Chapman, PA climate
Chapman has chilly, snowy winters and warm summers, with plenty of rain. A typical July afternoon reaches 84°, a January night drops to 19°, and about 33 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Chapman feels like
Winter
Spring
Summer
Fall
Chapman 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 | 37° | 19° | 3.6" | 9.8" | 11 | 9 | 18° – 35° |
| February | 40° | 21° | 2.9" | 10.8" | 10 | 11 | 18° – 37° |
| March | 49° | 28° | 3.9" | 6.3" | 11 | 6 | 32° – 48° |
| April | 62° | 37° | 4.1" | 0.5" | 12 | 0 | 45° – 55° |
| May | 72° | 47° | 4.0" | 0 | 12 | 0 | 55° – 65° |
| June | 79° | 56° | 4.9" | 0 | 11 | 0 | 64° – 71° |
| July | 84° | 61° | 4.9" | 0 | 11 | 0 | 68° – 77° |
| August | 82° | 60° | 5.0" | 0 | 10 | 0 | 66° – 74° |
| September | 75° | 53° | 5.0" | 0 | 10 | 0 | 61° – 68° |
| October | 64° | 41° | 4.6" | 0.2" | 10 | 0 | 47° – 60° |
| November | 52° | 32° | 3.5" | 0.9" | 9 | 1 | 37° – 47° |
| December | 41° | 24° | 4.4" | 4.6" | 12 | 5 | 25° – 44° |
| Year | 61° | 40° | 50.8" | 33.1" | 129 | 31 |
“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 Chapman
Chapman gets 51 inches of rain and melted snow a year. August is the wettest month and February the driest. Rain or snow falls on about 129 days a year. Snow covers the ground about 31 days of the year.
About 184 frost-free days a year
In half of years the last 32° night comes by April 20 and the first one by October 24. That leaves about 184 frost-free days for gardens, longer than 57% of U.S. towns.
Heating and cooling a home in Chapman
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Chapman, 84% of that work is heating and 16% 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.
How Chapman 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 Chapman averaged 2.2° warmer than the 1900s. The biggest change is in December (+3.9°). The shift is larger than in 97% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Chapman’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. December swings the most: between 1991 and 2020 its average temperature ranged from 25° to 44°. June is the most reliable, staying within 7°.
Common questions about Chapman’s climate
What is the coldest month in Chapman?
January, with a typical high of 37° and a low of 19°.
What is the hottest month in Chapman?
July, with a typical high of 84° and a low of 61°. About 18 days a year reach 90°.
How much snow does Chapman get?
About 33 inches in a normal winter, most of it in February.
When is the first frost in Chapman?
In half of years the first 32° night comes by October 24, and the last spring frost by April 20.
What is the rainiest month in Chapman?
August, with 5.0 inches of rain and melted snow. The year totals 51 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Chapman itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Allentown Intl Airport, PA (8 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.