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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January in Sumner, Washington, is a chilly winter month, with an average temperature varying between 43.3°F (6.3°C) and 33.1°F (0.6°C). With the transition into January, Sumner notes an average high-temperature of a frosty 43.3°F (6.3°C), closely resembling December. Weather in January »
Weather in February
The last month of the winter, February, is another chilly month in Sumner, Washington, with an average temperature varying between 32.5°F (0.3°C) and 43.7°F (6.5°C). February reports an average high-temperature of a still frosty 43.7°F (6.5°C), slightly varied from January's 43.3°F (6.3°C). Weather in February »
Weather in March
The first month of the spring, March, is also a frosty month in Sumner, Washington, with an average temperature fluctuating between 34.5°F (1.4°C) and 48.6°F (9.2°C). With the onset of March, a modest change to a still chilly 48.6°F (9.2°C) from February's 43.7°F (6.5°C) is noted in high-temperature. Weather in March »
Weather in April
April in Sumner, Washington, is a fresh spring month, with an average temperature ranging between min 37.2°F (2.9°C) and max 54°F (12.2°C). As April begins, there's a slight increase in the average high-temperature, moving from a chilly 48.6°F (9.2°C) in March to a fresh 54°F (12.2°C). Weather in April »
Weather in May
May, the last month of the spring in Sumner, is an enjoyable month, with an average temperature varying between 62.6°F (17°C) and 41.5°F (5.3°C). A slight uplift in the average high-temperature marks May, adjusting from April's fresh 54°F (12.2°C) to an enjoyable 62.6°F (17°C). Weather in May »
Weather in June
The first month of the summer, June, is still a comfortable month in Sumner, Washington, with temperature in the range of an average high of 67.3°F (19.6°C) and an average low of 45.1°F (7.3°C). The arrival of June sees an average high-temperature of a still enjoyable 67.3°F (19.6°C), hardly diverging from May's 62.6°F (17°C). Weather in June »
Weather in July
July in Sumner, Washington, is a warm summer month, with temperature in the range of an average high of 74.8°F (23.8°C) and an average low of 49.6°F (9.8°C). The average high-temperature mildly increases in July, edging from a refreshing 67.3°F (19.6°C) in June to a warm 74.8°F (23.8°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Sumner, Washington, with an average temperature fluctuating between 50.9°F (10.5°C) and 75.7°F (24.3°C). With average high temperatures of 75.7°F (24.3°C) and lows of 50.9°F (10.5°C), August is the warmest month. Weather in August »
Weather in September
September, the first month of the autumn in Sumner, is also an agreeable month, with an average temperature ranging between min 47.7°F (8.7°C) and max 68.9°F (20.5°C). September is characterized by a slight reduction in average high-temperature, easing from a moderately hot 75.7°F (24.3°C) in August to an agreeable 68.9°F (20.5°C). Weather in September »
Weather in October
October, the same as September, in Sumner, Washington, is another refreshing autumn month, with an average temperature varying between 57.4°F (14.1°C) and 42.4°F (5.8°C). The onset of October results in a decrease in the average high-temperature, receding from a pleasant 68.9°F (20.5°C) in September to a mild 57.4°F (14.1°C). Weather in October »
Weather in November
November, the last month of the autumn in Sumner, is another chilly month, with an average temperature fluctuating between 37°F (2.8°C) and 47.3°F (8.5°C). Sumner's weather changes with the onset of November, slightly falling from a mild 57.4°F (14.1°C) in October to a chilly 47.3°F (8.5°C). Weather in November »
Weather in December
December, the first month of the winter in Sumner, is also an icy month, with an average temperature fluctuating between 41.4°F (5.2°C) and 32°F (0°C). December is the month when Sumner sees the lowest average temperatures, with a high of 41.4°F (5.2°C) and a low of 32°F (0°C). Weather in December »
[Resources]Frequently asked questions
What is the most humid month in Sumner?
With an average relative humidity of 87%, January is the most humid month.
How much does it rain in Sumner?
Throughout the year, in Sumner, Washington, there are 185 rainfall days, and 35.71" (907mm) of precipitation is accumulated.
When does it snow in Sumner?
January through April, November and December are months with snowfall.
How many days does it snow in Sumner?
Throughout the year, there are 15.8 snowfall days, and 9.09" (231mm) of snow is accumulated.
When is the lowest UV index in Sumner?
The months with the lowest UV index in Sumner, Washington, are January, February, October through December, with an average maximum UV index of 2.
What is the snowiest month in Sumner?
February is the month with the most snowfall in Sumner, Washington. Snow falls for 5.3 days and accumulates 3.31" (84mm) of snow.
When is Daylight Saving Time (DST) in Sumner?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Sumner, 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 Sumner?
In Sumner, snow does not fall in May through October.
When are the longest days in Sumner?
With an average of 15h and 54min of daylight, June has the longest days of the year in Sumner.
What are the least humid months in Sumner?
The months with the lowest humidity in Sumner, Washington, are July and August, with an average relative humidity of 70%.
What is the driest month in Sumner?
July is the month with the least rainfall in Sumner. Rain falls for 7.6 days and accumulates 0.51" (13mm) of precipitation.
What is the month with the highest UV index in Sumner?
With an average maximum UV index of 5, July is the month with the highest UV index in Sumner, Washington.
What part of the year is the hottest in Sumner?
Sumner's warmest month, August, generally records average temperatures ranging from a high of 75.7°F (24.3°C) to a low of 50.9°F (10.5°C).
What month has the most sunshine in Sumner?
With an average of 10.9h of sunshine, August has the most sunshine of the year in Sumner, Washington.
What is the coldest time of year in Sumner?
The lowest temperatures in Sumner, Washington, are recorded in December, with averages reaching a high of 41.4°F (5.2°C) and a low of 32°F (0°C).
What is the wettest month in Sumner?
The month with the most rainfall is December, when the rain falls for 19.3 days and typically aggregates up to 5.35" (136mm) of precipitation.
What is the month with the shortest days in Sumner?
The month with the shortest days in Sumner is December, with an average of 8h and 36min of daylight.
What is the month with the least sunshine in Sumner?
The month with the least sunshine is December, with an average of 4.2h of sunshine.
Average temperature
Sumner, WA
The warmest month (with the highest average high temperature) is August (75.7°F).
The month with the lowest average high temperature is December (41.4°F).
The month with the highest average low temperature is August (50.9°F).
The coldest month (with the lowest average low temperature) is December (32°F).
Average pressure
Sumner, WA
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.06"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30.05"Hg - Average pressure in May:
30.02"Hg - Average pressure in June:
30.02"Hg
- Average pressure in July:
30.03"Hg - Average pressure in August:
30"Hg - Average pressure in September:
30.01"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.05"Hg - Average pressure in December:
30.09"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed
Sumner, WA
- Average wind speed in January:
4.9mph - Average wind speed in February:
4.7mph - Average wind speed in March:
4.8mph - Average wind speed in April:
4.3mph - Average wind speed in May:
3.9mph - Average wind speed in June:
3.8mph
- Average wind speed in July:
3.6mph - Average wind speed in August:
3.5mph - Average wind speed in September:
3.7mph - Average wind speed in October:
4.1mph - Average wind speed in November:
4.7mph - Average wind speed in December:
4.5mph
The windiest month (with the highest average wind speed) is January (4.9mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity
Sumner, WA
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are July and August (70%).
Average rainfall
Sumner, WA
- Average rainfall in January:
5.2" - Average rainfall in February:
3.62" - Average rainfall in March:
3.98" - Average rainfall in April:
2.83" - Average rainfall in May:
2.01" - Average rainfall in June:
1.54"
- Average rainfall in July:
0.51" - Average rainfall in August:
0.71" - Average rainfall in September:
1.61" - Average rainfall in October:
3.94" - Average rainfall in November:
4.41" - Average rainfall in December:
5.35"
The wettest month (with the highest rainfall) is December (5.35").
The driest month (with the least rainfall) is July (0.51").
Average rainfall days
Sumner, WA
- Average rainfall days in January:
18.6 days - Average rainfall days in February:
17.3 days - Average rainfall days in March:
20.7 days - Average rainfall days in April:
18.5 days - Average rainfall days in May:
14.8 days - Average rainfall days in June:
13.3 days
- Average rainfall days in July:
7.6 days - Average rainfall days in August:
6.8 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
16.4 days - Average rainfall days in November:
19.5 days - Average rainfall days in December:
19.3 days
The month with the highest number of rainy days is March (20.7 days).
The month with the least rainy days is August (6.8 days).
Average snowfall
Sumner, WA
The month with the highest snowfall is February (3.31").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Sumner, WA
- Average snowfall days in January:
2.8 days - Average snowfall days in February:
5.3 days - Average snowfall days in March:
2.9 days - Average snowfall days in April:
0.8 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 days - Average snowfall days in October:
0 days - Average snowfall days in November:
1.1 days - Average snowfall days in December:
2.9 days
The month with the highest number of snowfall days is February (5.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Sumner, WA
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 4min - Average daylight in May:
15h and 1min - Average daylight in June:
15h and 5min
- Average daylight in July:
15h and 3min - Average daylight in August:
14h and 1min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 2min - Average daylight in December:
8h and 4min
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).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
4h and 3min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 5min - Average sunshine in May:
9h and 0min - Average sunshine in June:
9h and 2min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 5min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 3min - Average sunshine in November:
4h and 4min - Average sunshine in December:
4h and 1min
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).
Average sunshine days
Sumner, WA
- Average sunshine days in January:
10.3 days - Average sunshine days in February:
8.2 days - Average sunshine days in March:
8.6 days - Average sunshine days in April:
9.2 days - Average sunshine days in May:
14.6 days - Average sunshine days in June:
13.8 days
- Average sunshine days in July:
21.7 days - Average sunshine days in August:
22 days - Average sunshine days in September:
16.9 days - Average sunshine days in October:
13.3 days - Average sunshine days in November:
8.8 days - Average sunshine days in December:
10.1 days
The month with the most sunshine days is August (22 days).
The month with the least sunshine days is February (8.2 days).
Average UV index
Sumner, 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).
Average cloud cover
Sumner, WA
The months with the most cloud cover are January and December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility
Sumner, WA
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February and December (4mi).
Sumner, Washington, USA
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