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 Roanoke with an average high temperature of 86.5°, which ranks it as about average compared to other places in Virginia. In Roanoke, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Roanoke are September, May and June.

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 Roanoke with an average of 26.1°. This is warmer than most places in Virginia.

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 Roanoke, there are 23.0 days annually when the high temperature is over 90°, which is about average compared to other places in Virginia.

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 Roanoke, there are 88.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Virginia.

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 Roanoke, there are 0.2 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Virginia.

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.


July is the wettest month in Roanoke with 4.4 inches of rain, and the driest month is February with 2.8 inches. The wettest season is Autumn with 29% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 41.9 inches in Roanoke means that it is drier than most places in Virginia.

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 Roanoke with 12.9 days of rain, and October is the driest month with only 8.2 rainy days. There are 120.7 rainy days annually in Roanoke, which is rainier than most places in Virginia. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 21% 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 15.2 inches in Roanoke means that it is about average compared to other places in Virginia.

Any measurable snowfall is a rare occurance in San Francisco.

February is the snowiest month in Roanoke with 5.1 inches of snow, and 4 months of the year have significant snowfall.

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