2025 Compare Climate & Weather:
San Tan Valley, AZ vs Littleton, CO

Highlights

On average, there are 246 sunny days per year in Littleton. San Tan Valley averages 292 sunny days per year. The US average is 205 sunny days.

Littleton, Colorado gets 18.1 inches of rain, on average, per year. San Tan Valley, Arizona gets 9.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Littleton averages 68.9 inches of snow per year. San Tan Valley averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Littleton, Colorado
Summer High: the July high is around 86.9 degrees
Winter Low: the January low is 17.8
Rain: averages 18.1 inches of rain a year
Snow: averages 68.9 inches of snow a year

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

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Littleton is 7.3 (10=best), which means it is more comfortable than most places in Colorado.

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.

Today's Weather - San Tan Valley, AZ

90°F

Today's Weather - Littleton, CO

76°F

Average Monthly High / Low (°F)

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

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.

July is the hottest month for Littleton with an average high temperature of 86.9°, which ranks it as about average compared to other places in Colorado. In Littleton, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Littleton are September, June and August.

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

December has the coldest nighttime temperatures for Littleton with an average of 16.8°. This is warmer than most places in Colorado.

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 Littleton, there are 23.4 days annually when the high temperature is over 90°, which is about average compared to other places in Colorado.

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 Littleton, there are 151.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Colorado.

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.

In Littleton, there are 6.3 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Colorado.

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.


May is the wettest month in Littleton with 2.5 inches of rain, and the driest month is January with 0.6 inches. The wettest season is Summer with 35% of yearly precipitation and 12% occurs in Spring, which is the driest season. The annual rainfall of 18.1 inches in Littleton means that it is wetter than most places in Colorado.

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.

May is the rainiest month in Littleton with 9.8 days of rain, and January is the driest month with only 4.7 rainy days. There are 84.4 rainy days annually in Littleton, which is rainier than most places in Colorado. The rainiest season is Autumn when it rains 31% of the time and the driest is Spring with only a 17% chance of a rainy day.

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

An annual snowfall of 68.9 inches in Littleton means that it is snowier than most places in Colorado.

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

March is the snowiest month in Littleton with 13.5 inches of snow, and 9 months of the year have significant snowfall.