Climate and monthly weather forecastUmtanum, WA
Climate and monthly weather forecast
Weather in January
January, the same as December, is an icy winter month in Umtanum, Washington, with an average temperature varying between 22.6°F (-5.2°C) and 34.3°F (1.3°C). The advent of January brings an average high-temperature of a still cold 34.3°F (1.3°C), exhibiting minor difference from the previous month. Weather in January »Weather in February
February, the last month of the winter in Umtanum, is also a wintry month, with an average temperature fluctuating between 37.9°F (3.3°C) and 25.2°F (-3.8°C). The shift into February finds Umtanum at an average high-temperature of a still wintry 37.9°F (3.3°C), closely comparable to January's conditions. Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Umtanum, Washington, with an average temperature fluctuating between 45.1°F (7.3°C) and 30.6°F (-0.8°C). As February transitions into March, a subtle temperature shift is observed, with average highs adjusting from an icy 37.9°F (3.3°C) to a chilly 45.1°F (7.3°C). Weather in March »Weather in April
April in Umtanum, Washington, is a fresh spring month, with an average temperature varying between 36.1°F (2.3°C) and 54.5°F (12.5°C). Umtanum's April weather brings a rise in high-temperatures, moving from a frosty 45.1°F (7.3°C) in March to a cool 54.5°F (12.5°C). Weather in April »Weather in May
May, the last month of the spring in Umtanum, is a refreshing month, with temperature in the range of an average high of 64.9°F (18.3°C) and an average low of 43.3°F (6.3°C). May shows a rise in the average high-temperature, moving from April's cool 54.5°F (12.5°C) to an enjoyable 64.9°F (18.3°C). Weather in May »Weather in June
June, the first month of the summer in Umtanum, is a pleasant month, with temperature in the range of an average low of 48.6°F (9.2°C) and an average high of 72°F (22.2°C). The onset of June introduces a subtle rise in the average high-temperature, nudging from a refreshing 64.9°F (18.3°C) in May to an agreeable 72°F (22.2°C). Weather in June »Weather in July
July is a moderately hot summer month in Umtanum, Washington, with an average temperature varying between 82°F (27.8°C) and 54.9°F (12.7°C). The months of July and August are noted for their peak temperatures, with an average high-temperature of 82°F (27.8°C). In July, the heat index is evaluated at 82.4°F (28°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Umtanum, Washington, with an average temperature varying between 82°F (27.8°C) and 55.2°F (12.9°C). The warmest period is usually observed in July and August, with the average high-temperature peaking at 82°F (27.8°C). Throughout August, the heat index is evaluated at 82.4°F (28°C). Weather in August »Weather in September
September, the first month of the autumn in Umtanum, is still a pleasant month, with an average temperature ranging between min 49.1°F (9.5°C) and max 71.1°F (21.7°C). Setting in of September comes with a decrease in the average high-temperature, moving from a moderately hot 82°F (27.8°C) in August to an agreeable 71.1°F (21.7°C). Weather in September »Weather in October
October, like September, is another refreshing autumn month in Umtanum, Washington, with an average temperature varying between 39°F (3.9°C) and 56.3°F (13.5°C). A noticeable downshift in temperatures is seen as September gives way to October, with average highs moving from a pleasant 71.1°F (21.7°C) to a mild 56.3°F (13.5°C). Weather in October »Weather in November
The last month of the autumn, November, is another cold month in Umtanum, Washington, with an average temperature fluctuating between 29.5°F (-1.4°C) and 42.6°F (5.9°C). Umtanum's progression into November involves a drop in the average high-temperature, receding from a refreshing 56.3°F (13.5°C) in October to an icy 42.6°F (5.9°C). Weather in November »Weather in December
The first month of the winter, December, is also a wintry month in Umtanum, Washington, with an average temperature ranging between min 21.4°F (-5.9°C) and max 33.3°F (0.7°C). December, marked by an average high-temperature of 33.3°F (0.7°C) and a low-temperature of 21.4°F (-5.9°C), is the coldest month. 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 in Umtanum, Washington, with an average relative humidity of 87%.
Throughout the year, there are 99.9 rainfall days, and 8.66" (220mm) of precipitation is accumulated.
January through April, September through December are months with snowfall.
Throughout the year, there are 35.4 snowfall days, and 15.59" (396mm) of snow is accumulated.
The months with the least sunshine are January and December, with an average of 4.8h of sunshine.
January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Umtanum, 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.
May through August are months without snowfall.
With an average of 15h and 48min of daylight, June has the longest days of the year in Umtanum.
Umtanum sees the average highest temperatures during the months of July and August, peaking at 82°F (27.8°C).
The months with the lowest humidity in Umtanum, Washington, are July and August, with an average relative humidity of 46%.
July is the month with the least rainfall. Rain falls for 2.9 days and accumulates 0.16" (4mm) of precipitation.
July and August, with an average of 12h of sunshine, are months with the most sunshine.
July is the month with the highest UV index, with an average maximum UV index of 6.
December brings the lowest temperatures, with an average high of 33.3°F (0.7°C) and an average low of 21.4°F (-5.9°C).
December is the month with the most rainfall in Umtanum. Rain falls for 9.4 days and accumulates 1.3" (33mm) of precipitation.
The month with the most snowfall is December, when snow falls for 8.7 days and typically aggregates up to 4.65" (118mm) of snow.
The month with the shortest days in Umtanum, Washington, is December, with an average of 8h and 36min of daylight.
Average temperature
Umtanum, WA
The warmest months (with the highest average high temperature) are July and August (82°F).
The month with the lowest average high temperature is December (33.3°F).
The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (21.4°F).
Average pressure
Umtanum, WA
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.08"Hg - Average pressure in March:
30.01"Hg - Average pressure in April:
30.01"Hg - Average pressure in May:
29.97"Hg - Average pressure in June:
29.96"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.94"Hg - Average pressure in September:
29.97"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.07"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).
Average wind speed
Umtanum, WA
- Average wind speed in January:
4.5mph - Average wind speed in February:
5.1mph - Average wind speed in March:
6mph - Average wind speed in April:
7.4mph - Average wind speed in May:
7.7mph - Average wind speed in June:
8.9mph
- Average wind speed in July:
8.8mph - Average wind speed in August:
8.3mph - Average wind speed in September:
6.9mph - Average wind speed in October:
5.5mph - Average wind speed in November:
5mph - Average wind speed in December:
4.2mph
The windiest month (with the highest average wind speed) is June (8.9mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity
Umtanum, WA
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are July and August (46%).
Average rainfall
Umtanum, WA
- Average rainfall in January:
1.22" - Average rainfall in February:
0.91" - Average rainfall in March:
0.94" - Average rainfall in April:
0.55" - Average rainfall in May:
0.91" - Average rainfall in June:
0.39"
- Average rainfall in July:
0.16" - Average rainfall in August:
0.24" - Average rainfall in September:
0.47" - Average rainfall in October:
0.79" - Average rainfall in November:
0.79" - Average rainfall in December:
1.3"
The wettest month (with the highest rainfall) is December (1.3").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days
Umtanum, WA
- Average rainfall days in January:
10.3 days - Average rainfall days in February:
9.1 days - Average rainfall days in March:
12.4 days - Average rainfall days in April:
10.9 days - Average rainfall days in May:
9.6 days - Average rainfall days in June:
5.4 days
- Average rainfall days in July:
2.9 days - Average rainfall days in August:
2.8 days - Average rainfall days in September:
6.1 days - Average rainfall days in October:
10.7 days - Average rainfall days in November:
10.3 days - Average rainfall days in December:
9.4 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (2.8 days).
Average snowfall
Umtanum, WA
The month with the highest snowfall is December (4.65").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days
Umtanum, WA
- Average snowfall days in January:
8.7 days - Average snowfall days in February:
7.9 days - Average snowfall days in March:
4.8 days - Average snowfall days in April:
1.2 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:
0.3 days - Average snowfall days in October:
0.3 days - Average snowfall days in November:
3.5 days - Average snowfall days in December:
8.7 days
The months with the highest number of snowfall days are January and December (8.7 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight / Average sunshine
Umtanum, WA
- Average daylight in January:
9h and 0min - Average daylight in February:
10h and 18min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
15h and 6min - Average daylight in June:
15h and 48min
- Average daylight in July:
15h and 24min - 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 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in January:
4h and 48min - Average sunshine in February:
5h and 30min - Average sunshine in March:
7h and 42min - Average sunshine in April:
10h and 24min - Average sunshine in May:
11h and 0min - Average sunshine in June:
11h and 48min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 0min - Average sunshine in September:
10h and 42min - Average sunshine in October:
6h and 36min - Average sunshine in November:
6h and 0min - Average sunshine in December:
4h and 48min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 4h and 48min).
Average sunshine days
Umtanum, WA
- Average sunshine days in January:
15.2 days - Average sunshine days in February:
13.5 days - Average sunshine days in March:
14.4 days - Average sunshine days in April:
15.8 days - Average sunshine days in May:
19.6 days - Average sunshine days in June:
23.3 days
- Average sunshine days in July:
27.1 days - Average sunshine days in August:
26.8 days - Average sunshine days in September:
22.8 days - Average sunshine days in October:
18.2 days - Average sunshine days in November:
14.9 days - Average sunshine days in December:
15.3 days
The month with the most sunshine days is July (27.1 days).
The month with the least sunshine days is February (13.5 days).
Average UV index
Umtanum, WA
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover
Umtanum, WA
The month with the most cloud cover is January (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 11).
Average visibility
Umtanum, 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).
