2025 Compare Climate & Weather:
Roseville, CA vs San Tan Valley, AZ

Highlights

On average, there are 292 sunny days per year in San Tan Valley. Roseville averages 247 sunny days per year. The US average is 205 sunny days.

San Tan Valley, Arizona gets 9.9 inches of rain, on average, per year. Roseville, California gets 21.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

San Tan Valley averages 0 inches of snow per year. Roseville averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

San Tan Valley, Arizona
Summer High: the July high is around 105 degrees
Winter Low: the January low is 39.4
Rain: averages 9.9 inches of rain a year
Snow: averages 0 inches of snow a year

Roseville, California
Summer High: the July high is around 94 degrees
Winter Low: the January low is 39
Rain: averages 21.2 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for San Tan Valley is 7.3 (10=best), which means it is less comfortable than most places in Arizona.

The annual BestPlaces Comfort Index for Roseville is 8.2 (10=best), which means it is about average compared to other places in California.

Today's Weather - Roseville, CA

52°F

Today's Weather - San Tan Valley, AZ

59°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Roseville / San Tan Valley

July is the hottest month for Roseville with an average high temperature of 94.0°, which ranks it as warmer than most places in California. In Roseville, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Roseville are October, May and April.

July is the hottest month for San Tan Valley with an average high temperature of 105.0°, which ranks it as warmer than most places in Arizona. In San Tan Valley, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Tan Valley are March, November and April.

December has the coldest nighttime temperatures for Roseville with an average of 38.9°. This is warmer than most places in California.

December has the coldest nighttime temperatures for San Tan Valley with an average of 38.3°. This is warmer than most places in Arizona.

In Roseville, there are 77.5 days annually when the high temperature is over 90°, which is hotter than most places in California.

In San Tan Valley, there are 165.5 days annually when the high temperature is over 90°, which is hotter than most places in Arizona.

In Roseville, there are 10.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In San Tan Valley, there are 14.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Arizona.

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

February is the wettest month in Roseville with 4.0 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 55% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 21.2 inches in Roseville means that it is wetter than most places in California.


August is the wettest month in San Tan Valley with 1.5 inches of rain, and the driest month is June with 0.0 inches. The wettest season is Spring with 35% of yearly precipitation and 18% occurs in Summer, which is the driest season. The annual rainfall of 9.9 inches in San Tan Valley means that it is drier than most places in Arizona.

January is the rainiest month in Roseville with 10.6 days of rain, and July is the driest month with only 0.1 rainy days. There are 60.2 rainy days annually in Roseville, which is about average compared to other places in California. The rainiest season is Spring when it rains 50% of the time and the driest is Autumn with only a 3% chance of a rainy day.

August is the rainiest month in San Tan Valley with 4.6 days of rain, and June is the driest month with only 0.3 rainy days. There are 32.2 rainy days annually in San Tan Valley, which is less rainy than most places in Arizona. The rainiest season is Spring when it rains 34% of the time and the driest is Summer with only a 18% chance of a rainy day.

There is rarely any recorded snowfall in Roseville, ranking it as one of the least snowy places in California.

There is rarely any recorded snowfall in San Tan Valley, ranking it as one of the least snowy places in Arizona.

Any measurable snowfall is a rare occurance in Roseville.

Any measurable snowfall is a rare occurance in San Tan Valley.