Climate and monthly weather forecast
Prosser, WA

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Weather in January

January, like December, in Prosser, Washington, is another cold winter month, with an average temperature fluctuating between 27.9°F (-2.3°C) and 37.9°F (3.3°C). Prosser marks the arrival of January with an average high-temperature of a still icy 37.9°F (3.3°C), hardly different from December's 37.2°F (2.9°C). Weather in January »

Weather in February

February, the last month of the winter in Prosser, is a chilly month, with temperature in the range of an average high of 43.5°F (6.4°C) and an average low of 31.1°F (-0.5°C). The coming of February brings a minor shift in Prosser's weather, with average high-temperatures adjusting from January's wintry 37.9°F (3.3°C) to a chilly 43.5°F (6.4°C). Weather in February »

Weather in March

March, the first month of the spring in Prosser, is a cool month, with an average temperature ranging between min 37°F (2.8°C) and max 52.9°F (11.6°C). March sees a rise in the average high-temperature, climbing from a chilly 43.5°F (6.4°C) in February to a cool 52.9°F (11.6°C). Weather in March »

Weather in April

April is a comfortable spring month in Prosser, Washington, with an average temperature fluctuating between 42.6°F (5.9°C) and 62.2°F (16.8°C). A rise in the average high-temperature is observed during April, moving from a cool 52.9°F (11.6°C) in March to a refreshing 62.2°F (16.8°C). Weather in April »

Weather in May

May, the last month of the spring in Prosser, is an agreeable month, with an average temperature ranging between min 50.2°F (10.1°C) and max 71.8°F (22.1°C). Prosser's weather in May presents a rise in the average high-temperature, moving from a refreshing 62.2°F (16.8°C) in April to a pleasant 71.8°F (22.1°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Prosser, Washington, with an average temperature ranging between max 78.6°F (25.9°C) and min 55.9°F (13.3°C). June's arrival brings a modest temperature shift, moving from a pleasant 71.8°F (22.1°C) in May to a moderately hot 78.6°F (25.9°C). Weather in June »

Weather in July

July is a tropical summer month in Prosser, Washington, with an average temperature ranging between min 62.2°F (16.8°C) and max 88.3°F (31.3°C). July brings the highest temperatures, with an average high of 88.3°F (31.3°C) and an average low of 62.2°F (16.8°C). Weather in July »

Weather in August

August, the last month of the summer in Prosser, is another tropical month, with an average temperature varying between 63.1°F (17.3°C) and 87.4°F (30.8°C). The arrival of August sees a recorded average high-temperature of a still tropical 87.4°F (30.8°C), showing little divergence from the previous month's conditions. Weather in August »

Weather in September

September, the first month of the autumn in Prosser, is also a moderately hot month, with temperature in the range of an average high of 76.6°F (24.8°C) and an average low of 56.1°F (13.4°C). September's arrival comes with a decrease in the average high-temperature, moving from a tropical 87.4°F (30.8°C) in August to a moderately hot 76.6°F (24.8°C). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in Prosser, Washington, with an average temperature ranging between max 61.3°F (16.3°C) and min 45.9°F (7.7°C). As Prosser transitions into October, a marked decrease in the average high-temperature is observed, dropping from a moderately hot 76.6°F (24.8°C) in September to a refreshing 61.3°F (16.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Prosser, Washington, with an average temperature ranging between max 47.3°F (8.5°C) and min 35.1°F (1.7°C). November brings a drop in Prosser's average high-temperature, falling from a comfortable 61.3°F (16.3°C) in October to a frosty 47.3°F (8.5°C). Weather in November »

Weather in December

December, the first month of the winter in Prosser, is also a wintry month, with temperature in the range of an average low of 27°F (-2.8°C) and an average high of 37.2°F (2.9°C). In Prosser, the month of December registers the lowest temperatures, averaging 37.2°F (2.9°C) at the peak and 27°F (-2.8°C) at the lowest. Weather in December »
Resources | Updated: Feb 14, 2024 | Published by: Weather U.S.

Frequently asked questions

What is the most humid month in Prosser?

January is the most humid month, with an average relative humidity of 81%.

What is the wettest month in Prosser?

The wettest months in Prosser, Washington, are January and December, with an average 0.94" (24mm) of rainfall.

How much does it rain in Prosser?

In Prosser, Washington, during the entire year, the rain falls for 97.8 days and collects up to 7.44" (189mm) of precipitation.

When does it snow in Prosser?

January through March, September, November and December are months with snowfall in Prosser.

How much does it snow in Prosser?

In Prosser, during the entire year, snow falls for 13.5 days and aggregates up to 5.87" (149mm) of snow.

What is the month with the least sunshine in Prosser?

January has the least sunshine of the year in Prosser, with an average of 5.2h of sunshine.

When is the lowest UV index in Prosser?

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

When does it snow the most in Prosser?

February is the month with the most snowfall in Prosser, Washington. Snow falls for 3.4 days and accumulates 2.01" (51mm) of snow.

When is Daylight Saving Time (DST) in Prosser?

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 Prosser?

In Prosser, Washington, snow does not fall in April through August and October.

When are the longest days in Prosser?

With an average of 15h and 42min of daylight, June has the longest days of the year in Prosser, Washington.

What part of the year is the hottest in Prosser?

Prosser's July weather, with an average high temperature of 88.3°F (31.3°C) and an average low temperature of 62.2°F (16.8°C), tends to be the warmest of the year.

What is the least humid month in Prosser?

The months with the lowest humidity are July and August, with an average relative humidity of 37%.

What is the driest month in Prosser?

The month with the least rainfall is July, when the rain falls for 3.6 days and typically collects 0.2" (5mm) of precipitation.

What are the months with the most sunshine in Prosser?

The months with the most sunshine in Prosser, Washington, are July and August, with an average of 12h of sunshine.

When is the highest UV index in Prosser?

July is the month with the highest UV index, with an average maximum UV index of 7.

What month is the coldest in Prosser?

December stands out as Prosser's coldest month, with an average high-temperature of 37.2°F (2.9°C) and a low-temperature of 27°F (-2.8°C).

What is the month with the shortest days in Prosser?

With an average of 8h and 42min of daylight, December has the shortest days of the year in Prosser, Washington.

Average temperature
Prosser, WA

Average temperature - Prosser, WA

The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is December (37.2°F).

The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is December (27°F).

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Average pressure
Prosser, WA

Average pressure - Prosser, WA

The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

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Average wind speed
Prosser, WA

Average wind speed - Prosser, WA

The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is December (5.6mph).

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Average humidity
Prosser, WA

Average humidity - Prosser, WA

The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (37%).

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Average rainfall
Prosser, WA

Average rainfall - Prosser, WA

The wettest months (with the highest rainfall) are January and December (0.94").
The driest month (with the least rainfall) is July (0.2").

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Average rainfall days
Prosser, WA

Average rainfall days - Prosser, WA

The month with the highest number of rainy days is March (11.8 days).
The month with the least rainy days is July (3.6 days).

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Average snowfall
Prosser, WA

Average snowfall - Prosser, WA

The month with the highest snowfall is February (2.01").
The months with the least snowfall are April, May, June, July, August and October (0").

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Average snowfall days
Prosser, WA

Average snowfall days - Prosser, WA

The month with the highest number of snowfall days is December (4.6 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).

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Average daylight / Average sunshine
Prosser, WA

Average daylight / Average sunshine - Prosser, WA

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).

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Average sunshine days
Prosser, WA

Average sunshine days - Prosser, WA

The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is February (15.5 days).

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Average UV index
Prosser, WA

Average UV index - Prosser, WA

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average visibility
Prosser, WA

Average visibility - Prosser, WA

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

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Prosser, Washington, USA

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