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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 is a chilly winter month in Heisson, Washington, with an average temperature ranging between max 44.2°F (6.8°C) and min 33.8°F (1°C). With the start of January, Heisson measures an average high-temperature of a frosty 44.2°F (6.8°C), not significantly differing from December's 42.6°F (5.9°C). Weather in January »
Weather in February
The last month of the winter, February, is another chilly month in Heisson, Washington, with temperature in the range of an average high of 45.3°F (7.4°C) and an average low of 33.8°F (1°C). February is marked by an average high-temperature of a still chilly 45.3°F (7.4°C), almost identical to the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Heisson, is a cool month, with an average temperature fluctuating between 35.8°F (2.1°C) and 50.4°F (10.2°C). At the onset of March, Heisson records an average high-temperature of a cool 50.4°F (10.2°C), showing little deviation from the preceding month. Weather in March »
Weather in April
April is a mild spring month in Heisson, Washington, with temperature in the range of an average high of 56.1°F (13.4°C) and an average low of 38.1°F (3.4°C). April sees a marginal temperature increase, moving from a fresh 50.4°F (10.2°C) in March to a mild 56.1°F (13.4°C). Weather in April »
Weather in May
The last month of the spring, May, is a comfortable month in Heisson, Washington, with an average temperature fluctuating between 42.4°F (5.8°C) and 64.9°F (18.3°C). The arrival of May signals a slight increase in the average high-temperature, moving from a moderate 56.1°F (13.4°C) in April to an enjoyable 64.9°F (18.3°C). Weather in May »
Weather in June
The first month of the summer, June, is an agreeable month in Heisson, Washington, with an average temperature ranging between min 46.4°F (8°C) and max 70.2°F (21.2°C). The onset of June notes an average high-temperature of a pleasant 70.2°F (21.2°C), subtly shifted from May's 64.9°F (18.3°C). Weather in June »
Weather in July
July is a moderately hot summer month in Heisson, Washington, with temperature in the range of an average high of 78.4°F (25.8°C) and an average low of 50.2°F (10.1°C). July's arrival coincides with a marginal rise in the average high-temperature, moving from June's pleasant 70.2°F (21.2°C) to a warm 78.4°F (25.8°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Heisson, Washington, with temperature in the range of an average low of 52°F (11.1°C) and an average high of 79.3°F (26.3°C). August temperatures tend to peak at an average high of 79.3°F (26.3°C) and dip to a low of 52°F (11.1°C). Weather in August »
Weather in September
September, the first month of the autumn in Heisson, is also an agreeable month, with an average temperature ranging between max 71.6°F (22°C) and min 49.1°F (9.5°C). The advent of September brings a subtle shift in temperature, with the average high moving from a moderately hot 79.3°F (26.3°C) in August to an agreeable 71.6°F (22°C). Weather in September »
Weather in October
October, the same as September, in Heisson, Washington, is another mild autumn month, with temperature in the range of an average low of 43.9°F (6.6°C) and an average high of 59.7°F (15.4°C). In October, the average high-temperature goes from an agreeable 71.6°F (22°C) in September to a mild 59.7°F (15.4°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Heisson, Washington, with an average temperature ranging between max 48.9°F (9.4°C) and min 38.3°F (3.5°C). Welcoming November, Heisson observes a shift in the average high-temperature, falling from October's refreshing 59.7°F (15.4°C) to a frosty 48.9°F (9.4°C). Weather in November »
Weather in December
December, the first month of the winter in Heisson, is also a wintry month, with an average temperature fluctuating between 42.6°F (5.9°C) and 32.7°F (0.4°C). Heisson witnesses the coldest weather in December, with temperatures averaging a high of 42.6°F (5.9°C) and a low of 32.7°F (0.4°C). Weather in December »
Updated: Jul 15, 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
What is the wettest month?
January is the month with the most rainfall. Rain falls for 18.8 days and accumulates 6.06" (154mm) of precipitation.
How much does it rain?
In Heisson, during the entire year, the rain falls for 177.9 days and collects up to 40.67" (1033mm) of precipitation.
When does it snow?
January through March, November and December are months with snowfall.
How much does it snow?
Throughout the year, there are 9.8 snowfall days, and 7.4" (188mm) of snow is accumulated.
What are the months with the least sunshine?
The months with the least sunshine are January and February, with an average of 3.8h of sunshine.
What is the month with the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
What is the most humid month?
The most humid month is February, with an average relative humidity of 86%.
What is the snowiest month?
The month with the most snowfall is February, when snow falls for 3.7 days and typically aggregates up to 2.76" (70mm) of snow.
When is Daylight Saving Time (DST)?
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 Heisson, Washington, snow does not fall in April through October.
When are the longest days?
With an average of 15h and 42min of daylight, June has the longest days of the year.
What is the driest month?
The month with the least rainfall is July, when the rain falls for 5.6 days and typically collects 0.35" (9mm) of precipitation.
What is the month with the highest UV index?
July is the month with the highest UV index, with an average maximum UV index of 6.
What is the warmest month in Heisson?
Heisson's warmest weather arrives in August, when temperatures average a high of 79.3°F (26.3°C) and a low of 52°F (11.1°C).
What is the least humid month?
With an average relative humidity of 67%, August is the least humid month.
What month has the most sunshine?
The month with the most sunshine is August, with an average of 10.8h of sunshine.
What time of the year is the coldest?
December is the month when Heisson experiences its coldest temperatures, averaging a high of 42.6°F (5.9°C) and a low of 32.7°F (0.4°C).
What is the month with the shortest days?
December has the shortest days of the year, with an average of 8h and 42min of daylight.
Average temperature
Heisson, WA
The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (42.6°F).
The month with the highest average low temperature is August (52°F).
The coldest month (with the lowest average low temperature) is December (32.7°F).
Average pressure
Heisson, WA
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
30.06"Hg - Average pressure in May:
30.03"Hg - Average pressure in June:
30.03"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:
30.05"Hg - Average pressure in November:
30.06"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed
Heisson, WA
- Average wind speed in January:
6.1mph - Average wind speed in February:
5.5mph - Average wind speed in March:
5.3mph - Average wind speed in April:
4.7mph - Average wind speed in May:
4.2mph - Average wind speed in June:
4mph
- Average wind speed in July:
4.1mph - Average wind speed in August:
3.8mph - Average wind speed in September:
4mph - Average wind speed in October:
4.6mph - Average wind speed in November:
5.5mph - Average wind speed in December:
5.7mph
The windiest month (with the highest average wind speed) is January (6.1mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).
Average humidity
Heisson, WA
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is August (67%).
Average rainfall
Heisson, WA
- Average rainfall in January:
6.06" - Average rainfall in February:
4.49" - Average rainfall in March:
4.41" - Average rainfall in April:
3.58" - Average rainfall in May:
2.24" - Average rainfall in June:
1.57"
- Average rainfall in July:
0.35" - Average rainfall in August:
0.47" - Average rainfall in September:
2.01" - Average rainfall in October:
4.69" - Average rainfall in November:
4.84" - Average rainfall in December:
5.94"
The wettest month (with the highest rainfall) is January (6.06").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days
Heisson, WA
- Average rainfall days in January:
18.8 days - Average rainfall days in February:
17.3 days - Average rainfall days in March:
20.3 days - Average rainfall days in April:
19 days - Average rainfall days in May:
13.9 days - Average rainfall days in June:
12.1 days
- Average rainfall days in July:
5.6 days - Average rainfall days in August:
5.1 days - Average rainfall days in September:
10.5 days - Average rainfall days in October:
16.9 days - Average rainfall days in November:
19.4 days - Average rainfall days in December:
19 days
The month with the highest number of rainy days is March (20.3 days).
The month with the least rainy days is August (5.1 days).
Average snowfall
Heisson, WA
The month with the highest snowfall is February (2.76").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Heisson, WA
- Average snowfall days in January:
1.7 days - Average snowfall days in February:
3.7 days - Average snowfall days in March:
1.9 days - Average snowfall days in April:
0.2 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:
0.8 days - Average snowfall days in December:
1.5 days
The month with the highest number of snowfall days is February (3.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Heisson, WA
- Average daylight in January:
9h and 1min - 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 0min - Average daylight in June:
15h and 4min
- Average daylight in July:
15h and 2min - 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 3min - Average daylight in December:
8h and 4min
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:
3h and 5min - Average sunshine in February:
3h and 5min - Average sunshine in March:
5h and 2min - Average sunshine in April:
7h and 1min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 0min
- Average sunshine in July:
10h and 4min - Average sunshine in August:
10h and 5min - Average sunshine in September:
9h and 0min - Average sunshine in October:
5h and 1min - Average sunshine in November:
4h and 1min - Average sunshine in December:
3h and 5min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The months with the least sunshine are January and February (Average sunshine: 3h and 48min).
Average sunshine days
Heisson, WA
- Average sunshine days in January:
10.4 days - Average sunshine days in February:
8.2 days - Average sunshine days in March:
8.5 days - Average sunshine days in April:
9.5 days - Average sunshine days in May:
15.5 days - Average sunshine days in June:
15.6 days
- Average sunshine days in July:
24.1 days - Average sunshine days in August:
23.8 days - Average sunshine days in September:
17.5 days - Average sunshine days in October:
13 days - Average sunshine days in November:
9.2 days - Average sunshine days in December:
10.1 days
The month with the most sunshine days is July (24.1 days).
The month with the least sunshine days is February (8.2 days).
Average UV index
Heisson, WA
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Heisson, WA
The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility
Heisson, WA
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (5mi).
Heisson, Washington, USA
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