Climate and monthly weather forecastPomona, WA
Climate and monthly weather forecast
Weather in January
January, like December, in Pomona, Washington, is another cold winter month, with an average temperature fluctuating between 25.5°F (-3.6°C) and 36.1°F (2.3°C). Pomona records an average high-temperature of a still cold 36.1°F (2.3°C) in January, closely mirroring the climate of the previous month. Weather in January »Weather in February
The last month of the winter, February, is also an icy month in Pomona, Washington, with an average temperature ranging between min 28°F (-2.2°C) and max 40.6°F (4.8°C). The shift to February signals an average high-temperature of a still icy 40.6°F (4.8°C), subtly varied from January's 36.1°F (2.3°C). Weather in February »Weather in March
March, the first month of the spring in Pomona, is a frosty month, with an average temperature ranging between min 33.4°F (0.8°C) and max 48.6°F (9.2°C). March showcases a minor temperature ascent, adjusting from February's icy 40.6°F (4.8°C) to a frosty 48.6°F (9.2°C). Weather in March »Weather in April
April is a mild spring month in Pomona, Washington, with an average temperature ranging between min 38.7°F (3.7°C) and max 57.4°F (14.1°C). A subtle rise in the average high-temperature is observed during April, adjusting from a frosty 48.6°F (9.2°C) in March to a mild 57.4°F (14.1°C). Weather in April »Weather in May
May, the last month of the spring in Pomona, is an enjoyable month, with an average temperature ranging between min 46.2°F (7.9°C) and max 67.8°F (19.9°C). May's arrival sees a rise in the average high-temperature, jumping from April's mild 57.4°F (14.1°C) to a comfortable 67.8°F (19.9°C). Weather in May »Weather in June
June, the first month of the summer in Pomona, is a warm month, with temperature in the range of an average low of 51.3°F (10.7°C) and an average high of 74.8°F (23.8°C). As June arrives, Pomona's weather shows a minor increase in high-temperatures, edging from May's enjoyable 67.8°F (19.9°C) to a warm 74.8°F (23.8°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Pomona, Washington, with temperature in the range of an average high of 84.7°F (29.3°C) and an average low of 57.7°F (14.3°C). July's arrival brings a temperature shift, moving from a moderately hot 74.8°F (23.8°C) in June to a still warm 84.7°F (29.3°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Pomona, Washington, with temperature in the range of an average low of 58.8°F (14.9°C) and an average high of 85.1°F (29.5°C). August is the month when Pomona, Washington, sees the highest average temperatures, with a high of 85.1°F (29.5°C) and a low of 58.8°F (14.9°C). August's mean heat index is evaluated at 84.2°F (29°C). Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Pomona, Washington, with an average temperature ranging between min 51.8°F (11°C) and max 74.1°F (23.4°C). September implies a gentle temperature shift, with average high-temperatures reducing from August's moderately hot 85.1°F (29.5°C) to a still warm 74.1°F (23.4°C). Weather in September »Weather in October
October, like September, is another refreshing autumn month in Pomona, Washington, with an average temperature varying between 41.7°F (5.4°C) and 59.2°F (15.1°C). October is marked by a distinct decrease in the average high-temperature, falling from a moderately hot 74.1°F (23.4°C) in September to a mild 59.2°F (15.1°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Pomona, Washington, with an average temperature fluctuating between 32°F (0°C) and 45.5°F (7.5°C). In November, the average high-temperature decreases from a moderate 59.2°F (15.1°C) in October to a frosty 45.5°F (7.5°C). Weather in November »Weather in December
December, the first month of the winter in Pomona, is also an icy month, with temperature in the range of an average high of 36°F (2.2°C) and an average low of 23.9°F (-4.5°C). Pomona experiences its lowest average temperatures in December, reaching a peak of 36°F (2.2°C) and a minimum of 23.9°F (-4.5°C). Weather in December »Updated: Jun 9, 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
With an average relative humidity of 83%, January is the most humid month.
Throughout the year, there are 87.6 rainfall days, and 5.94" (151mm) of precipitation is accumulated.
January through April, September, November and December are months with snowfall.
Throughout the year, there are 19.9 snowfall days, and 8.62" (219mm) of snow is accumulated.
With an average of 5.5h of sunshine, January has the least sunshine of the year.
January, February, 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, 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 and October are months without snowfall.
The month with the longest days is June, with an average of 15h and 48min of daylight.
July and August, with an average relative humidity of 41%, are the least humid months in Pomona, Washington.
July is the month with the least rainfall. Rain falls for 2.3 days and accumulates 0.08" (2mm) of precipitation.
The months with the most sunshine are July and August, with an average of 12.1h of sunshine.
The month with the highest UV index is July, with an average maximum UV index of 6.
August, marked by an average high-temperature of 85.1°F (29.5°C) and a low-temperature of 58.8°F (14.9°C), is the warmest month.
Pomona witnesses the coldest weather in December, with temperatures averaging a high of 36°F (2.2°C) and a low of 23.9°F (-4.5°C).
The month with the most rainfall is December, when the rain falls for 9.2 days and typically aggregates up to 0.87" (22mm) of precipitation.
December is the month with the most snowfall. Snow falls for 5.7 days and accumulates 3.07" (78mm) of snow.
December has the shortest days of the year in Pomona, with an average of 8h and 36min of daylight.
Average temperature
Pomona, WA
The warmest month (with the highest average high temperature) is August (85.1°F).
The month with the lowest average high temperature is December (36°F).
The month with the highest average low temperature is August (58.8°F).
The coldest month (with the lowest average low temperature) is December (23.9°F).
Average pressure
Pomona, WA
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.09"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:
29.93"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 (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed
Pomona, WA
- Average wind speed in January:
4.3mph - Average wind speed in February:
4.8mph - Average wind speed in March:
5.8mph - Average wind speed in April:
6.8mph - Average wind speed in May:
6.9mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
7.1mph - Average wind speed in August:
6.8mph - Average wind speed in September:
6.1mph - Average wind speed in October:
5.2mph - Average wind speed in November:
4.9mph - Average wind speed in December:
4.2mph
The windiest month (with the highest average wind speed) is June (7.4mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity
Pomona, WA
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (41%).
Average rainfall
Pomona, WA
- Average rainfall in January:
0.83" - Average rainfall in February:
0.59" - Average rainfall in March:
0.75" - Average rainfall in April:
0.35" - Average rainfall in May:
0.67" - Average rainfall in June:
0.28"
- Average rainfall in July:
0.08" - Average rainfall in August:
0.2" - Average rainfall in September:
0.28" - Average rainfall in October:
0.55" - Average rainfall in November:
0.51" - Average rainfall in December:
0.87"
The wettest month (with the highest rainfall) is December (0.87").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days
Pomona, WA
- Average rainfall days in January:
10.5 days - Average rainfall days in February:
8 days - Average rainfall days in March:
10.8 days - Average rainfall days in April:
9 days - Average rainfall days in May:
7.5 days - Average rainfall days in June:
5 days
- Average rainfall days in July:
2.3 days - Average rainfall days in August:
2.6 days - Average rainfall days in September:
4.8 days - Average rainfall days in October:
8.6 days - Average rainfall days in November:
9.3 days - Average rainfall days in December:
9.2 days
The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is July (2.3 days).
Average snowfall
Pomona, WA
The month with the highest snowfall is December (3.07").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days
Pomona, WA
- Average snowfall days in January:
4.4 days - Average snowfall days in February:
4.5 days - Average snowfall days in March:
2.8 days - Average snowfall days in April:
0.3 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:
2.1 days - Average snowfall days in December:
5.7 days
The month with the highest number of snowfall days is December (5.7 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight / Average sunshine
Pomona, WA
- Average daylight in January:
9h and 6min - 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:
5h and 30min - Average sunshine in February:
6h and 12min - Average sunshine in March:
8h and 30min - Average sunshine in April:
11h and 0min - Average sunshine in May:
11h and 24min - Average sunshine in June:
11h and 54min
- Average sunshine in July:
12h and 6min - Average sunshine in August:
12h and 6min - Average sunshine in September:
11h and 6min - Average sunshine in October:
7h and 0min - Average sunshine in November:
6h and 42min - Average sunshine in December:
5h and 48min
The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days
Pomona, WA
- Average sunshine days in January:
16.7 days - Average sunshine days in February:
15.5 days - Average sunshine days in March:
16.5 days - Average sunshine days in April:
18.5 days - Average sunshine days in May:
20.3 days - Average sunshine days in June:
23.3 days
- Average sunshine days in July:
27.6 days - Average sunshine days in August:
26.8 days - Average sunshine days in September:
23.2 days - Average sunshine days in October:
19.9 days - Average sunshine days in November:
17.3 days - Average sunshine days in December:
17.9 days
The month with the most sunshine days is July (27.6 days).
The month with the least sunshine days is February (15.5 days).
Average UV index
Pomona, 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
Pomona, WA
The month with the most cloud cover is January (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility
Pomona, WA
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
