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United States of AmericaUnited States of America California Grass Valley
Grass Valley
Weather averages
Climate ▸Forecast ▸December ▸January ▸
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Grass Valley (CA) Weather and Climate: A Comprehensive Guide

The temperature in Grass Valley can vary quite a bit throughout the year. Temperatures can be very warm during the warmest months, and cold during the cooler months. It is also known for its large amounts of rain/snowfall. Let’s explore the climate details in depth to provide you with a complete overview.

Average maximum day and minimum night temperature

Visitors to Grass Valley can expect significant temperature changes throughout the year. Typically, average maximum daytime temperatures range from a very warm 31°C in July to a chilly 10°C in the coolest month, December.

Nights are cooler, with lows often dropping to around 1°C during the colder months. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Grass Valley is known for its substantial rain/snowfall, with annual precipitation reaching 1267 mm. The climate in Grass Valley shows significant variation throughout the year. Expect heavy rainfall in December, with an average of 261 mm of precipitation over 14 rainy days.

In contrast, July offers drier and sunnier days, with around 0.2 mm of rainfall over 0 rainy days. For more details, please visit our Grass Valley Precipitation page.

The mean monthly precipitation over the year, including rain, hail and snow

The average number of days each month with precipitation

Forecast for Grass Valley (CA)

Mon   Dec 23
16°C | 9°C
SE 3 m/s
partly cloudy and no rain

partly cloudy and no rain

hourly forecast
Tue   Dec 24
11°C | 4°C
SW 5 m/s
29 mm
overcast and heavy rain

overcast and heavy rain

hourly forecast
Wed   Dec 25
10°C | 2°C
NE 2 m/s
broken clouds and no rain

broken clouds and no rain

hourly forecast
5-Day Forecast 10-Day Forecast

The best time of year to visit Grass Valley in the United States of America

During the months of May and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • When is summer in Grass Valley?
    The hottest season / summer takes place in June, July, August and September.
  • Which months have the greatest rainfall in Grass Valley?
    Most rainfall (rainy season) is seen in January, February, March and December.
  • Does Grass Valley have a dry season?
    Yes, the months of June, July, August and September are very dry.
  • Which is the warmest month in Grass Valley?
    July has an average maximum temperature of 31°C and is the warmest month of the year.
  • Which is the coldest month in Grass Valley?
    The coldest month is December with an average maximum temperature of 10°C.
  • Which is the wettest month in Grass Valley?
    December tops the wettest month list with 261 mm of rainfall.
  • Which is the driest month in Grass Valley?
    July is the driest month with 0 mm of precipitation.

    • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.

     

     


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