.2h of sunshine.

Average temperature
Summit, WA

Average temperature - Summit, WA

The warmest month (with the highest average high temperature) is August (76.5°F).
The month with the lowest average high temperature is December (42.8°F).

The month with the highest average low temperature is August (51.6°F).
The coldest month (with the lowest average low temperature) is December (32.7°F).

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Average pressure
Summit, WA

Average pressure - Summit, WA

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

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Average wind speed
Summit, WA

Average wind speed - Summit, WA

The windiest month (with the highest average wind speed) is March (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).

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Average rainfall
Summit, WA

Average rainfall - Summit, WA

The wettest month (with the highest rainfall) is December (4.92").
The driest month (with the least rainfall) is July (0.43").

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Average rainfall days
Summit, WA

Average rainfall days - Summit, WA

The month with the highest number of rainy days is March (21 days).
The month with the least rainy days is August (6.2 days).

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Average snowfall
Summit, WA

Average snowfall - Summit, WA

The month with the highest snowfall is February (1.42").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days
Summit, WA

Average snowfall days - Summit, WA

The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Summit, WA

Average daylight / Average sunshine - Summit, WA

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).

The month with the most sunshine is August (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).

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Average sunshine days
Summit, WA

Average sunshine days - Summit, WA

The month with the most sunshine days is August (22.3 days).
The month with the least sunshine days is February (8.2 days).

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Average UV index
Summit, WA

Average UV index - Summit, WA

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

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Average visibility
Summit, WA

Average visibility - Summit, WA

The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February, March, April, May, June, September, October, November and December (5mi).

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Summit, Washington, USA

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