2025 Compare Climate & Weather:
Fullerton, CA vs Key West, FL

Highlights

On average, there are 260 sunny days per year in Key West. Fullerton averages 283 sunny days per year. The US average is 205 sunny days.

Key West, Florida gets 43.8 inches of rain, on average, per year. Fullerton, California gets 13.9 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Key West averages 0 inches of snow per year. Fullerton averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Key West, Florida
Summer High: the July high is around 89.4 degrees
Winter Low: the January low is 63.6
Rain: averages 43.8 inches of rain a year
Snow: averages 0 inches of snow a year

Fullerton, California
Summer High: the July high is around 84.6 degrees
Winter Low: the January low is 46.2
Rain: averages 13.9 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Key West is 6.1 (10=best), which means it is one of the least comfortable places in Florida.

The annual BestPlaces Comfort Index for Fullerton is 9.3 (10=best), which means it is one of the most pleasant places in California.

Today's Weather - Fullerton, CA

66°F

Today's Weather - Key West, FL

79°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Fullerton / Key West

August is the hottest month for Fullerton with an average high temperature of 86.7°, which ranks it as cooler than most places in California. In Fullerton, there are 7 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Fullerton are May, June and October.

August is the hottest month for Key West with an average high temperature of 89.6°, which ranks it as one of the coolest places in Florida. In Key West, there are 7 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Key West are March, February and December.

December has the coldest nighttime temperatures for Fullerton with an average of 45.7°. This is one of the warmest places in California.

January has the coldest nighttime temperatures for Key West with an average of 63.6°. This is one of the warmest places in Florida.

In Fullerton, there are 32.4 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Key West, there are 37.7 days annually when the high temperature is over 90°, which is one of the coolest places in Florida.

In Fullerton, there are 0.2 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in California.

In Key West, there are 0.0 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Florida.

In Fullerton, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in California.

In Key West, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Florida.

February is the wettest month in Fullerton with 3.2 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 61% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 13.9 inches in Fullerton means that it is drier than most places in California.


September is the wettest month in Key West with 7.5 inches of rain, and the driest month is February with 1.8 inches. The wettest season is Autumn with 35% of yearly precipitation and 14% occurs in Spring, which is the driest season. The annual rainfall of 43.8 inches in Key West means that it is one of the driest places in Florida.

January is the rainiest month in Fullerton with 6.3 days of rain, and August is the driest month with only 0.2 rainy days. There are 32.3 rainy days annually in Fullerton, which is less rainy than most places in California. The rainiest season is Spring when it rains 54% of the time and the driest is Autumn with only a 3% chance of a rainy day.

September is the rainiest month in Key West with 15.3 days of rain, and April is the driest month with only 4.4 rainy days. There are 102.0 rainy days annually in Key West, which is one of the least rainy places in Florida. The rainiest season is Autumn when it rains 35% of the time and the driest is Summer with only a 16% chance of a rainy day.

There is rarely any recorded snowfall in Fullerton, ranking it as one of the least snowy places in California.

There is rarely any recorded snowfall in Key West, ranking it as one of the least snowy places in Florida.

Any measurable snowfall is a rare occurance in Fullerton.

Any measurable snowfall is a rare occurance in Key West.