Climate and monthly weather forecastProsser, WA
Climate and monthly weather forecast
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 »Updated: Feb 14, 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
January is the most humid month, with an average relative humidity of 81%.
The wettest months in Prosser, Washington, are January and December, with an average 0.94" (24mm) of rainfall.
In Prosser, Washington, during the entire year, the rain falls for 97.8 days and collects up to 7.44" (189mm) of precipitation.
January through March, September, November and December are months with snowfall in Prosser.
In Prosser, during the entire year, snow falls for 13.5 days and aggregates up to 5.87" (149mm) of snow.
January has the least sunshine of the year in Prosser, with an average of 5.2h of sunshine.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
February is the month with the most snowfall in Prosser, Washington. Snow falls for 3.4 days and accumulates 2.01" (51mm) 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 Prosser, Washington, snow does not fall in April through August and October.
With an average of 15h and 42min of daylight, June has the longest days of the year in Prosser, Washington.
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.
The months with the lowest humidity are July and August, with an average relative humidity of 37%.
The month with the least rainfall is July, when the rain falls for 3.6 days and typically collects 0.2" (5mm) of precipitation.
The months with the most sunshine in Prosser, Washington, are July and August, with an average of 12h of sunshine.
July is the month with the highest UV index, with an average maximum UV index of 7.
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).
With an average of 8h and 42min of daylight, December has the shortest days of the year in Prosser, Washington.
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).
Average pressure
Prosser, WA
- Average pressure in January:
30.18"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.93"Hg - Average pressure in August:
29.91"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.15"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed
Prosser, WA
- Average wind speed in January:
5.9mph - Average wind speed in February:
6.6mph - Average wind speed in March:
7.9mph - Average wind speed in April:
8.6mph - Average wind speed in May:
7.6mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.7mph - Average wind speed in August:
6.6mph - Average wind speed in September:
6.8mph - Average wind speed in October:
6.6mph - Average wind speed in November:
6.6mph - Average wind speed in December:
5.6mph
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).
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%).
Average rainfall
Prosser, WA
- Average rainfall in January:
0.94" - Average rainfall in February:
0.79" - Average rainfall in March:
0.79" - Average rainfall in April:
0.47" - Average rainfall in May:
0.83" - Average rainfall in June:
0.55"
- Average rainfall in July:
0.2" - Average rainfall in August:
0.31" - Average rainfall in September:
0.35" - Average rainfall in October:
0.75" - Average rainfall in November:
0.51" - Average rainfall in December:
0.94"
The wettest months (with the highest rainfall) are January and December (0.94").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days
Prosser, WA
- Average rainfall days in January:
10.4 days - Average rainfall days in February:
7.6 days - Average rainfall days in March:
11.8 days - Average rainfall days in April:
10.5 days - Average rainfall days in May:
9.3 days - Average rainfall days in June:
6.6 days
- Average rainfall days in July:
3.6 days - Average rainfall days in August:
4.2 days - Average rainfall days in September:
4.7 days - Average rainfall days in October:
9.9 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
9.7 days
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).
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").
Average snowfall days
Prosser, WA
- Average snowfall days in January:
3.1 days - Average snowfall days in February:
3.4 days - Average snowfall days in March:
0.9 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 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:
0.1 days - Average snowfall days in October:
0 days - Average snowfall days in November:
1.4 days - Average snowfall days in December:
4.6 days
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).
Average daylight / Average sunshine
Prosser, WA
- Average daylight in January:
9h and 6min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 0min - Average daylight in June:
15h and 42min
- Average daylight in July:
15h and 18min - Average daylight in August:
14h and 6min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 24min - Average daylight in December:
8h and 42min
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).
- Average sunshine in January:
5h and 12min - Average sunshine in February:
5h and 36min - Average sunshine in March:
7h and 42min - Average sunshine in April:
10h and 12min - Average sunshine in May:
11h and 0min - Average sunshine in June:
11h and 36min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 48min - Average sunshine in October:
6h and 42min - Average sunshine in November:
6h and 12min - Average sunshine in December:
5h and 30min
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).
Average sunshine days
Prosser, WA
- Average sunshine days in January:
17.7 days - Average sunshine days in February:
15.5 days - Average sunshine days in March:
16 days - Average sunshine days in April:
16.3 days - Average sunshine days in May:
19.4 days - Average sunshine days in June:
21.3 days
- Average sunshine days in July:
25.8 days - Average sunshine days in August:
24.2 days - Average sunshine days in September:
23.5 days - Average sunshine days in October:
19.8 days - Average sunshine days in November:
17.5 days - Average sunshine days in December:
16.5 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is February (15.5 days).
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).
Average cloud cover
Prosser, WA
The month with the most cloud cover is January (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 9).
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).
