2025 Compare Climate & Weather:
Deerfield, IL vs Lake Oswego, OR

Highlights

On average, there are 141 sunny days per year in Lake Oswego. Deerfield averages 192 sunny days per year. The US average is 205 sunny days.

Lake Oswego, Oregon gets 42 inches of rain, on average, per year. Deerfield, Illinois gets 36.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Lake Oswego averages 1.5 inches of snow per year. Deerfield averages 35.9 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Lake Oswego, Oregon
Summer High: the July high is around 81.4 degrees
Winter Low: the January low is 36.6
Rain: averages 42 inches of rain a year
Snow: averages 1.5 inches of snow a year

Deerfield, Illinois
Summer High: the July high is around 83.1 degrees
Winter Low: the January low is 16.7
Rain: averages 36.3 inches of rain a year
Snow: averages 35.9 inches of snow a year

BestPlaces Comfort Index

The annual BestPlaces Comfort Index for Lake Oswego is 7.6 (10=best), which means it is one of the most pleasant places in Oregon.

The annual BestPlaces Comfort Index for Deerfield is 6.9 (10=best), which means it is less comfortable than most places in Illinois.

Today's Weather - Deerfield, IL

48°F

Today's Weather - Lake Oswego, OR

63°F

Average Monthly High / Low (°F)

Hot, Freezing, Rainy, Snowy Days: Deerfield / Lake Oswego

July is the hottest month for Deerfield with an average high temperature of 83.1°, which ranks it as one of the coolest places in Illinois. In Deerfield, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Deerfield are June, September and August.

August is the hottest month for Lake Oswego with an average high temperature of 82.0°, which ranks it as about average compared to other places in Oregon. In Lake Oswego, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lake Oswego are September, June and July.

January has the coldest nighttime temperatures for Deerfield with an average of 16.7°. This is about average compared to other places in Illinois.

December has the coldest nighttime temperatures for Lake Oswego with an average of 35.6°. This is warmer than most places in Oregon.

In Deerfield, there are 13.8 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.

In Lake Oswego, there are 14.3 days annually when the high temperature is over 90°, which is about average compared to other places in Oregon.

In Deerfield, there are 122.8 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.

In Lake Oswego, there are 28.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Oregon.

In Deerfield, there are 6.2 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

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

August is the wettest month in Deerfield with 4.3 inches of rain, and the driest month is February with 1.6 inches. The wettest season is Autumn with 32% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 36.3 inches in Deerfield means that it is one of the driest places in Illinois.


December is the wettest month in Lake Oswego with 6.8 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 42.0 inches in Lake Oswego means that it is about average compared to other places in Oregon.

April is the rainiest month in Deerfield with 12.2 days of rain, and February is the driest month with only 8.2 rainy days. There are 125.3 rainy days annually in Deerfield, which is one of the rainiest places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Spring with only a 23% chance of a rainy day.

November is the rainiest month in Lake Oswego with 18.7 days of rain, and August is the driest month with only 3.4 rainy days. There are 147.3 rainy days annually in Lake Oswego, which is about average compared to other places in Oregon. The rainiest season is Spring when it rains 35% of the time and the driest is Autumn with only a 11% chance of a rainy day.

An annual snowfall of 35.9 inches in Deerfield means that it is one of the snowiest places in Illinois.

An annual snowfall of 1.5 inches in Lake Oswego means that it is less snowy than most places in Oregon.

January is the snowiest month in Deerfield with 11.3 inches of snow, and 6 months of the year have significant snowfall.

December is the snowiest month in Lake Oswego with 0.5 inches of snow, and 2 months of the year have significant snowfall.