Climate and monthly weather forecastSumpter, OR
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in Sumpter, Oregon, with temperature in the range of an average high of 31.8°F (-0.1°C) and an average low of 19.4°F (-7°C). The average high-temperature during January registers at a still freezing cold 31.8°F (-0.1°C), maintaining a close resemblance to the previous month. Weather in January »Weather in February
The last month of the winter, February, is an icy month in Sumpter, Oregon, with an average temperature ranging between min 22.6°F (-5.2°C) and max 34.3°F (1.3°C). The introduction of February notes a subtle temperature variation to a wintry 34.3°F (1.3°C) from January's 31.8°F (-0.1°C). Weather in February »Weather in March
The first month of the spring, March, is still a cold month in Sumpter, Oregon, with an average temperature ranging between min 27.3°F (-2.6°C) and max 41.9°F (5.5°C). March witnesses a subtle temperature ascent, adjusting from a wintry 34.3°F (1.3°C) in February to a still icy 41.9°F (5.5°C). Weather in March »Weather in April
April is a fresh spring month in Sumpter, Oregon, with an average temperature ranging between max 50.5°F (10.3°C) and min 31.1°F (-0.5°C). April brings a slight increase in the average high-temperature, progressing from a cold 41.9°F (5.5°C) in March to a cool 50.5°F (10.3°C). Weather in April »Weather in May
May, the last month of the spring in Sumpter, is an enjoyable month, with an average temperature fluctuating between 60.8°F (16°C) and 38.3°F (3.5°C). May's onset witnesses a shift in the average high-temperature, moving from a cool 50.5°F (10.3°C) in April to a refreshing 60.8°F (16°C). Weather in May »Weather in June
June, the first month of the summer in Sumpter, is a pleasant month, with an average temperature ranging between max 69.4°F (20.8°C) and min 44.4°F (6.9°C). A gentle upsurge in temperatures occurs as May gives way to June, with average highs shifting from a refreshing 60.8°F (16°C) to a pleasant 69.4°F (20.8°C). Weather in June »Weather in July
July is a warm summer month in Sumpter, Oregon, with temperature in the range of an average low of 52.3°F (11.3°C) and an average high of 81.7°F (27.6°C). July is the warmest month, with the temperature often reaching an average high of 81.7°F (27.6°C) and an average low of 52.3°F (11.3°C). For July, the heat index is appraised at 80.6°F (27°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Sumpter, Oregon, with temperature in the range of an average high of 81.3°F (27.4°C) and an average low of 53.8°F (12.1°C). August brings an average high-temperature of a still moderately hot 81.3°F (27.4°C), showing a slight difference from July's 81.7°F (27.6°C). Weather in August »Weather in September
September, the first month of the autumn in Sumpter, is still a pleasant month, with an average temperature fluctuating between 71.2°F (21.8°C) and 47.3°F (8.5°C). A moderate decline in the average high-temperature is seen during September, decreasing from a moderately hot 81.3°F (27.4°C) in August to a pleasant 71.2°F (21.8°C). Weather in September »Weather in October
October, like September, in Sumpter, Oregon, is a cool autumn month, with temperature in the range of an average high of 55.2°F (12.9°C) and an average low of 36.5°F (2.5°C). The onset of October witnesses a clear shift in the average high-temperature, dropping from an agreeable 71.2°F (21.8°C) in September to a fresh 55.2°F (12.9°C). Weather in October »Weather in November
The last month of the autumn, November, is also an icy month in Sumpter, Oregon, with an average temperature varying between 27°F (-2.8°C) and 40.5°F (4.7°C). Sumpter's weather in November is characterized by a distinct drop in the average high-temperature, reducing from a cool 55.2°F (12.9°C) in October to an icy 40.5°F (4.7°C). Weather in November »Weather in December
The first month of the winter, December, is still a freezing cold month in Sumpter, Oregon, with an average temperature fluctuating between 30.7°F (-0.7°C) and 18.5°F (-7.5°C). December stands out as Sumpter's coldest month, with temperatures ranging between an average high of 30.7°F (-0.7°C) and a low of 18.5°F (-7.5°C). Weather in December »Updated: Jul 23, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
With an average relative humidity of 88%, January is the most humid month.
Throughout the year, there are 113.5 rainfall days, and 12.56" (319mm) of precipitation is accumulated.
Months with snowfall are January through May, October through December.
In Sumpter, during the entire year, snow falls for 65.1 days and aggregates up to 38.9" (988mm) of snow.
The month with the least sunshine in Sumpter is January, with an average of 4.8h of sunshine.
January is the month with the lowest UV index, with an average maximum UV index of 1.
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.
In Sumpter, snow does not fall in June through September.
With an average of 15h and 30min of daylight, June has the longest days of the year.
In Sumpter, the peak average temperatures are observed in July, with a high of 81.7°F (27.6°C) and a low of 52.3°F (11.3°C).
July is the month with the highest UV index, with an average maximum UV index of 6.
August is the least humid month, with an average relative humidity of 40%.
August is the month with the least rainfall. Rain falls for 4.4 days and accumulates 0.31" (8mm) of precipitation.
The month with the most sunshine is August, with an average of 12.1h of sunshine.
In Sumpter, December is the month with the lowest recorded average temperatures, measuring a high of 30.7°F (-0.7°C) and a low of 18.5°F (-7.5°C).
The month with the most rainfall is December, when the rain falls for 8.6 days and typically aggregates up to 1.77" (45mm) of precipitation.
The month with the most snowfall is December, when snow falls for 14.7 days and typically aggregates up to 10.59" (269mm) of snow.
The month with the shortest days is December, with an average of 8h and 54min of daylight.
Average temperature
Sumpter, OR
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (30.7°F).
The month with the highest average low temperature is August (53.8°F).
The coldest month (with the lowest average low temperature) is December (18.5°F).
Average pressure
Sumpter, OR
- Average pressure in January:
30.22"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.04"Hg - Average pressure in April:
30.01"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.94"Hg - Average pressure in August:
29.92"Hg - Average pressure in September:
29.96"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.12"Hg - Average pressure in December:
30.19"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed
Sumpter, OR
- Average wind speed in January:
5.5mph - Average wind speed in February:
5.5mph - Average wind speed in March:
5.8mph - Average wind speed in April:
6.2mph - Average wind speed in May:
5.7mph - Average wind speed in June:
5.8mph
- Average wind speed in July:
5.7mph - Average wind speed in August:
5.5mph - Average wind speed in September:
5.4mph - Average wind speed in October:
5.4mph - Average wind speed in November:
5.7mph - Average wind speed in December:
5.8mph
The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are September and October (5.4mph).
Average humidity
Sumpter, OR
The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is August (40%).
Average rainfall
Sumpter, OR
- Average rainfall in January:
1.61" - Average rainfall in February:
1.54" - Average rainfall in March:
1.57" - Average rainfall in April:
1.02" - Average rainfall in May:
1.22" - Average rainfall in June:
0.79"
- Average rainfall in July:
0.35" - Average rainfall in August:
0.31" - Average rainfall in September:
0.43" - Average rainfall in October:
0.91" - Average rainfall in November:
1.02" - Average rainfall in December:
1.77"
The wettest month (with the highest rainfall) is December (1.77").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days
Sumpter, OR
- Average rainfall days in January:
7.9 days - Average rainfall days in February:
9 days - Average rainfall days in March:
15.6 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
13.3 days - Average rainfall days in June:
9.9 days
- Average rainfall days in July:
4.8 days - Average rainfall days in August:
4.4 days - Average rainfall days in September:
6.5 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
8.7 days - Average rainfall days in December:
8.6 days
The month with the highest number of rainy days is March (15.6 days).
The month with the least rainy days is August (4.4 days).
Average snowfall
Sumpter, OR
- Average snowfall in January:
9.76" - Average snowfall in February:
8.03" - Average snowfall in March:
4.25" - Average snowfall in April:
1.18" - Average snowfall in May:
0.24" - Average snowfall in June:
0"
The month with the highest snowfall is December (10.59").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Sumpter, OR
- Average snowfall days in January:
14.3 days - Average snowfall days in February:
13.8 days - Average snowfall days in March:
9.1 days - Average snowfall days in April:
3.5 days - Average snowfall days in May:
0.4 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:
0.2 days - Average snowfall days in October:
1.6 days - Average snowfall days in November:
7.5 days - Average snowfall days in December:
14.7 days
The month with the highest number of snowfall days is December (14.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight / Average sunshine
Sumpter, OR
- Average daylight in January:
9h and 18min - Average daylight in February:
10h and 30min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 30min - Average daylight in May:
14h and 54min - Average daylight in June:
15h and 30min
- Average daylight in July:
15h and 12min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 36min - Average daylight in December:
8h and 54min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in January:
4h and 48min - Average sunshine in February:
4h and 54min - Average sunshine in March:
7h and 18min - Average sunshine in April:
10h and 24min - Average sunshine in May:
11h and 6min - Average sunshine in June:
11h and 30min
- Average sunshine in July:
12h and 0min - Average sunshine in August:
12h and 6min - Average sunshine in September:
10h and 42min - Average sunshine in October:
7h and 30min - Average sunshine in November:
6h and 12min - Average sunshine in December:
5h and 6min
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 48min).
Average sunshine days
Sumpter, OR
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
11.3 days - Average sunshine days in March:
11.3 days - Average sunshine days in April:
12.6 days - Average sunshine days in May:
14.3 days - Average sunshine days in June:
17.3 days
- Average sunshine days in July:
22.7 days - Average sunshine days in August:
21.9 days - Average sunshine days in September:
21.4 days - Average sunshine days in October:
18.8 days - Average sunshine days in November:
15.7 days - Average sunshine days in December:
13.9 days
The month with the most sunshine days is July (22.7 days).
The months with the least sunshine days are February and March (11.3 days).
Average UV index
Sumpter, OR
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Sumpter, OR
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility
Sumpter, OR
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
