Clairton, PA climate
Clairton has chilly winters and warm summers. A typical July afternoon reaches 84°, a January night drops to 22°, and about 21 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Clairton feels like
Winter
Spring
Summer
Fall
Clairton weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 22° | 3.0" | 5.7" | 15 | 9 | 22° – 40° |
| February | 42° | 24° | 2.6" | 7.2" | 12 | 7 | 20° – 41° |
| March | 51° | 31° | 3.2" | 4.6" | 13 | 3 | 35° – 52° |
| April | 64° | 40° | 3.5" | 0.1" | 14 | 0 | 46° – 57° |
| May | 73° | 50° | 4.0" | 0 | 14 | 0 | 54° – 69° |
| June | 81° | 59° | 4.5" | 0 | 13 | 0 | 66° – 72° |
| July | 84° | 62° | 4.3" | 0 | 11 | 0 | 69° – 77° |
| August | 83° | 61° | 3.8" | 0 | 10 | 0 | 68° – 77° |
| September | 77° | 55° | 3.5" | 0 | 10 | 0 | 62° – 70° |
| October | 65° | 43° | 3.0" | 0 | 12 | 0 | 51° – 60° |
| November | 53° | 34° | 2.9" | 0.5" | 12 | 1 | 37° – 49° |
| December | 42° | 27° | 3.1" | 3.3" | 13 | 5 | 25° – 46° |
| Year | 63° | 42° | 41.2" | 21.4" | 147 | 24 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Clairton
Clairton gets 41 inches of rain and melted snow a year. June is the wettest month and February the driest. Rain or snow falls on about 147 days a year. Snow covers the ground about 24 days of the year.
About 170 frost-free days a year
In half of years the last 32° night comes by May 2 and the first one by October 20. That leaves about 170 frost-free days for gardens, shorter than 61% of U.S. towns.
Heating and cooling a home in Clairton
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Clairton, 88% of that work is heating and 12% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Clairton and its neighbors
Clairton borders 4 towns with climate data. January nights across them vary by 0.4°. West Mifflin has the coldest January nights (22°) and Glassport the hottest July afternoons (84°). Clairton’s January low is 22° and its July high 84°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Clairton compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Clairton averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.2°). The shift is smaller than in 70% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Clairton’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 20° to 41°. June is the most reliable, staying within 6°.
Common questions about Clairton’s climate
What is the coldest month in Clairton?
January, with a typical high of 38° and a low of 22°.
What is the hottest month in Clairton?
July, with a typical high of 84° and a low of 62°. About 14 days a year reach 90°.
How much snow does Clairton get?
About 21 inches in a normal winter, most of it in February.
When is the first frost in Clairton?
In half of years the first 32° night comes by October 20, and the last spring frost by May 2.
What is the rainiest month in Clairton?
June, with 4.5 inches of rain and melted snow. The year totals 41 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Clairton itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Donora 1 Sw, PA (9 mi, snow) and Mckeesport, PA (3 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.