Climate and monthly weather forecastCoulee Dam, WA
Climate and monthly weather forecast
Weather in January
January in Coulee Dam, Washington, is a cold winter month, with an average temperature ranging between min 21.9°F (-5.6°C) and max 32°F (0°C). In the transition from December to January, Coulee Dam reports an average high-temperature of a wintry 32°F (0°C), indicating a close resemblance to the prior month. Weather in January »Weather in February
The last month of the winter, February, is another cold month in Coulee Dam, Washington, with temperature in the range of an average high of 35.6°F (2°C) and an average low of 24.1°F (-4.4°C). At the start of February, Coulee Dam's average high-temperature reaches a still wintry 35.6°F (2°C), subtly different from the preceding month. Weather in February »Weather in March
March, the first month of the spring in Coulee Dam, is a chilly month, with temperature in the range of an average low of 32°F (0°C) and an average high of 46°F (7.8°C). The shift from February to March sees an increase in the average high-temperature, transitioning from a cold 35.6°F (2°C) to a frosty 46°F (7.8°C). Weather in March »Weather in April
April in Coulee Dam, Washington, is a refreshing spring month, with an average temperature ranging between max 57°F (13.9°C) and min 37.9°F (3.3°C). An upsurge in temperatures occurs as March gives way to April, with average highs shifting from a chilly 46°F (7.8°C) to a moderate 57°F (13.9°C). Weather in April »Weather in May
The last month of the spring, May, is a comfortable month in Coulee Dam, Washington, with an average temperature varying between 67.6°F (19.8°C) and 46°F (7.8°C). May's arrival signals an increase in average high-temperatures, moving from April's moderate 57°F (13.9°C) to a comfortable 67.6°F (19.8°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Coulee Dam, Washington, with temperature in the range of an average high of 74.3°F (23.5°C) and an average low of 51.8°F (11°C). In Coulee Dam, the onset of June comes with a modest high-temperature shift, transitioning from May's comfortable 67.6°F (19.8°C) to a moderately hot 74.3°F (23.5°C). Weather in June »Weather in July
July, like June, in Coulee Dam, Washington, is another warm summer month, with an average temperature ranging between min 59.7°F (15.4°C) and max 84.9°F (29.4°C). With an average high-temperature of 84.9°F (29.4°C) and an average low-temperature of 59.7°F (15.4°C), July is the warmest month. Weather in July »Weather in August
August, the last month of the summer in Coulee Dam, is another warm month, with an average temperature varying between 61.3°F (16.3°C) and 84.2°F (29°C). At the onset of August, Coulee Dam records an average high-temperature of a still warm 84.2°F (29°C), showing little deviation from the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Coulee Dam, is also an agreeable month, with an average temperature varying between 53.2°F (11.8°C) and 72.7°F (22.6°C). In September, the meteorological conditions alter, with the average high-temperature shifting from a warm 84.2°F (29°C) in August to an agreeable 72.7°F (22.6°C). Weather in September »Weather in October
October, the same as September, in Coulee Dam, Washington, is a moderate autumn month, with an average temperature varying between 56.3°F (13.5°C) and 41.4°F (5.2°C). October's arrival brings a noticeable temperature shift, dropping from an agreeable 72.7°F (22.6°C) in September to a refreshing 56.3°F (13.5°C). Weather in October »Weather in November
November, the last month of the autumn in Coulee Dam, is also a wintry month, with temperature in the range of an average high of 41.4°F (5.2°C) and an average low of 30.7°F (-0.7°C). As Coulee Dam welcomes November, the average high-temperature witnesses a distinct drop, moving from a moderate 56.3°F (13.5°C) in October to an icy 41.4°F (5.2°C). Weather in November »Weather in December
The first month of the winter, December, is also a subzero cold month in Coulee Dam, Washington, with an average temperature fluctuating between 21.4°F (-5.9°C) and 31.6°F (-0.2°C). Coulee Dam experiences its lowest temperatures in December, with an average peak of 31.6°F (-0.2°C) and a low of 21.4°F (-5.9°C). Weather in December »Updated: Jul 16, 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
The most humid month is January, with an average relative humidity of 89%.
Throughout the year, there are 102.1 rainfall days, and 9.65" (245mm) of precipitation is accumulated.
January through April, September through December are months with snowfall.
January is the month with the most snowfall. Snow falls for 8.4 days and accumulates 4.41" (112mm) of snow.
Throughout the year, there are 33.4 snowfall days, and 14.65" (372mm) of snow is accumulated.
With an average of 4.1h of sunshine, January has the least sunshine of the year.
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.
The wettest months are May and December, with an average 1.18" (30mm) of rainfall.
May through August are months without snowfall.
The month with the longest days is June, with an average of 16h and 0min of daylight.
July, with an average high of 84.9°F (29.4°C) and a low of 59.7°F (15.4°C), signifies the warmest month of the year.
The months with the least rainfall are July and August Rain falls for 4.2 days and accumulates 0.2" (5mm) of rain.
July is the month with the highest UV index, with an average maximum UV index of 7.
August is the least humid month, with an average relative humidity of 36%.
With an average of 12.1h of sunshine, August has the most sunshine of the year.
The month with the lowest UV index in Coulee Dam is November, with an average maximum UV index of 1.
The coldest period is December, when temperatures fluctuate between an average high of 31.6°F (-0.2°C) and a low of 21.4°F (-5.9°C).
With an average of 8h and 30min of daylight, December has the shortest days of the year.
Average temperature
Coulee Dam, WA
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is December (31.6°F).
The month with the highest average low temperature is August (61.3°F).
The coldest month (with the lowest average low temperature) is December (21.4°F).
Average pressure
Coulee Dam, WA
- Average pressure in January:
30.18"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
29.98"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.92"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:
30.03"Hg - Average pressure in November:
30.08"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
Coulee Dam, WA
- Average wind speed in January:
4.9mph - Average wind speed in February:
5.3mph - Average wind speed in March:
6.3mph - Average wind speed in April:
7mph - Average wind speed in May:
6.3mph - Average wind speed in June:
6.3mph
- Average wind speed in July:
6mph - Average wind speed in August:
5.7mph - Average wind speed in September:
5.8mph - Average wind speed in October:
5.9mph - Average wind speed in November:
5.8mph - Average wind speed in December:
5mph
The windiest month (with the highest average wind speed) is April (7mph).
The calmest month (with the lowest average wind speed) is January (4.9mph).
Average humidity
Coulee Dam, WA
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is August (36%).
Average rainfall
Coulee Dam, WA
- Average rainfall in January:
1.14" - Average rainfall in February:
0.75" - Average rainfall in March:
1.06" - Average rainfall in April:
0.79" - Average rainfall in May:
1.18" - Average rainfall in June:
0.75"
The wettest months (with the highest rainfall) are May and December (1.18").
The driest months (with the least rainfall) are July and August (0.2").
Average rainfall days
Coulee Dam, WA
- Average rainfall days in January:
9.7 days - Average rainfall days in February:
7.8 days - Average rainfall days in March:
12.1 days - Average rainfall days in April:
11.1 days - Average rainfall days in May:
10.8 days - Average rainfall days in June:
8.4 days
- Average rainfall days in July:
4.2 days - Average rainfall days in August:
3.2 days - Average rainfall days in September:
5.5 days - Average rainfall days in October:
10.3 days - Average rainfall days in November:
10.5 days - Average rainfall days in December:
8.5 days
The month with the highest number of rainy days is March (12.1 days).
The month with the least rainy days is August (3.2 days).
Average snowfall
Coulee Dam, WA
The month with the highest snowfall is January (4.41").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days
Coulee Dam, WA
- Average snowfall days in January:
8.4 days - Average snowfall days in February:
6.9 days - Average snowfall days in March:
3.2 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:
0.1 days - Average snowfall days in October:
0.2 days - Average snowfall days in November:
3.3 days - Average snowfall days in December:
10.5 days
The month with the highest number of snowfall days is December (10.5 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight / Average sunshine
Coulee Dam, WA
- Average daylight in January:
8h and 54min - Average daylight in February:
10h and 18min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 42min - Average daylight in May:
15h and 12min - Average daylight in June:
16h and 0min
- Average daylight in July:
15h and 36min - Average daylight in August:
14h and 12min - Average daylight in September:
12h and 36min - Average daylight in October:
10h and 48min - Average daylight in November:
9h and 18min - Average daylight in December:
8h and 30min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in January:
4h and 6min - Average sunshine in February:
4h and 48min - Average sunshine in March:
7h and 18min - Average sunshine in April:
10h and 6min - Average sunshine in May:
10h and 54min - Average sunshine in June:
11h and 18min
- Average sunshine in July:
11h and 54min - Average sunshine in August:
12h and 6min - Average sunshine in September:
10h and 42min - Average sunshine in October:
6h and 42min - Average sunshine in November:
5h and 30min - Average sunshine in December:
4h and 24min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
Coulee Dam, WA
- Average sunshine days in January:
16 days - Average sunshine days in February:
14.8 days - Average sunshine days in March:
14.7 days - Average sunshine days in April:
15.8 days - Average sunshine days in May:
18 days - Average sunshine days in June:
19.9 days
- Average sunshine days in July:
25.5 days - Average sunshine days in August:
25.8 days - Average sunshine days in September:
23.3 days - Average sunshine days in October:
19.2 days - Average sunshine days in November:
15.4 days - Average sunshine days in December:
16 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is March (14.7 days).
Average UV index
Coulee Dam, WA
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 1).
Average cloud cover
Coulee Dam, WA
The month with the most cloud cover is January (Cloud cover 55).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility
Coulee Dam, WA
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
