2025 Compare Climate & Weather:
Littleton, CO vs Lower Merion, PA

Highlights

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

Lower Merion, Pennsylvania gets 48.4 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.

Lower Merion averages 17.8 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

Lower Merion, Pennsylvania
Summer High: the July high is around 87.1 degrees
Winter Low: the January low is 24.2
Rain: averages 48.4 inches of rain a year
Snow: averages 17.8 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 Lower Merion is 7.3 (10=best), which means it is one of the most pleasant places in Pennsylvania.

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

66°F

Today's Weather - Lower Merion, PA

64°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Littleton / Lower Merion

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 Lower Merion with an average high temperature of 87.1°, which ranks it as one of the hottest places in Pennsylvania. In Lower Merion, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lower Merion are September, May 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 Lower Merion with an average of 24.2°. This is one of the warmest places in Pennsylvania.

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 Lower Merion, there are 25.3 days annually when the high temperature is over 90°, which is one of the hottest places in Pennsylvania.

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 Lower Merion, there are 91.1 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Pennsylvania.

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 Lower Merion, there are 0.9 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Pennsylvania.

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.


July is the wettest month in Lower Merion with 4.6 inches of rain, and the driest month is February with 3.0 inches. The wettest season is Autumn with 27% of yearly precipitation and 22% occurs in Spring, which is the driest season. The annual rainfall of 48.4 inches in Lower Merion means that it is one of the wettest places in Pennsylvania.

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.

April is the rainiest month in Lower Merion with 11.5 days of rain, and September is the driest month with only 8.1 rainy days. There are 113.6 rainy days annually in Lower Merion, which is one of the least rainy places in Pennsylvania. The rainiest season is Summer when it rains 29% of the time and the driest is Winter with only a 22% 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 17.8 inches in Lower Merion means that it is one of the least snowy places in Pennsylvania.

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

February is the snowiest month in Lower Merion with 6.9 inches of snow, and 5 months of the year have significant snowfall.