2025 Compare Climate & Weather:
Caldwell, ID vs Hillsboro, OR

Highlights

On average, there are 142 sunny days per year in Hillsboro. Caldwell averages 211 sunny days per year. The US average is 205 sunny days.

Hillsboro, Oregon gets 39.2 inches of rain, on average, per year. Caldwell, Idaho gets 10.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Hillsboro averages 3.2 inches of snow per year. Caldwell averages 8 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Hillsboro, Oregon
Summer High: the July high is around 80.8 degrees
Winter Low: the January low is 36.7
Rain: averages 39.2 inches of rain a year
Snow: averages 3.2 inches of snow a year

Caldwell, Idaho
Summer High: the July high is around 91.7 degrees
Winter Low: the January low is 23.3
Rain: averages 10.7 inches of rain a year
Snow: averages 8 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Hillsboro is 7.5 (10=best), which means it is more comfortable than most places in Oregon.

The annual BestPlaces Comfort Index for Caldwell is 7.3 (10=best), which means it is one of the most pleasant places in Idaho.

Today's Weather - Caldwell, ID

53°F

Today's Weather - Hillsboro, OR

56°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Caldwell / Hillsboro

July is the hottest month for Caldwell with an average high temperature of 91.7°, which ranks it as one of the hottest places in Idaho. In Caldwell, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Caldwell are September, May and June.

August is the hottest month for Hillsboro with an average high temperature of 81.8°, which ranks it as cooler than most places in Oregon. In Hillsboro, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Hillsboro are September, July and August.

December has the coldest nighttime temperatures for Caldwell with an average of 22.6°. This is warmer than most places in Idaho.

December has the coldest nighttime temperatures for Hillsboro with an average of 35.7°. This is warmer than most places in Oregon.

In Caldwell, there are 50.8 days annually when the high temperature is over 90°, which is one of the hottest places in Idaho.

In Hillsboro, there are 13.1 days annually when the high temperature is over 90°, which is cooler than most places in Oregon.

In Caldwell, there are 116.0 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Idaho.

In Hillsboro, there are 31.8 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Oregon.

In Caldwell, there are 2.6 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Idaho.

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

December is the wettest month in Caldwell with 1.5 inches of rain, and the driest month is July with 0.3 inches. The wettest season is Spring with 33% of yearly precipitation and 12% occurs in Autumn, which is the driest season. The annual rainfall of 10.7 inches in Caldwell means that it is drier than most places in Idaho.


December is the wettest month in Hillsboro with 6.3 inches of rain, and the driest month is July with 0.7 inches. The wettest season is Spring with 42% of yearly precipitation and 7% occurs in Autumn, which is the driest season. The annual rainfall of 39.2 inches in Hillsboro means that it is about average compared to other places in Oregon.

December is the rainiest month in Caldwell with 10.3 days of rain, and July is the driest month with only 2.3 rainy days. There are 80.0 rainy days annually in Caldwell, which is less rainy than most places in Idaho. The rainiest season is Spring when it rains 34% of the time and the driest is Autumn with only a 12% chance of a rainy day.

November is the rainiest month in Hillsboro with 20.2 days of rain, and August is the driest month with only 3.4 rainy days. There are 156.2 rainy days annually in Hillsboro, which is rainier than most places in Oregon. The rainiest season is Spring when it rains 35% of the time and the driest is Autumn with only a 10% chance of a rainy day.

An annual snowfall of 8.0 inches in Caldwell means that it is one of the least snowy places in Idaho.

An annual snowfall of 3.2 inches in Hillsboro means that it is about average compared to other places in Oregon.

December is the snowiest month in Caldwell with 3.8 inches of snow, and 4 months of the year have significant snowfall.

December is the snowiest month in Hillsboro with 1.4 inches of snow, and 3 months of the year have significant snowfall.