Climate and monthly weather forecastHappy Valley, OR
Climate and monthly weather forecast
Weather in January
January, like December, is a frosty winter month in Happy Valley, Oregon, with an average temperature ranging between max 46.2°F (7.9°C) and min 35.2°F (1.8°C). The arrival of January denotes a barely perceptible change in the average high-temperatures to a still chilly 46.2°F (7.9°C) from December's 44.4°F (6.9°C). Weather in January »Weather in February
The last month of the winter, February, is another chilly month in Happy Valley, Oregon, with an average temperature fluctuating between 47.5°F (8.6°C) and 35.6°F (2°C). Happy Valley observes an average high-temperature of a still frosty 47.5°F (8.6°C) in February, barely different from 46.2°F (7.9°C) in January. Weather in February »Weather in March
March, the first month of the spring in Happy Valley, is a cool month, with an average temperature fluctuating between 52.5°F (11.4°C) and 37.9°F (3.3°C). The commencement of March introduces an average high-temperature of a cool 52.5°F (11.4°C), closely mirroring the preceding month. Weather in March »Weather in April
April is a moderate spring month in Happy Valley, Oregon, with an average temperature fluctuating between 39.7°F (4.3°C) and 58.6°F (14.8°C). Happy Valley in April observes a minor temperature shift, with average high-temperatures adjusting from a cool 52.5°F (11.4°C) in March to a refreshing 58.6°F (14.8°C). Weather in April »Weather in May
May, the last month of the spring in Happy Valley, is a comfortable month, with an average temperature fluctuating between 66.7°F (19.3°C) and 44.1°F (6.7°C). The shift from April to May is marked by a slight increase in the average high-temperature, moving from a moderate 58.6°F (14.8°C) to a comfortable 66.7°F (19.3°C). Weather in May »Weather in June
June, the first month of the summer in Happy Valley, is an agreeable month, with temperature in the range of an average low of 48°F (8.9°C) and an average high of 72.1°F (22.3°C). Happy Valley's June weather indicates a minor ascent in high-temperatures, adjusting from an enjoyable 66.7°F (19.3°C) in May to an agreeable 72.1°F (22.3°C). Weather in June »Weather in July
July in Happy Valley, Oregon, is a moderately hot summer month, with temperature in the range of an average low of 52.3°F (11.3°C) and an average high of 80.8°F (27.1°C). July's arrival signals a subtle increase in average high-temperatures, moving from June's agreeable 72.1°F (22.3°C) to a moderately hot 80.8°F (27.1°C). Weather in July »Weather in August
The last month of the summer, August, is also a moderately hot month in Happy Valley, Oregon, with temperature in the range of an average low of 54.5°F (12.5°C) and an average high of 81.7°F (27.6°C). August brings the highest temperatures, with an average high of 81.7°F (27.6°C) and an average low of 54.5°F (12.5°C). The heat index value during August is calculated to be 84.2°F (29°C). Weather in August »Weather in September
The first month of the autumn, September, is also a moderately hot month in Happy Valley, Oregon, with temperature in the range of an average high of 74.1°F (23.4°C) and an average low of 51.1°F (10.6°C). Happy Valley's September weather features a light decline in high-temperatures, reducing from a moderately hot 81.7°F (27.6°C) in August to a still warm 74.1°F (23.4°C). Weather in September »Weather in October
October, the same as September, is another comfortable autumn month in Happy Valley, Oregon, with an average temperature varying between 61.9°F (16.6°C) and 45.5°F (7.5°C). October weather is marked by a drop in the average high-temperature, falling from a warm 74.1°F (23.4°C) in September to a comfortable 61.9°F (16.6°C). Weather in October »Weather in November
November, the last month of the autumn in Happy Valley, is also a fresh month, with an average temperature fluctuating between 51.1°F (10.6°C) and 40.1°F (4.5°C). November is characterized by a reduction in the average high-temperature, from a comfortable 61.9°F (16.6°C) in October to a fresh 51.1°F (10.6°C). Weather in November »Weather in December
December, the first month of the winter in Happy Valley, is still a chilly month, with an average temperature varying between 34.7°F (1.5°C) and 44.4°F (6.9°C). In Happy Valley, the lowest temperatures are generally noted in December, averaging a high of 44.4°F (6.9°C) and a low of 34.7°F (1.5°C). Weather in December »Updated: Jun 4, 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
Throughout the year, there are 172.2 rainfall days, and 31.3" (795mm) of precipitation is accumulated.
Months with snowfall are January through March, November and December.
Throughout the year, there are 6.5 snowfall days, and 4.13" (105mm) of snow is accumulated.
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
With an average relative humidity of 84%, February is the most humid month.
February has the least sunshine of the year, with an average of 4.2h of sunshine.
March is the month with the most snowfall. Snow falls for 1.6 days and accumulates 1.46" (37mm) of snow.
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.
April through October are months without snowfall.
With an average of 15h and 36min of daylight, June has the longest days of the year.
July is the month with the least rainfall. Rain falls for 4.8 days and accumulates 0.31" (8mm) of precipitation.
July is the month with the highest UV index, with an average maximum UV index of 6.
In Happy Valley, the peak temperatures are generally noted in August, averaging a high of 81.7°F (27.6°C) and a low of 54.5°F (12.5°C).
August is the least humid month, with an average relative humidity of 63%.
With an average of 11h of sunshine, August has the most sunshine of the year in Happy Valley.
December, with its average high-temperature of 44.4°F (6.9°C) and an average low-temperature of 34.7°F (1.5°C), holds the record as the coldest month.
The month with the most rainfall is December, when the rain falls for 18.5 days and typically aggregates up to 4.57" (116mm) of precipitation.
With an average of 8h and 48min of daylight, December has the shortest days of the year.
Average temperature
Happy Valley, OR
The warmest month (with the highest average high temperature) is August (81.7°F).
The month with the lowest average high temperature is December (44.4°F).
The month with the highest average low temperature is August (54.5°F).
The coldest month (with the lowest average low temperature) is December (34.7°F).
Average pressure
Happy Valley, OR
- 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
Happy Valley, OR
- Average wind speed in January:
6mph - Average wind speed in February:
5.7mph - Average wind speed in March:
5.4mph - Average wind speed in April:
4.8mph - Average wind speed in May:
4.2mph - Average wind speed in June:
4mph
- Average wind speed in July:
4mph - Average wind speed in August:
3.7mph - Average wind speed in September:
3.9mph - Average wind speed in October:
4.7mph - Average wind speed in November:
5.7mph - Average wind speed in December:
5.7mph
The windiest month (with the highest average wind speed) is January (6mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity
Happy Valley, OR
The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (63%).
Average rainfall
Happy Valley, OR
- Average rainfall in January:
4.25" - Average rainfall in February:
3.35" - Average rainfall in March:
3.46" - Average rainfall in April:
3.19" - Average rainfall in May:
1.77" - Average rainfall in June:
1.46"
- Average rainfall in July:
0.31" - Average rainfall in August:
0.35" - Average rainfall in September:
1.69" - Average rainfall in October:
3.35" - Average rainfall in November:
3.54" - Average rainfall in December:
4.57"
The wettest month (with the highest rainfall) is December (4.57").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days
Happy Valley, OR
- Average rainfall days in January:
17.9 days - Average rainfall days in February:
17 days - Average rainfall days in March:
20.4 days - Average rainfall days in April:
18.6 days - Average rainfall days in May:
13.9 days - Average rainfall days in June:
11.4 days
- Average rainfall days in July:
4.8 days - Average rainfall days in August:
5 days - Average rainfall days in September:
10.4 days - Average rainfall days in October:
15.5 days - Average rainfall days in November:
18.8 days - Average rainfall days in December:
18.5 days
The month with the highest number of rainy days is March (20.4 days).
The month with the least rainy days is July (4.8 days).
Average snowfall
Happy Valley, OR
The month with the highest snowfall is March (1.46").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Happy Valley, OR
- Average snowfall days in January:
1.5 days - Average snowfall days in February:
2.3 days - Average snowfall days in March:
1.6 days - Average snowfall days in April:
0.1 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:
0.2 days - Average snowfall days in December:
0.8 days
The month with the highest number of snowfall days is February (2.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Happy Valley, OR
- Average daylight in January:
9h and 12min - Average daylight in February:
10h and 24min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 36min - Average daylight in May:
14h and 54min - Average daylight in June:
15h and 36min
- Average daylight in July:
15h and 18min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 30min - Average daylight in October:
10h and 54min - Average daylight in November:
9h and 30min - Average daylight in December:
8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in January:
4h and 18min - Average sunshine in February:
4h and 12min - Average sunshine in March:
5h and 54min - Average sunshine in April:
7h and 48min - Average sunshine in May:
8h and 48min - Average sunshine in June:
9h and 24min
- Average sunshine in July:
10h and 54min - Average sunshine in August:
11h and 0min - Average sunshine in September:
9h and 18min - Average sunshine in October:
5h and 30min - Average sunshine in November:
4h and 42min - Average sunshine in December:
4h and 24min
The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days
Happy Valley, OR
- Average sunshine days in January:
11.2 days - Average sunshine days in February:
8.3 days - Average sunshine days in March:
8.7 days - Average sunshine days in April:
8.5 days - Average sunshine days in May:
14.7 days - Average sunshine days in June:
16.3 days
- Average sunshine days in July:
23.9 days - Average sunshine days in August:
23.8 days - Average sunshine days in September:
17.5 days - Average sunshine days in October:
14.1 days - Average sunshine days in November:
9.6 days - Average sunshine days in December:
10.9 days
The month with the most sunshine days is July (23.9 days).
The month with the least sunshine days is February (8.3 days).
Average UV index
Happy Valley, OR
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
Happy Valley, OR
The month with the most cloud cover is February (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility
Happy Valley, OR
The months with the highest visibility are July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April, May, June, November and December (5mi).
