Monthly climate in Grass Valley, California, United States

Under the Köppen–Geiger climate classification Grass Valley features a hot-summer Mediterranean climate (Csa). Temperatures typically range between 7 °C (44 °F) and 26 °C (79 °F) through the year, but rarely can drop to -7 °C (19 °F) or can rise to as high as 41 °C (106 °F). The average annual precipitation amounts to about 1509 mm (59.4 inches) and receives 78 rainy days on the 1 mm (0.04 inches) threshold annually. Grass Valley enjoys an average of 3387 hours of sunshine throughout the year, and daylight varies from 9 hours 26 minutes to 14 hours 52 minutes per day.

Monthly average temperatures in Grass Valley, California, United States §

The warmest months in Grass Valley are June, July and August, with daily mean temperatures ranging from 22 to 26 °C (72 - 79 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 7 to 8 °C (44 - 46 °F) throughout the day. On average each year, Grass Valley experiences 118 days above 25 °C (77.0 °F) and 21 days below 0 °C (32.0 °F).

Monthly average precipitation in Grass Valley, California, United States §

Grass Valley usually has the most precipitation in January, February and March, with an average of 12 rainy days and 272 mm (10.7 inches) of precipitation per month. The driest months in Grass Valley are June, July and August. On average, 5 mm (0.2 inches) of precipitation falls during these months.

Monthly sunshine hours in Grass Valley, California, United States §

The sunniest months in Grass Valley are June, July and August, when the sun shines an average of 12 hours 26 minutes a day. Least sunny months in Grass Valley: January, February and December receive an average of 5 hours 47 minutes of sunshine daily.

Solar UV radiation in Grass Valley, California, United States §

Grass Valley experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 4. For more detailed information, check out our hourly Grass Valley UV Index data.

Detailed Monthly Weather Insights for Grass Valley, California, United States

Discover in-depth weather details for every month in Grass Valley. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Grass Valley's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

• January Weather in Grass Valley
• February Weather in Grass Valley
• March Weather in Grass Valley
• April Weather in Grass Valley
• May Weather in Grass Valley
• June Weather in Grass Valley
• July Weather in Grass Valley
• August Weather in Grass Valley
• September Weather in Grass Valley
• October Weather in Grass Valley
• November Weather in Grass Valley
• December Weather in Grass Valley

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.