2025 Compare Climate & Weather:
Ammon, ID vs St. George, UT

Highlights

On average, there are 255 sunny days per year in St. George. Ammon averages 203 sunny days per year. The US average is 205 sunny days.

St. George, Utah gets 10 inches of rain, on average, per year. Ammon, Idaho gets 12.5 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

St. George averages 1.5 inches of snow per year. Ammon averages 39.2 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

St. George, Utah
Summer High: the July high is around 101.2 degrees
Winter Low: the January low is 28.9
Rain: averages 10 inches of rain a year
Snow: averages 1.5 inches of snow a year

Ammon, Idaho
Summer High: the July high is around 86.2 degrees
Winter Low: the January low is 12.9
Rain: averages 12.5 inches of rain a year
Snow: averages 39.2 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for St. George is 7.5 (10=best), which means it is one of the most pleasant places in Utah.

The annual BestPlaces Comfort Index for Ammon is 6.7 (10=best), which means it is more comfortable than most places in Idaho.

Today's Weather - Ammon, ID

49°F

Today's Weather - St. George, UT

71°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Ammon / St. George

July is the hottest month for Ammon with an average high temperature of 86.2°, which ranks it as warmer than most places in Idaho. In Ammon, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Ammon are June, September and August.

July is the hottest month for St. George with an average high temperature of 101.2°, which ranks it as one of the hottest places in Utah. In St. George, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. George are October, April and May.

January has the coldest nighttime temperatures for Ammon with an average of 12.9°. This is colder than most places in Idaho.

December has the coldest nighttime temperatures for St. George with an average of 28.1°. This is one of the warmest places in Utah.

In Ammon, there are 20.2 days annually when the high temperature is over 90°, which is about average compared to other places in Idaho.

In St. George, there are 118.3 days annually when the high temperature is over 90°, which is one of the hottest places in Utah.

In Ammon, there are 172.3 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Idaho.

In St. George, there are 76.5 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Utah.

In Ammon, there are 10.7 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Idaho.

In St. George, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Utah.

May is the wettest month in Ammon with 1.8 inches of rain, and the driest month is July with 0.6 inches. The wettest season is Summer with 33% of yearly precipitation and 21% occurs in Autumn, which is the driest season. The annual rainfall of 12.5 inches in Ammon means that it is drier than most places in Idaho.


February is the wettest month in St. George with 1.5 inches of rain, and the driest month is June with 0.2 inches. The wettest season is Spring with 39% of yearly precipitation and 16% occurs in Autumn, which is the driest season. The annual rainfall of 10.0 inches in St. George means that it is drier than most places in Utah.

January is the rainiest month in Ammon with 10.5 days of rain, and July is the driest month with only 4.6 rainy days. There are 93.4 rainy days annually in Ammon, which is about average compared to other places in Idaho. The rainiest season is Spring when it rains 32% of the time and the driest is Autumn with only a 19% chance of a rainy day.

February is the rainiest month in St. George with 5.9 days of rain, and June is the driest month with only 1.4 rainy days. There are 42.6 rainy days annually in St. George, which is one of the least rainy places in Utah. The rainiest season is Spring when it rains 35% of the time and the driest is Autumn with only a 18% chance of a rainy day.

An annual snowfall of 39.2 inches in Ammon means that it is less snowy than most places in Idaho.

An annual snowfall of 1.5 inches in St. George means that it is one of the least snowy places in Utah.

December is the snowiest month in Ammon with 11.0 inches of snow, and 7 months of the year have significant snowfall.

January is the snowiest month in St. George with 0.5 inches of snow, and 1 month of the year have significant snowfall.