Dennison, PA climate
Dennison has chilly, snowy winters and pleasant summers. A typical July afternoon reaches 80°, a January night drops to 17°, and about 48 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Dennison feels like
Winter
Spring
Summer
Fall
Dennison 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 | 33° | 17° | 3.2" | 12.3" | 13 | 18 | 15° – 33° |
| February | 36° | 18° | 2.4" | 12.7" | 11 | 16 | 15° – 34° |
| March | 44° | 25° | 3.3" | 9.2" | 11 | 10 | 27° – 46° |
| April | 58° | 35° | 3.8" | 2.1" | 12 | 1 | 41° – 51° |
| May | 68° | 46° | 3.8" | 0 | 14 | 0 | 52° – 63° |
| June | 76° | 55° | 4.4" | 0 | 13 | 0 | 62° – 69° |
| July | 80° | 59° | 4.2" | 0 | 11 | 0 | 65° – 73° |
| August | 78° | 57° | 4.3" | 0 | 11 | 0 | 64° – 71° |
| September | 71° | 50° | 4.6" | 0 | 10 | 0 | 58° – 65° |
| October | 60° | 39° | 4.3" | 0.5" | 12 | 0 | 45° – 57° |
| November | 48° | 31° | 3.3" | 2.2" | 10 | 2 | 33° – 44° |
| December | 37° | 23° | 3.4" | 9.0" | 12 | 11 | 21° – 42° |
| Year | 57° | 38° | 45.0" | 48.0" | 140 | 59 |
“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 Dennison
Dennison 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 140 days a year. Snow covers the ground about 59 days of the year.
About 153 frost-free days a year
In half of years the last 32° night comes by May 7 and the first one by October 6. That leaves about 153 frost-free days for gardens, shorter than 78% of U.S. towns.
Heating and cooling a home in Dennison
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Dennison, 95% of that work is heating and 5% 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.
Dennison and its neighbors
Dennison borders 8 towns with climate data. January nights across them vary by 2.4°. Bear Creek has the coldest January nights (15°) and Butler the hottest July afternoons (82°). Dennison’s January low is 17° and its July high 80°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Dennison 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 Dennison averaged 1.6° warmer than the 1900s. The biggest change is in December (+3.4°). The shift is larger than in 77% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Dennison’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 21° to 42°. September is the most reliable, staying within 7°.
Common questions about Dennison’s climate
What is the coldest month in Dennison?
January, with a typical high of 33° and a low of 17°.
What is the hottest month in Dennison?
July, with a typical high of 80° and a low of 59°. About 4 days a year reach 90°.
How much snow does Dennison get?
About 48 inches in a normal winter, most of it in February.
When is the first frost in Dennison?
In half of years the first 32° night comes by October 6, and the last spring frost by May 7.
What is the rainiest month in Dennison?
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 Dennison itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Mahanoy City 2 N, PA (24 mi, snow) and Francis E Walter Dam, PA (6 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.