September is the hottest month for San Francisco with an average high temperature of 69.9°, which ranks it as one of the coolest places in California. In San Francisco, there are 0 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for San Francisco are September, October and August.

July is the hottest month for Lemont with an average high temperature of 83.9°, which ranks it as cooler than most places in Illinois. In Lemont, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Lemont are June, September and August.

January has the coldest nighttime temperatures for San Francisco with an average of 45.5°. This is one of the warmest places in California.

January has the coldest nighttime temperatures for Lemont with an average of 15.1°. This is colder than most places in Illinois.

In San Francisco, there are 1.9 days annually when the high temperature is over 90°, which is one of the coolest places in California.

In Lemont, there are 8.2 days annually when the high temperature is over 90°, which is one of the coolest places in Illinois.

In San Francisco, there are 0.3 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in California.

In Lemont, there are 135.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.

In San Francisco, 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 Lemont, there are 5.9 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.

January is the wettest month in San Francisco with 4.8 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 57% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 24.6 inches in San Francisco means that it is wetter than most places in California.


August is the wettest month in Lemont with 4.3 inches of rain, and the driest month is February with 1.8 inches. The wettest season is Autumn with 32% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 39.4 inches in Lemont means that it is about average compared to other places in Illinois.

December is the rainiest month in San Francisco with 11.7 days of rain, and July is the driest month with only 0.6 rainy days. There are 72.3 rainy days annually in San Francisco, which is rainier than most places in California. The rainiest season is Spring when it rains 48% of the time and the driest is Autumn with only a 4% chance of a rainy day.

May is the rainiest month in Lemont with 12.3 days of rain, and September is the driest month with only 8.0 rainy days. There are 120.7 rainy days annually in Lemont, which is rainier than most places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.

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

An annual snowfall of 29.9 inches in Lemont means that it is snowier than most places in Illinois.

Any measurable snowfall is a rare occurance in San Francisco.

January is the snowiest month in Lemont with 10.2 inches of snow, and 6 months of the year have significant snowfall.

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