Monthly weather forecast and climate
Grass Valley, CA

What is the warmest month in Grass Valley?

The warmest month is July, with an average high-temperature of 87.4°F (30.8°C) and an average low-temperature of 56.1°F (13.4°C).

What is the coldest month in Grass Valley?

December is the coldest month in Grass Valley, California, with an average high-temperature of 53.1°F (11.7°C) and an average low-temperature of 31.6°F (-0.2°C).
Average temperature - Grass Valley, CA
Average rainfall - Grass Valley, CA

The wettest month (with the highest rainfall) is January (246.1mm).
The driest month (with the lowest rainfall) is July (3mm).

Average rainfall days - Grass Valley, CA

The month with the highest number of rainy days is January (13.1 days).
The month with the lowest number of rainy days is July (0.2 days).

Average snowfall - Grass Valley, CA

The month with the highest snowfall is February (63.5mm).
Months with the lowest snowfall are May, June, July, August, September and October (0mm).

Average snowfall days - Grass Valley, CA

The month with the highest number of snowfall days is March (1.1 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight - Grass Valley, CA

The month with the longest days is June (Average daylight: 14.9h).
The month with shortest days is December (Average daylight: 9.5h).

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