Shirleysburg, PA climate
Shirleysburg has chilly winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 21°.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Shirleysburg feels like
Winter
Spring
Summer
Fall
Shirleysburg weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 38° | 21° | 2.7" | 21° – 38° |
| February | 41° | 23° | 2.4" | 20° – 40° |
| March | 50° | 29° | 3.2" | 34° – 50° |
| April | 64° | 39° | 3.6" | 47° – 57° |
| May | 73° | 49° | 3.9" | 56° – 67° |
| June | 82° | 58° | 3.8" | 66° – 72° |
| July | 86° | 62° | 3.6" | 69° – 78° |
| August | 84° | 61° | 3.5" | 68° – 76° |
| September | 77° | 53° | 4.1" | 62° – 69° |
| October | 65° | 42° | 3.4" | 49° – 60° |
| November | 53° | 33° | 2.8" | 37° – 48° |
| December | 42° | 26° | 3.1" | 25° – 42° |
| Year | 63° | 41° | 39.9" |
“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 Shirleysburg
Shirleysburg gets 40 inches of rain and melted snow a year. September is the wettest month and February the driest.
About 191 frost-free days a year
In half of years the last 32° night comes by April 19 and the first one by October 28. That leaves about 191 frost-free days for gardens, longer than 65% of U.S. towns.
Heating and cooling a home in Shirleysburg
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Shirleysburg, 87% of that work is heating and 13% 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 Shirleysburg 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 Shirleysburg averaged 1.2° warmer than the 1900s. The biggest change is in December (+2.3°). The shift is larger than in 51% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Shirleysburg’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 40°. June is the most reliable, staying within 7°.
Common questions about Shirleysburg’s climate
What is the coldest month in Shirleysburg?
January, with a typical high of 38° and a low of 21°.
What is the hottest month in Shirleysburg?
July, with a typical high of 86° and a low of 62°. About 14 days a year reach 90°.
When is the first frost in Shirleysburg?
In half of years the first 32° night comes by October 28, and the last spring frost by April 19.
What is the rainiest month in Shirleysburg?
September, with 4.1 inches of rain and melted snow. The year totals 40 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Shirleysburg itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Raystown Lake 2, PA (12 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.