Rocklin (CA) Weather & Climate: Best Time to Visit

In Rocklin, temperatures differ significantly between summer and winter months. Average daytime temperatures reach a very hot 36°C (97°F) in July. In December, the coolest month of the year, temperatures drop to a moderate 13°C (55°F).

At night, temperatures range from around 16°C (61°F) in July to 3°C (37°F) in December.

Check out our detailed temperature page for more information.

Temperature ranges by month

On average, Rocklin receives a reasonable amount of rainfall, with an annual precipitation of 515 mm (20 in). Rocklin can be quite wet during December, receiving approximately 109 mm (4.3 in) of precipitation over 12 rainy days.

In contrast, during the driest month (July), you will experience much drier conditions, with 0.1 mm (0 in) of precipitation spread across 0 rainy days. For more details, please visit our Rocklin Precipitation page.

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

The average number of days each month with precipitation

Rocklin can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 14.7 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 4.7 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Rocklin.

The city experiences its highest humidity in January, reaching 83%. In July, the humidity drops to its lowest level at 53%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year