Hallam, PA climate
Hallam has chilly winters and warm summers. A typical July afternoon reaches 85°, a January night drops to 22°, and about 24 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Hallam feels like
Winter
Spring
Summer
Fall
Hallam 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° | 3.1" | 7.0" | 10 | 5 | 20° – 38° |
| February | 42° | 23° | 2.6" | 8.8" | 9 | 8 | 21° – 41° |
| March | 51° | 31° | 3.8" | 3.0" | 10 | 3 | 35° – 51° |
| April | 63° | 40° | 3.6" | 0 | 11 | 0 | 47° – 57° |
| May | 73° | 51° | 3.9" | 0 | 13 | 0 | 57° – 67° |
| June | 81° | 60° | 4.1" | 0 | 10 | 0 | 67° – 73° |
| July | 85° | 65° | 4.5" | 0 | 11 | 0 | 70° – 79° |
| August | 83° | 63° | 3.9" | 0 | 10 | 0 | 69° – 76° |
| September | 77° | 55° | 4.6" | 0 | 8 | 0 | 63° – 70° |
| October | 65° | 44° | 4.1" | 0 | 9 | 0 | 50° – 61° |
| November | 53° | 34° | 3.2" | 0.1" | 9 | 0 | 38° – 49° |
| December | 43° | 27° | 3.5" | 4.8" | 10 | 3 | 26° – 46° |
| Year | 63° | 43° | 44.8" | 23.7" | 120 | 19 |
“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 Hallam
Hallam gets 45 inches of rain and melted snow a year. September is the wettest month and February the driest. Rain or snow falls on about 120 days a year. Snow covers the ground about 19 days of the year.
About 177 frost-free days a year
In half of years the last 32° night comes by April 26 and the first one by October 19. That leaves about 177 frost-free days for gardens, shorter than 51% of U.S. towns.
Heating and cooling a home in Hallam
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Hallam, 83% of that work is heating and 17% 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 Hallam 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 Hallam averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.2°). The shift is larger than in 88% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Hallam’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 21° to 41°. September is the most reliable, staying within 6°.
Common questions about Hallam’s climate
What is the coldest month in Hallam?
January, with a typical high of 38° and a low of 22°.
What is the hottest month in Hallam?
July, with a typical high of 85° and a low of 65°. About 28 days a year reach 90°.
How much snow does Hallam get?
About 24 inches in a normal winter, most of it in February.
When is the first frost in Hallam?
In half of years the first 32° night comes by October 19, and the last spring frost by April 26.
What is the rainiest month in Hallam?
September, with 4.6 inches of rain and melted snow. The year totals 45 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Hallam itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at York Haven, PA (10 mi, snow) and York 3 Ssw Pump Stn, PA (10 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.