2025 Compare Climate & Weather:
Littleton, CO vs Calais, VT

Highlights

On average, there are 159 sunny days per year in Calais. Littleton averages 246 sunny days per year. The US average is 205 sunny days.

Calais, Vermont gets 41.1 inches of rain, on average, per year. Littleton, Colorado gets 18.1 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Calais averages 105.1 inches of snow per year. Littleton averages 68.9 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Calais, Vermont
Summer High: the July high is around 78.6 degrees
Winter Low: the January low is 6
Rain: averages 41.1 inches of rain a year
Snow: averages 105.1 inches of snow a year

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

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Calais is 5.9 (10=best), which means it is less comfortable than most places in Vermont.

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

Today's Weather - Littleton, CO

71°F

Today's Weather - Calais, VT

71°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Littleton / Calais

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.

July is the hottest month for Calais with an average high temperature of 78.6°, which ranks it as cooler than most places in Vermont. In Calais, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Calais are July, August and June.

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

January has the coldest nighttime temperatures for Calais with an average of 6.0°. This is about average compared to other places in Vermont.

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 Calais, there are 3.8 days annually when the high temperature is over 90°, which is about average compared to other places in Vermont.

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 Calais, there are 169.6 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Vermont.

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

In Calais, there are 24.6 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Vermont.

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 wettest month in Calais with 4.3 inches of rain, and the driest month is February with 2.4 inches. The wettest season is Autumn with 31% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 41.1 inches in Calais means that it is drier than most places in Vermont.

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.

December is the rainiest month in Calais with 14.3 days of rain, and February is the driest month with only 10.9 rainy days. There are 151.4 rainy days annually in Calais, which is rainier than most places in Vermont. The rainiest season is Spring when it rains 25% of the time and the driest is Autumn with only a 25% chance of a rainy day.

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

An annual snowfall of 105.1 inches in Calais means that it is one of the snowiest places in Vermont.

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

January is the snowiest month in Calais with 24.2 inches of snow, and 7 months of the year have significant snowfall.