Photo: Badagnani · CC BY-SA 3.0Weather without surprises: Upper Allen Township keeps close to the norm for U.S. towns
Midsummer highs settle at about 86°. From frosty January to warm July, readings climb 64°. Long walks are most pleasant from April to June and August to October, when afternoons reach 63–84°.
A year in Upper Allen Township at a glance
Each month’s typical high and low, and what it brings.
What stands out about Upper Allen Township’s climate
Compared with towns across the U.S., with Upper Allen Township’s place in Pennsylvania beside it.
What a year in Upper Allen Township feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 206 frost-free days a year
In half of years the last 32° night comes by April 9 and the first by November 2. Day counts come from NOAA’s station at Harrisburg Cptl Cy Airport, 7 miles from the town’s center, 130 ft lower; frost dates and degree days from Middletown Harrisburg International Airport, 12 miles away.
The 2023 USDA map puts Upper Allen Township’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 3°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 30 inches of snow a winter
Snow, measured at Middletown Harrisburg International Airport, is heaviest from January through February, about 9 inches a month. Precipitation (rain plus melted snow) adds up to 44 inches a year; September is the wettest month and February the driest. Rain or snow falls on about 126 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Upper Allen Township
81% of the work is heating. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Middletown Harrisburg International Airport.
Living with Upper Allen Township’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
206 frost-free days in zone 7a. The last frost comes by Apr 9 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 2.
Months with highs of 62–84° and lows of 40° or more: April, May, June, August, September and October. 13 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Upper Allen Township from natural hazards, river flooding is the largest share (66%); heat waves, cold waves, winter storms and ice storms together are 8%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Upper Allen Township and its neighbors
Every town next door is within a degree of Upper Allen Township in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Upper Allen Township’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Upper Allen Township, PA | 22° | 86° | 44" | 30" |
| Gahanna, OH | 21° | 85° | 42" | 28" |
| New Martinsville, WV | 22° | 85° | 46" | 27" |
| Highland Heights, KY | 23° | 86° | 45" | 23" |
| Lawrenceburg, IN | 23° | 86° | 45" | 23" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Upper Allen Township averaged 1.8° warmer than the 1900s. The biggest change is in December (+3.2°).
A bigger shift than in 78% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Upper Allen Township compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Upper Allen Township’s place among Pennsylvania’s.
Upper Allen Township weather by month
Highs, lows and precipitation from NOAA’s grid at Upper Allen Township’s center; snow, wet days and snow on the ground from Middletown Harrisburg International Airport. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 22° | 3.0" | 9.1" | 11 | 9 | 20° – 38° |
| February | 41° | 24° | 2.6" | 9.4" | 10 | 9 | 21° – 41° |
| March | 51° | 31° | 3.6" | 5.6" | 11 | 4 | 35° – 51° |
| April | 63° | 41° | 3.7" | 0.4" | 11 | 0 | 48° – 57° |
| May | 73° | 51° | 3.8" | 0.0" | 13 | 0 | 57° – 68° |
| June | 81° | 60° | 4.0" | 0.0" | 12 | 0 | 67° – 74° |
| July | 86° | 65° | 4.2" | 0.0" | 11 | 0 | 71° – 80° |
| August | 84° | 63° | 3.9" | 0.0" | 10 | 0 | 69° – 77° |
| September | 77° | 56° | 4.4" | 0.0" | 9 | 0 | 63° – 71° |
| October | 65° | 44° | 3.8" | 0.2" | 9 | 0 | 50° – 61° |
| November | 53° | 35° | 3.2" | 0.8" | 9 | 0 | 38° – 49° |
| December | 43° | 27° | 3.4" | 4.4" | 10 | 4 | 26° – 45° |
| Year | 63° | 43° | 43.8" | 29.9" | 126 | 26 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 21° to 41°. June is the most reliable, staying within 7°.
Where Upper Allen Township’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Upper Allen Township’s center.
- Snow: Middletown Harrisburg International Airport.
- Frost dates, heating and cooling: Middletown Harrisburg International Airport, 12 miles away.
- Freezing nights, 90° and 100° days: Harrisburg Cptl Cy Airport, 7 miles from the town’s center, 130 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Upper Allen Township’s climate
What is the weather like in Upper Allen Township?
A typical July afternoon reaches 86°, a January night drops to 22°, and about 30 inches of snow falls in a normal winter. Milder January nights than 53% of U.S. towns; hotter July afternoons than 55% of U.S. towns.
How cold does it get in Upper Allen Township in winter?
January nights average 22°. About 102 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 20°.
How much snow does Upper Allen Township get?
About 30 inches in a normal winter at Middletown Harrisburg International Airport, heaviest from January through February, about 9 inches a month, with snow on the ground about 26 days a year.
How hot does it get in Upper Allen Township?
July, with a typical high of 86° and a low of 65°. About 26 days a year reach 90° (Middletown Harrisburg International Airport).
When is the first and last frost in Upper Allen Township?
In half of years the last spring frost (32°) comes by April 9 and the first fall frost by November 2, about 206 frost-free days, at Middletown Harrisburg International Airport.
What growing zone is Upper Allen Township in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 3°.
What is the best time of year to visit Upper Allen Township?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Upper Allen Township getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 78% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Upper Allen Township.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.