2025 Compare Climate & Weather:
Alpine, CA vs Grass Valley, CA

Highlights

On average, there are 243 sunny days per year in Grass Valley. Alpine averages 262 sunny days per year. The US average is 205 sunny days.

Grass Valley, California gets 55 inches of rain, on average, per year. Alpine, California gets 16.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Grass Valley averages 11.3 inches of snow per year. Alpine averages 0.1 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Grass Valley, California
Summer High: the July high is around 87.2 degrees
Winter Low: the January low is 34.2
Rain: averages 55 inches of rain a year
Snow: averages 11.3 inches of snow a year

Alpine, California
Summer High: the July high is around 87.8 degrees
Winter Low: the January low is 40
Rain: averages 16.2 inches of rain a year
Snow: averages 0.1 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Grass Valley is 7.9 (10=best), which means it is less comfortable than most places in California.

The annual BestPlaces Comfort Index for Alpine is 8.7 (10=best), which means it is more comfortable than most places in California.

Today's Weather - Alpine, CA

88°F

Today's Weather - Grass Valley, CA

80°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Alpine / Grass Valley

August is the hottest month for Alpine with an average high temperature of 89.4°, which ranks it as about average compared to other places in California. In Alpine, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Alpine are October, May and June.

July is the hottest month for Grass Valley with an average high temperature of 87.2°, which ranks it as about average compared to other places in California. In Grass Valley, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Grass Valley are June, September and May.

December has the coldest nighttime temperatures for Alpine with an average of 39.2°. This is warmer than most places in California.

December has the coldest nighttime temperatures for Grass Valley with an average of 34.0°. This is colder than most places in California.

In Alpine, there are 48.0 days annually when the high temperature is over 90°, which is about average compared to other places in California.

In Grass Valley, there are 28.3 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Alpine, there are 17.8 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in California.

In Grass Valley, there are 45.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in California.

In Alpine, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

In Grass Valley, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

February is the wettest month in Alpine with 3.4 inches of rain, and the driest month is June with 0.1 inches. The wettest season is Spring with 53% of yearly precipitation and 2% occurs in Autumn, which is the driest season. The annual rainfall of 16.2 inches in Alpine means that it is about average compared to other places in California.


December is the wettest month in Grass Valley with 10.4 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 53% of yearly precipitation and 2% occurs in Autumn, which is the driest season. The annual rainfall of 55.0 inches in Grass Valley means that it is one of the wettest places in California.

February is the rainiest month in Alpine with 7.5 days of rain, and June is the driest month with only 0.8 rainy days. There are 44.3 rainy days annually in Alpine, which is less rainy than most places in California. The rainiest season is Spring when it rains 45% of the time and the driest is Autumn with only a 7% chance of a rainy day.

January is the rainiest month in Grass Valley with 12.7 days of rain, and July is the driest month with only 0.3 rainy days. There are 83.8 rainy days annually in Grass Valley, which is one of the rainiest places in California. The rainiest season is Spring when it rains 44% of the time and the driest is Autumn with only a 4% chance of a rainy day.

An annual snowfall of 0.1 inches in Alpine means that it is snowier than most places in California.

An annual snowfall of 11.3 inches in Grass Valley means that it is snowier than most places in California.

December is the snowiest month in Alpine with 0.0 inches of snow, and no months of the year have significant snowfall.

February is the snowiest month in Grass Valley with 3.7 inches of snow, and 6 months of the year have significant snowfall.