Addison, PA climate
Addison has chilly, snowy winters and pleasant summers, with plenty of rain. A typical July afternoon reaches 79°, a January night drops to 18°, and about 61 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decade13° warmer than normal today. The forecast high is 79°, and a typical Oct 1 in Addison peaks around 66°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Addison feels like
Winter
Spring
Summer
Fall
Addison 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 | 34° | 18° | 4.0" | 18.3" | 18 | 20 | 18° – 35° |
| February | 38° | 20° | 3.6" | 16.9" | 15 | 17 | 17° – 38° |
| March | 47° | 27° | 4.2" | 10.3" | 15 | 10 | 31° – 47° |
| April | 60° | 36° | 4.2" | 0.9" | 15 | 1 | 43° – 54° |
| May | 69° | 46° | 5.0" | 0 | 17 | 0 | 51° – 65° |
| June | 76° | 54° | 5.0" | 0 | 15 | 0 | 61° – 67° |
| July | 79° | 58° | 4.8" | 0 | 14 | 0 | 64° – 72° |
| August | 77° | 57° | 4.4" | 0 | 13 | 0 | 63° – 71° |
| September | 72° | 50° | 4.0" | 0 | 12 | 0 | 57° – 66° |
| October | 61° | 39° | 3.5" | 0.2" | 12 | 0 | 47° – 56° |
| November | 49° | 30° | 3.3" | 3.7" | 13 | 3 | 33° – 45° |
| December | 39° | 23° | 4.0" | 10.9" | 16 | 12 | 20° – 42° |
| Year | 58° | 38° | 50.0" | 61.2" | 173 | 62 |
“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 Addison
Addison gets 50 inches of rain and melted snow a year. May is the wettest month and November the driest. Rain or snow falls on about 173 days a year. Snow covers the ground about 62 days of the year.
About 171 frost-free days a year
In half of years the last 32° night comes by April 30 and the first one by October 18. That leaves about 171 frost-free days for gardens, shorter than 59% of U.S. towns.
Heating and cooling a home in Addison
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Addison, 90% of that work is heating and 10% 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.
Addison and its neighbors
Addison borders 6 towns with climate data. January nights across them vary by 2.3°. Elk Lick has the coldest January nights (17°) and Confluence the hottest July afternoons (83°). Addison’s January low is 18° and its July high 79°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Addison 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 Addison averaged 1.1° warmer than the 1900s. The biggest change is in December (+2.3°). The shift is smaller than in 65% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Addison’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 20° to 42°. June is the most reliable, staying within 7°.
Common questions about Addison’s climate
What is the coldest month in Addison?
January, with a typical high of 34° and a low of 18°.
What is the hottest month in Addison?
July, with a typical high of 79° and a low of 58°. About 12 days a year reach 90°.
How much snow does Addison get?
About 61 inches in a normal winter, most of it in January.
When is the first frost in Addison?
In half of years the first 32° night comes by October 18, and the last spring frost by April 30.
What is the rainiest month in Addison?
May, with 5.0 inches of rain and melted snow. The year totals 50 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Addison itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Confluence 1 Sw Dam, PA (4 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.