2025 Compare Climate & Weather:
Tucson, AZ vs Potomac, MD

Highlights

On average, there are 201 sunny days per year in Potomac. Tucson averages 286 sunny days per year. The US average is 205 sunny days.

Potomac, Maryland gets 42 inches of rain, on average, per year. Tucson, Arizona gets 12.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Potomac averages 16.8 inches of snow per year. Tucson averages 0.4 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Potomac, Maryland
Summer High: the July high is around 85.7 degrees
Winter Low: the January low is 25.3
Rain: averages 42 inches of rain a year
Snow: averages 16.8 inches of snow a year

Tucson, Arizona
Summer High: the July high is around 100.2 degrees
Winter Low: the January low is 38.7
Rain: averages 12.3 inches of rain a year
Snow: averages 0.4 inches of snow a year

BestPlaces Comfort Index

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

The annual BestPlaces Comfort Index for Tucson is 7.5 (10=best), which means it is about average compared to other places in Arizona.

Today's Weather - Tucson, AZ

69°F

Today's Weather - Potomac, MD

65°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Tucson / Potomac

June is the hottest month for Tucson with an average high temperature of 100.5°, which ranks it as warmer than most places in Arizona. In Tucson, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Tucson are March, November and April.

July is the hottest month for Potomac with an average high temperature of 85.7°, which ranks it as cooler than most places in Maryland. In Potomac, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Potomac are September, June and May.

December has the coldest nighttime temperatures for Tucson with an average of 38.0°. This is warmer than most places in Arizona.

January has the coldest nighttime temperatures for Potomac with an average of 25.3°. This is about average compared to other places in Maryland.

In Tucson, there are 149.2 days annually when the high temperature is over 90°, which is hotter than most places in Arizona.

In Potomac, there are 18.6 days annually when the high temperature is over 90°, which is cooler than most places in Maryland.

In Tucson, there are 17.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Arizona.

In Potomac, there are 87.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Maryland.

In Tucson, 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 Potomac, there are 0.2 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Maryland.

August is the wettest month in Tucson with 2.4 inches of rain, and the driest month is May with 0.2 inches. The wettest season is Autumn with 40% of yearly precipitation and 11% occurs in Summer, which is the driest season. The annual rainfall of 12.3 inches in Tucson means that it is about average compared to other places in Arizona.


May is the wettest month in Potomac with 4.3 inches of rain, and the driest month is February with 2.7 inches. The wettest season is Summer with 27% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 42.0 inches in Potomac means that it is drier than most places in Maryland.

August is the rainiest month in Tucson with 9.5 days of rain, and June is the driest month with only 1.4 rainy days. There are 51.5 rainy days annually in Tucson, which is about average compared to other places in Arizona. The rainiest season is Autumn when it rains 38% of the time and the driest is Summer with only a 15% chance of a rainy day.

May is the rainiest month in Potomac with 11.9 days of rain, and February is the driest month with only 8.4 rainy days. There are 114.0 rainy days annually in Potomac, which is about average compared to other places in Maryland. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.

An annual snowfall of 0.4 inches in Tucson means that it is about average compared to other places in Arizona.

An annual snowfall of 16.8 inches in Potomac means that it is snowier than most places in Maryland.

January is the snowiest month in Tucson with 0.2 inches of snow, and no months of the year have significant snowfall.

January is the snowiest month in Potomac with 6.4 inches of snow, and 5 months of the year have significant snowfall.