Climate and monthly weather forecast
Washington, PA

Weather in January

January, like December, in Washington, Pennsylvania, is another cold winter month, with temperature in the range of an average low of 20.8°F (-6.2°C) and an average high of 33.6°F (0.9°C). With an average high-temperature of 33.6°F (0.9°C) and an average low-temperature of 20.8°F (-6.2°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter, in Washington, is another cold month, with temperature in the range of an average low of 23.7°F (-4.6°C) and an average high of 38.3°F (3.5°C). In Washington, Pennsylvania, the average high-temperature is relatively the same as in January - a still cold 38.3°F (3.5°C). Weather in February »

Weather in March

March, the first month of the spring, in Washington, is a chilly month, with average temperature fluctuating between 48.6°F (9.2°C) and 31.5°F (-0.3°C). In March, the average high-temperature rises, from a wintry 38.3°F (3.5°C) in February, to a frosty 48.6°F (9.2°C). Weather in March »

Weather in April

April in Washington, Pennsylvania, is an enjoyable spring month, with temperature in the range of an average low of 41.2°F (5.1°C) and an average high of 61.3°F (16.3°C). In Washington, the average high-temperature increases, from a frosty 48.6°F (9.2°C) in March, to an enjoyable 61.3°F (16.3°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Washington, Pennsylvania, with average temperature ranging between min 51.4°F (10.8°C) and max 72.1°F (22.3°C). In May, the average high-temperature increases, from a comfortable 61.3°F (16.3°C) in April, to an agreeable 72.1°F (22.3°C). Weather in May »

Weather in June

June, the first month of the summer, in Washington, is a moderately hot month, with average temperature fluctuating between 78.8°F (26°C) and 57.7°F (14.3°C). In June, the average high-temperature marginally rises, from a pleasant 72.1°F (22.3°C) in May, to a moderately hot 78.8°F (26°C). Weather in June »

Weather in July

July, like June, in Washington, Pennsylvania, is another warm summer month, with average temperature varying between 61.9°F (16.6°C) and 83.3°F (28.5°C). The warmest month is July, with an average high-temperature of 83.3°F (28.5°C) and an average low-temperature of 61.9°F (16.6°C). The average heat index is estimated at a hot 91°F (32.8°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Washington, Pennsylvania, with average temperature ranging between min 59.9°F (15.5°C) and max 82°F (27.8°C). In Washington, the average high-temperature is relatively the same as in July - a still moderately hot 82°F (27.8°C). Weather in August »

Weather in September

September, the first month of the autumn, in Washington, is also a moderately hot month, with average temperature varying between 75.7°F (24.3°C) and 54.9°F (12.7°C). In September, the average high-temperature slightly decreases, from 82°F (27.8°C) in August, to a still moderately hot 75.7°F (24.3°C). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in Washington, Pennsylvania, with temperature in the range of an average high of 62.4°F (16.9°C) and an average low of 45°F (7.2°C). In Washington, the average high-temperature decreases, from a moderately hot 75.7°F (24.3°C) in September, to an enjoyable 62.4°F (16.9°C). Weather in October »

Weather in November

November, the last month of the autumn, in Washington, is also a frosty month, with temperature in the range of an average low of 33.8°F (1°C) and an average high of 49.5°F (9.7°C). In November, the average high-temperature drops, from an enjoyable 62.4°F (16.9°C) in October, to a frosty 49.5°F (9.7°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Washington, Pennsylvania, with average temperature varying between 40.1°F (4.5°C) and 28.6°F (-1.9°C). In December, the average high-temperature decreases, from a chilly 49.5°F (9.7°C) in November, to a wintry 40.1°F (4.5°C). Weather in December »
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FAQ

What is the coldest month in Washington?

The coldest month is January, with an average high-temperature of 33.6°F (0.9°C) and an average low-temperature of 20.8°F (-6.2°C).

What is the driest month in Washington?

January and November are months with the least rain in Washington when the rain falls for 7.5 days and typically aggregates up to 0.94" (24mm) of rain.

How much does it rain in Washington?

Throughout the year, there are 143 rainfall days, and 14.8" (376mm) of precipitation is accumulated.

When does it snow in Washington?

January through May, October through December are months with snowfall in Washington, Pennsylvania.

How many days does it snow in Washington?

In Washington, Pennsylvania, during the entire year, snow falls for 33.5 days, and aggregates up to 4.88" (124mm) of snow.

What is the month with the least sunshine in Washington?

With an average of 3h of sunshine, January has the least sunshine of the year in Washington, Pennsylvania.

What is the most humid month in Washington?

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

When does it snow the most in Washington?

The month with the most snowfall is February when snow falls for 8.1 days and typically aggregates up to 1.26" (32mm) of snow.

What is the least humid month in Washington?

April, July and August, with an average relative humidity of 77%, are the least humid months.

When it does not snow in Washington?

June through September are months without snowfall in Washington, Pennsylvania.

When are the longest days in Washington?

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

When is the highest UV index in Washington?

Months with the highest UV index in Washington are June through August, with an average maximum UV index of 6.

What is the warmest month in Washington?

The warmest month is July, with an average high-temperature of 83.3°F (28.5°C) and an average low-temperature of 61.9°F (16.6°C).

What is the rainiest month in Washington?

July is the month with the most rainfall. Rain falls for 15.8 days and accumulates 1.65" (42mm) of precipitation.

What month has the most sunshine in Washington?

August has the most sunshine of the year in Washington, with an average of 10.2h of sunshine.

What is the month with the shortest days in Washington?

December has the shortest days of the year, with an average of 9.4h of daylight.

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

The month with the lowest UV index is December, with an average maximum UV index of 1.

Average pressure
Washington, PA

Average pressure - Washington, PA

The month with the highest atmospheric pressure is November (1020.5mbar).
The month with the lowest atmospheric pressure is June (1014.2mbar).

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Average wind speed
Washington, PA

Average wind speed - Washington, PA

The windiest month (with the highest average wind speed) is January (12.5km/h).
The calmest month (with the lowest average wind speed) is August (7.3km/h).

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Average humidity
Washington, PA

Average humidity - Washington, PA

The month with the highest relative humidity is February (85%).
Months with the lowest relative humidity are April, July and August (77%).

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Average rainfall
Washington, PA

Average rainfall - Washington, PA

The wettest month (with the highest rainfall) is July (42mm).
The driest months (with the least rainfall) are January and November (24mm).

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Average rainfall days
Washington, PA

Average rainfall days - Washington, PA

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is February (7.3 days).

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Average snowfall
Washington, PA

Average snowfall - Washington, PA

The month with the highest snowfall is February (32mm).
Months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days
Washington, PA

Average snowfall days - Washington, PA

The month with the highest number of snowfall days is January (9.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Washington, PA

Average daylight / Average sunshine - Washington, PA

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

The month with the most sunshine is August (Average sunshine: 10.2h).
The month with the least sunshine is January (Average sunshine: 3h).

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Average sunshine days
Washington, PA

Average sunshine days - Washington, PA

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is May (11.8 days).

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Average visibility
Washington, PA

Average visibility - Washington, PA

Months with the highest visibility are April and November (9km).
Months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (8km).

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