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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, in Grass Valley, Oregon, is another cold winter month, with an average temperature fluctuating between 38.5°F (3.6°C) and 28°F (-2.2°C). The weather during January records an average high-temperature of a still cold 38.5°F (3.6°C), closely mirroring the preceding month. Weather in January »
Weather in February
The last month of the winter, February, is also an icy month in Grass Valley, Oregon, with an average temperature varying between 29.7°F (-1.3°C) and 41.7°F (5.4°C). Grass Valley's average high-temperature in February is a still cold 41.7°F (5.4°C), marking an insignificant difference from the 38.5°F (3.6°C) of January. Weather in February »
Weather in March
March, the first month of the spring in Grass Valley, is a frosty month, with temperature in the range of an average high of 49.1°F (9.5°C) and an average low of 33.4°F (0.8°C). March's arrival coincides with a subtle temperature rise, moving from February's wintry 41.7°F (5.4°C) to a chilly 49.1°F (9.5°C). Weather in March »
Weather in April
April in Grass Valley, Oregon, is a mild spring month, with an average temperature fluctuating between 38.5°F (3.6°C) and 57.4°F (14.1°C). A soft shift in the average high-temperature is noticeable in April, transitioning from a chilly 49.1°F (9.5°C) in March to a moderate 57.4°F (14.1°C). Weather in April »
Weather in May
The last month of the spring, May, is a refreshing month in Grass Valley, Oregon, with an average temperature fluctuating between 67.3°F (19.6°C) and 45°F (7.2°C). A shift in the average high-temperature is noticeable in May, changing from a refreshing 57.4°F (14.1°C) in April to an enjoyable 67.3°F (19.6°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Grass Valley, Oregon, with an average temperature ranging between min 50.2°F (10.1°C) and max 73.9°F (23.3°C). With the beginning of June, Grass Valley's average high-temperature sees a minor increase, transitioning from an enjoyable 67.3°F (19.6°C) in May to a moderately hot 73.9°F (23.3°C). Weather in June »
Weather in July
July, like June, in Grass Valley, Oregon, is a moderately hot summer month, with an average temperature ranging between min 56.8°F (13.8°C) and max 83.5°F (28.6°C). The warmest time of the year is July, with temperatures averaging a high of 83.5°F (28.6°C) and a low of 56.8°F (13.8°C). In July, the heat index is computed to be 84.2°F (29°C). Weather in July »
Weather in August
August, the last month of the summer in Grass Valley, is another warm month, with temperature in the range of an average high of 83.3°F (28.5°C) and an average low of 57.9°F (14.4°C). During August, Grass Valley observes a subtle ascent to a still moderately hot 83.3°F (28.5°C) from July's 83.5°F (28.6°C) in the average high-temperature. Weather in August »
Weather in September
The first month of the autumn, September, is still a pleasant month in Grass Valley, Oregon, with an average temperature ranging between min 52.7°F (11.5°C) and max 73.2°F (22.9°C). Grass Valley in September demonstrates a small temperature transition, adjusting from an average high of a moderately hot 83.3°F (28.5°C) in August to an agreeable 73.2°F (22.9°C). Weather in September »
Weather in October
October, like September, is another refreshing autumn month in Grass Valley, Oregon, with temperature in the range of an average low of 43.7°F (6.5°C) and an average high of 58.8°F (14.9°C). Grass Valley's weather changes with the onset of October, slightly falling from a pleasant 73.2°F (22.9°C) in September to a mild 58.8°F (14.9°C). Weather in October »
Weather in November
November, the last month of the autumn in Grass Valley, is also a frosty month, with temperature in the range of an average high of 46°F (7.8°C) and an average low of 34.5°F (1.4°C). Grass Valley's November weather comes with a decrease in average high-temperatures, moving from a moderate 58.8°F (14.9°C) in October to a frosty 46°F (7.8°C). Weather in November »
Weather in December
December, the first month of the winter in Grass Valley, is also an icy month, with an average temperature fluctuating between 27°F (-2.8°C) and 37.4°F (3°C). December is the coldest month, with the temperature often reaching an average high of 37.4°F (3°C) and an average low of 27°F (-2.8°C). Weather in December »
Updated: Jul 19, 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
What is the most humid month?
With an average relative humidity of 84%, January is the most humid month.
What is the rainiest month?
January is the month with the most rainfall. Rain falls for 13.3 days and accumulates 1.93" (49mm) of precipitation.
How much does it rain?
In Grass Valley, during the entire year, the rain falls for 112.2 days and collects up to 10.91" (277mm) of precipitation.
When does it snow?
Months with snowfall are January through March, November and December.
How much does it snow?
Throughout the year, there are 12.6 snowfall days, and 7.6" (193mm) of snow is accumulated.
What is the month with the least sunshine in Grass Valley?
January has the least sunshine of the year, with an average of 5h of sunshine.
When is the lowest UV index?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 3.9 days and accumulates 2.87" (73mm) of snow.
When is Daylight Saving Time (DST)?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Grass Valley, 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.
When it does not snow?
April through October are months without snowfall in Grass Valley.
When are the longest days?
The month with the longest days is June, with an average of 15h and 36min of daylight.
What is the hottest time of year?
In Grass Valley, July is known for its average highest temperatures, reaching a high of 83.5°F (28.6°C) and a low of 56.8°F (13.8°C).
What is the driest month?
July is the month with the least rainfall. Rain falls for 2.9 days and accumulates 0.12" (3mm) of precipitation.
What are the months with the most sunshine?
The months with the most sunshine are July and August, with an average of 12h of sunshine.
When is the highest UV index?
The month with the highest UV index is July, with an average maximum UV index of 6.
What is the least humid month?
With an average relative humidity of 46%, August is the least humid month.
What are the coldest months?
December is the coldest month, exhibiting average temperatures of 37.4°F (3°C) at the peak and 27°F (-2.8°C) at the base.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 8h and 48min of daylight.
Average temperature
Grass Valley, OR
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (37.4°F).
The month with the highest average low temperature is August (57.9°F).
The coldest month (with the lowest average low temperature) is December (27°F).
Average pressure
Grass Valley, OR
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.09"Hg - Average pressure in March:
30.03"Hg - Average pressure in April:
30.03"Hg - Average pressure in May:
29.98"Hg - Average pressure in June:
29.97"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.95"Hg - Average pressure in September:
29.98"Hg - Average pressure in October:
30.05"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.95"Hg).
Average wind speed
Grass Valley, OR
- Average wind speed in January:
5mph - Average wind speed in February:
5.7mph - Average wind speed in March:
6.1mph - Average wind speed in April:
7.1mph - Average wind speed in May:
7.1mph - Average wind speed in June:
7.9mph
- Average wind speed in July:
7.4mph - Average wind speed in August:
6.7mph - Average wind speed in September:
6mph - Average wind speed in October:
5.4mph - Average wind speed in November:
5.5mph - Average wind speed in December:
5mph
The windiest month (with the highest average wind speed) is June (7.9mph).
The calmest months (with the lowest average wind speed) are January and December (5mph).
Average humidity
Grass Valley, OR
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is August (46%).
Average rainfall
Grass Valley, OR
- Average rainfall in January:
1.93" - Average rainfall in February:
1.34" - Average rainfall in March:
1.26" - Average rainfall in April:
0.75" - Average rainfall in May:
0.79" - Average rainfall in June:
0.39"
- Average rainfall in July:
0.12" - Average rainfall in August:
0.28" - Average rainfall in September:
0.35" - Average rainfall in October:
0.94" - Average rainfall in November:
1.02" - Average rainfall in December:
1.73"
The wettest month (with the highest rainfall) is January (1.93").
The driest month (with the least rainfall) is July (0.12").
Average rainfall days
Grass Valley, OR
- Average rainfall days in January:
13.3 days - Average rainfall days in February:
12.5 days - Average rainfall days in March:
14.3 days - Average rainfall days in April:
11.4 days - Average rainfall days in May:
8.1 days - Average rainfall days in June:
5.5 days
- Average rainfall days in July:
2.9 days - Average rainfall days in August:
3.1 days - Average rainfall days in September:
5.8 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
12.2 days - Average rainfall days in December:
12.6 days
The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is July (2.9 days).
Average snowfall
Grass Valley, OR
The month with the highest snowfall is February (2.87").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Grass Valley, OR
- Average snowfall days in January:
3.1 days - Average snowfall days in February:
3.9 days - Average snowfall days in March:
1.2 days - Average snowfall days in April:
0 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:
0.5 days - Average snowfall days in December:
3.9 days
The months with the highest number of snowfall days are February and December (3.9 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Grass Valley, OR
- Average daylight in January:
9h and 1min - Average daylight in February:
10h and 2min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 4min - Average daylight in May:
14h and 5min - Average daylight in June:
15h and 4min
- Average daylight in July:
15h and 1min - Average daylight in August:
14h and 0min - Average daylight in September:
12h and 3min - Average daylight in October:
10h and 5min - Average daylight in November:
9h and 3min - Average daylight in December:
8h and 5min
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:
5h - Average sunshine in February:
5h and 2min - Average sunshine in March:
7h and 4min - Average sunshine in April:
10h and 1min - Average sunshine in May:
11h and 1min - Average sunshine in June:
11h and 4min
- Average sunshine in July:
12h - Average sunshine in August:
12h - Average sunshine in September:
10h and 5min - Average sunshine in October:
6h and 3min - Average sunshine in November:
6h and 1min - Average sunshine in December:
5h and 1min
The months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is January (Average sunshine: 5h).
Average sunshine days
Grass Valley, OR
- Average sunshine days in January:
13.6 days - Average sunshine days in February:
12.3 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
16.1 days - Average sunshine days in May:
20.4 days - Average sunshine days in June:
22.8 days
- Average sunshine days in July:
27 days - Average sunshine days in August:
25.8 days - Average sunshine days in September:
22.3 days - Average sunshine days in October:
18.5 days - Average sunshine days in November:
14.6 days - Average sunshine days in December:
13.8 days
The month with the most sunshine days is July (27 days).
The month with the least sunshine days is February (12.3 days).
Average UV index
Grass 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
Grass Valley, OR
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility
Grass Valley, OR
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, February and December (5mi).
Grass Valley, Oregon, USA
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