The remote server returned an error: (400) Bad Request.The remote server returned an error: (400) Bad Request. 2025 Compare Climate & Weather: Williamstown, MA vs Sewickley township (Westmoreland County), PA

2025 Compare Climate & Weather:
Williamstown, MA vs Sewickley township (Westmoreland County), PA

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Highlights

On average, there are 162 sunny days per year in Sewickley township (Westmoreland County). Williamstown averages 185 sunny days per year. The US average is 205 sunny days.

Sewickley township (Westmoreland County), Pennsylvania gets 40.1 inches of rain, on average, per year. Williamstown, Massachusetts gets 44.4 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Sewickley township (Westmoreland County) averages 24 inches of snow per year. Williamstown averages 63.3 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Sewickley township (Westmoreland County), Pennsylvania
Summer High: the July high is around 83.5 degrees
Winter Low: the January low is 20.6
Rain: averages 40.1 inches of rain a year
Snow: averages 24 inches of snow a year

Williamstown, Massachusetts
Summer High: the July high is around 79.5 degrees
Winter Low: the January low is 12.1
Rain: averages 44.4 inches of rain a year
Snow: averages 63.3 inches of snow a year

BestPlaces Comfort Index
Sewickley township (Westmoreland County)

The annual BestPlaces Comfort Index for Sewickley is 7.1 (10=best), which means it is more comfortable than most places in Pennsylvania.

7.1 / 10
August, June and September are the most pleasant months in Sewickley, while January and February are the least comfortable months.

Williamstown

The annual BestPlaces Comfort Index for Williamstown is 6.5 (10=best), which means it is one of the least comfortable places in Massachusetts.

6.5 / 10
August, July and June are the most pleasant months in Williamstown, while January and February are the least comfortable months.

Average Monthly High / Low (°F)
MonthWilliamstown, MASewickley township (Westmoreland County), PA
January31° / 12°37° / 21°
February34° / 15°41° / 22°
March43° / 23°50° / 29°
April57° / 34°63° / 38°
May67° / 43°72° / 48°
June75° / 52°80° / 57°
July80° / 57°84° / 61°
August78° / 55°82° / 60°
September71° / 48°75° / 52°
October59° / 37°64° / 41°
November47° / 30°53° / 33°
December36° / 20°41° / 25°
Hot, Freezing, Rainy, Snowy Days: Williamstown / Sewickley township (Westmoreland County)
MonthHot DaysFreezing DaysRainy DaysSnowy Days
January0 / 029 / 2611 / 137 / 5
February0 / 026 / 2410 / 126 / 4
March0 / 026 / 2011 / 125 / 2
April0 / 014 / 811 / 131 / 0
May0 / 03 / 112 / 130 / 0
June0 / 10 / 012 / 120 / 0
July1 / 40 / 011 / 110 / 0
August0 / 30 / 010 / 100 / 0
September0 / 11 / 010 / 100 / 0
October0 / 010 / 410 / 100 / 0
November0 / 019 / 1411 / 122 / 1
December0 / 027 / 2411 / 136 / 4
July is the hottest month for Williamstown with an average high temperature of 79.5°, which ranks it as cooler than most places in Massachusetts. In Williamstown, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Williamstown are August, July and June.

July is the hottest month for Sewickley with an average high temperature of 83.5°, which ranks it as about average compared to other places in Pennsylvania. In Sewickley, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Sewickley are June, September and August.
January has the coldest nighttime temperatures for Williamstown with an average of 12.1°. This is one of the coldest places in Massachusetts.

January has the coldest nighttime temperatures for Sewickley with an average of 20.6°. This is warmer than most places in Pennsylvania.

In Williamstown, there are 1.8 days annually when the high temperature is over 90°, which is cooler than most places in Massachusetts.

In Sewickley, there are 8.6 days annually when the high temperature is over 90°, which is about average compared to other places in Pennsylvania.

In Williamstown, there are 154.2 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Massachusetts.

In Sewickley, there are 121.2 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Pennsylvania.

In Williamstown, there are 10.7 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Massachusetts.

In Sewickley, there are 2.1 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Pennsylvania.

June is the wettest month in Williamstown with 4.7 inches of rain, and the driest month is February with 2.5 inches. The wettest season is Autumn with 30% of yearly precipitation and 19% occurs in Spring, which is the driest season. The annual rainfall of 44.4 inches in Williamstown means that it is one of the driest places in Massachusetts.


May is the wettest month in Sewickley with 4.2 inches of rain, and the driest month is February with 2.5 inches. The wettest season is Autumn with 29% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 40.1 inches in Sewickley means that it is drier than most places in Pennsylvania.

May is the rainiest month in Williamstown with 12.3 days of rain, and February is the driest month with only 9.7 rainy days. There are 129.5 rainy days annually in Williamstown, which is rainier than most places in Massachusetts. The rainiest season is Summer when it rains 26% of the time and the driest is Spring with only a 24% chance of a rainy day.

April is the rainiest month in Sewickley with 13.4 days of rain, and August is the driest month with only 9.5 rainy days. There are 142.3 rainy days annually in Sewickley, which is rainier than most places in Pennsylvania. The rainiest season is Summer when it rains 27% of the time and the driest is Autumn with only a 23% chance of a rainy day.

An annual snowfall of 63.3 inches in Williamstown means that it is one of the snowiest places in Massachusetts.

An annual snowfall of 24.0 inches in Sewickley means that it is less snowy than most places in Pennsylvania.
January is the snowiest month in Williamstown with 16.8 inches of snow, and 7 months of the year have significant snowfall.

January is the snowiest month in Sewickley with 8.2 inches of snow, and 5 months of the year have significant snowfall.

DID YOU KNOW?

Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.

Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.

Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.

Reviews for Williamstown    2 Reviews
Jill · Sherman Oaks, CA
re:
Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't  More

   |    Reply
NC For Me · Apex, NC
re:
Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but  More

   |    Reply

Start Your Review of Williamstown

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Reviews for Sewickley Township (Westmoreland County)    2 Reviews
Jill · Sherman Oaks, CA
re:
Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't  More

   |    Reply
NC For Me · Apex, NC
re:
Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but  More

   |    Reply

Start Your Review of Sewickley Township (Westmoreland County)

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