2025 Compare Climate & Weather:
Williams, AZ vs Riverton, WY

Highlights

On average, there are 231 sunny days per year in Riverton. Williams averages 266 sunny days per year. The US average is 205 sunny days.

Riverton, Wyoming gets 9.5 inches of rain, on average, per year. Williams, Arizona gets 22.2 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Riverton averages 46.4 inches of snow per year. Williams averages 74.3 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Riverton, Wyoming
Summer High: the July high is around 87.3 degrees
Winter Low: the January low is 6
Rain: averages 9.5 inches of rain a year
Snow: averages 46.4 inches of snow a year

Williams, Arizona
Summer High: the July high is around 84.6 degrees
Winter Low: the January low is 21.9
Rain: averages 22.2 inches of rain a year
Snow: averages 74.3 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Riverton is 6.9 (10=best), which means it is more comfortable than most places in Wyoming.

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

Today's Weather - Williams, AZ

58°F

Today's Weather - Riverton, WY

69°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Williams / Riverton

July is the hottest month for Williams with an average high temperature of 84.6°, which ranks it as one of the coolest places in Arizona. In Williams, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Williams are September, August and June.

July is the hottest month for Riverton with an average high temperature of 87.3°, which ranks it as warmer than most places in Wyoming. In Riverton, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Riverton are June, September and August.

December has the coldest nighttime temperatures for Williams with an average of 21.2°. This is colder than most places in Arizona.

December has the coldest nighttime temperatures for Riverton with an average of 5.8°. This is colder than most places in Wyoming.

In Williams, there are 8.4 days annually when the high temperature is over 90°, which is one of the coolest places in Arizona.

In Riverton, there are 25.1 days annually when the high temperature is over 90°, which is hotter than most places in Wyoming.

In Williams, there are 155.0 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Arizona.

In Riverton, there are 194.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Wyoming.

In Williams, there are 1.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Arizona.

In Riverton, there are 27.0 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Wyoming.

August is the wettest month in Williams with 3.3 inches of rain, and the driest month is June with 0.4 inches. The wettest season is Spring with 31% of yearly precipitation and 18% occurs in Summer, which is the driest season. The annual rainfall of 22.2 inches in Williams means that it is one of the wettest places in Arizona.


May is the wettest month in Riverton with 1.7 inches of rain, and the driest month is January with 0.3 inches. The wettest season is Summer with 38% of yearly precipitation and 10% occurs in Spring, which is the driest season. The annual rainfall of 9.5 inches in Riverton means that it is drier than most places in Wyoming.

August is the rainiest month in Williams with 12.3 days of rain, and June is the driest month with only 2.5 rainy days. There are 75.3 rainy days annually in Williams, which is one of the rainiest places in Arizona. The rainiest season is Autumn when it rains 33% of the time and the driest is Summer with only a 19% chance of a rainy day.

May is the rainiest month in Riverton with 6.4 days of rain, and December is the driest month with only 2.2 rainy days. There are 44.5 rainy days annually in Riverton, which is one of the least rainy places in Wyoming. The rainiest season is Summer when it rains 32% of the time and the driest is Spring with only a 16% chance of a rainy day.

An annual snowfall of 74.3 inches in Williams means that it is one of the snowiest places in Arizona.

An annual snowfall of 46.4 inches in Riverton means that it is about average compared to other places in Wyoming.

January is the snowiest month in Williams with 19.5 inches of snow, and 7 months of the year have significant snowfall.

March is the snowiest month in Riverton with 8.2 inches of snow, and 9 months of the year have significant snowfall.