Grass Valley, CA Weather
Grass Valley, CA climate is warm during summer when temperatures tend to be in the 70's and cold during winter when temperatures tend to be in the 40's.
The warmest month of the year is July with an average maximum temperature of 86.60 degrees Fahrenheit, while the coldest month of the year is December with an average minimum temperature of 31.00 degrees Fahrenheit.
Temperature variations between night and day tend to be relatively big during summer with a difference that can reach 32 degrees Fahrenheit, and moderate during winter with an average difference of 22 degrees Fahrenheit.
The annual average precipitation at Grass Valley is 53.07 Inches. Winter months tend to be wetter than summer months. The wettest month of the year is January with an average rainfall of 9.86 Inches.