Upper Mifflin, PA climate
Upper Mifflin has chilly, snowy winters and warm summers. A typical July afternoon reaches 86°, a January night drops to 22°, and about 34 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Upper Mifflin feels like
Winter
Spring
Summer
Fall
Upper Mifflin 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° | 2.9" | 9.8" | 11 | 11 | 21° – 38° |
| February | 42° | 24° | 2.5" | 10.3" | 10 | 12 | 21° – 40° |
| March | 51° | 30° | 3.6" | 6.7" | 11 | 5 | 35° – 51° |
| April | 64° | 40° | 3.7" | 0.4" | 12 | 0 | 48° – 57° |
| May | 73° | 50° | 4.1" | 0 | 13 | 0 | 56° – 68° |
| June | 82° | 59° | 4.1" | 0 | 12 | 0 | 66° – 73° |
| July | 86° | 64° | 3.9" | 0 | 11 | 0 | 70° – 79° |
| August | 84° | 62° | 3.6" | 0 | 10 | 0 | 69° – 77° |
| September | 77° | 55° | 4.3" | 0 | 10 | 0 | 63° – 69° |
| October | 65° | 43° | 3.7" | 0.2" | 9 | 0 | 50° – 61° |
| November | 53° | 34° | 3.1" | 0.8" | 9 | 1 | 37° – 49° |
| December | 42° | 27° | 3.3" | 5.4" | 10 | 5 | 26° – 44° |
| Year | 63° | 42° | 42.6" | 33.6" | 126 | 35 |
“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 Upper Mifflin
Upper Mifflin gets 43 inches of rain and melted snow a year. September is the wettest month and February the driest. Rain or snow falls on about 126 days a year. Snow covers the ground about 35 days of the year.
About 188 frost-free days a year
In half of years the last 32° night comes by April 19 and the first one by October 24. That leaves about 188 frost-free days for gardens, longer than 62% of U.S. towns.
Heating and cooling a home in Upper Mifflin
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Upper Mifflin, 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.
Upper Mifflin and its neighbors
Upper Mifflin borders 4 towns with climate data. January nights across them vary by 1.4°. Toboyne has the coldest January nights (21°) and Hopewell the hottest July afternoons (87°). Upper Mifflin’s January low is 22° and its July high 86°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Upper Mifflin 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 Upper Mifflin averaged 1.5° warmer than the 1900s. The biggest change is in December (+2.7°). The shift is larger than in 70% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Upper Mifflin’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 40°. June is the most reliable, staying within 7°.
Common questions about Upper Mifflin’s climate
What is the coldest month in Upper Mifflin?
January, with a typical high of 38° and a low of 22°.
What is the hottest month in Upper Mifflin?
July, with a typical high of 86° and a low of 64°. About 30 days a year reach 90°.
How much snow does Upper Mifflin get?
About 34 inches in a normal winter, most of it in February.
When is the first frost in Upper Mifflin?
In half of years the first 32° night comes by October 24, and the last spring frost by April 19.
What is the rainiest month in Upper Mifflin?
September, with 4.3 inches of rain and melted snow. The year totals 43 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Upper Mifflin itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Shippensburg, PA (9 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.