January weather forecastGrass Valley, CA
January
Weather in January
January, like December, in Grass Valley, California, is another fresh winter month, with an average temperature ranging between min 38.3°F (3.5°C) and max 53.8°F (12.1°C).Temperature
The start of January marks an average high-temperature of a still fresh 53.8°F (12.1°C), hardly distinguishable from the conditions in December. January witnesses an average low-temperature hovering around a cold 38.3°F (3.5°C).Humidity
The average relative humidity in January in Grass Valley, California, is 69%.Rainfall
In Grass Valley, during January, the rain falls for 10.3 days and regularly aggregates up to 5.31" (135mm) of precipitation. Throughout the year, there are 82 rainfall days, and 33.11" (841mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, November and December. In Grass Valley, in January, during 0.7 snowfall days, 1.42" (36mm) of snow is typically accumulated. In Grass Valley, during the entire year, snow falls for 6.8 days and aggregates up to 14.41" (366mm) of snow.Daylight
In Grass Valley, California, the average length of the day in January is 9h and 47min.On the first day of the month, sunrise is at 7:23 am and sunset at 4:51 pm. On the last day of January, sunrise is at 7:11 am and sunset at 5:23 pm PST.
Sunshine
January has the least sunshine of the year, with an average of 5.7h of sunshine.UV index
The average daily maximum UV index in January is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 3 in January converts into the following recommendations:
Undertake precautions - It is suggested to shield oneself from sunburn. Around midday, solar radiation is most harmful; hence, exposure should be limited. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in January
Grass Valley, CA
- Average high temperature in January: 53.8°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (51.3°F).
- Average low temperature in January: 38.3°F
The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).
Average pressure in January
Grass Valley, CA
- Average pressure in January: 30.17"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in January
Grass Valley, CA
- Average wind speed in January: 5.5mph
The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in January
Grass Valley, CA
- Average humidity in January: 69%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (37%).
Average rainfall in January
Grass Valley, CA
- Average rainfall in January: 5.31"
The wettest month (with the highest rainfall) is March (6.57").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in January
Grass Valley, CA
- Average rainfall days in January: 10.3 days
The month with the highest number of rainy days is March (15.1 days).
The month with the least rainy days is July (1.1 days).
Average snowfall in January
Grass Valley, CA
- Average snowfall in January: 1.42"
The month with the highest snowfall is February (6.42").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in January
Grass Valley, CA
- Average snowfall days in January: 0.7 days
The month with the highest number of snowfall days is March (2.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in January /
Average sunshine in January
Grass Valley, CA
- Average daylight in January: 9h and 48min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January: 5h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in January
Grass Valley, CA
- Average sunshine days in January: 19.6 days
The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (14.8 days).
Average UV index in January
Grass Valley, CA
- Average UV index in January: 3
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 2).
Average cloud cover in January
Grass Valley, CA
- Average cloud cover in January: 35
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in January
Grass Valley, CA
- Average visibility in January: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
