Photo: Nyttend · Public domainAfternoon heat in Jennerstown trails that of 89% of U.S. towns
Nights in January average 18°. It is a wet place: more rain and snow fall here than on 75% of U.S. towns. The latest 30-year average runs 1.0° warmer than 1901–2000’s, with December up the most. Central heating does most of its work from November to April, in months below 50° on average.
A year in Jennerstown at a glance
Each month’s typical high and low, and what it brings.
What stands out about Jennerstown’s climate
Compared with towns across the U.S., with Jennerstown’s place in Pennsylvania beside it.
What a year in Jennerstown feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 176 frost-free days a year
In half of years the last 32° night comes by April 29 and the first by October 21. Frost and day counts come from NOAA’s station at Johnstown Cambria Co Airport, 16 miles from the town’s center, 400 ft higher.
The 2023 USDA map puts Jennerstown’s center in zone 6a: the coldest night of a typical winter, averaged over 1991–2020, reaches about −9°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 65 inches of snow a winter
Snow, measured at Boswell, PA, falls mostly in February. Precipitation (rain plus melted snow) adds up to 48 inches a year; June is the wettest month and February the driest. Rain or snow falls on about 137 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Jennerstown
93% of the work is heating, so the furnace matters far more than the air conditioner. 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 Johnstown Cambria Co Airport.
Living with Jennerstown’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
176 frost-free days in zone 6a. The last frost comes by Apr 29 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 21.
Months with highs of 62–84° and lows of 40° or more: May, June, July, August and September.
Parks & trails →Of the yearly building losses FEMA expects in Jennerstown from natural hazards, river flooding is the largest share (77%); heat waves, cold waves, winter storms and ice storms together are 2%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Jennerstown and similar climates
TownRatings has no climate map of the towns around Jennerstown yet.
Climates most like Jennerstown’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 |
|---|---|---|---|---|
| Jennerstown, PA | 18° | 81° | 48" | 65" |
| Hampton, NH | 17° | 81° | 48" | 63" |
| Salisbury, MA | 18° | 81° | 48" | 62" |
| Kittery, ME | 16° | 80° | 48" | 56" |
| Mamakating, NY | 17° | 82° | 49" | 58" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Jennerstown averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.3°).
A smaller shift than in 81% 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 Jennerstown compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Jennerstown’s place among Pennsylvania’s.
Jennerstown weather by month
Highs, lows and precipitation from NOAA’s grid at Jennerstown’s center; snow, wet days and snow on the ground from Boswell, PA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 35° | 18° | 3.7" | 17.9" | 15 | 19 | 19° – 36° |
| February | 39° | 20° | 3.3" | 19.9" | 13 | 18 | 17° – 39° |
| March | 47° | 26° | 4.1" | 8.2" | 11 | 8 | 30° – 48° |
| April | 61° | 36° | 4.2" | 1.5" | 12 | 1 | 43° – 54° |
| May | 70° | 46° | 4.5" | 0.0" | 12 | 0 | 51° – 65° |
| June | 77° | 54° | 4.7" | 0.0" | 11 | 0 | 61° – 68° |
| July | 81° | 58° | 4.7" | 0.0" | 10 | 0 | 65° – 74° |
| August | 79° | 56° | 4.2" | 0.0" | 10 | 0 | 64° – 72° |
| September | 73° | 50° | 3.9" | 0.0" | 9 | 0 | 58° – 66° |
| October | 62° | 39° | 3.5" | 0.2" | 10 | 0 | 47° – 56° |
| November | 50° | 30° | 3.4" | 3.8" | 11 | 3 | 33° – 46° |
| December | 39° | 23° | 3.9" | 13.1" | 14 | 13 | 20° – 42° |
| Year | 59° | 38° | 47.9" | 64.6" | 137 | 61 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 17° to 39°. June is the most reliable, staying within 7°.
Where Jennerstown’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 Jennerstown’s center.
- Snow: Boswell, PA (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Johnstown Cambria Co Airport, 16 miles from the town’s center, 400 ft higher; 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 Jennerstown’s climate
What is the weather like in Jennerstown?
A typical July afternoon reaches 81°, a January night drops to 18°, and about 65 inches of snow falls in a normal winter. Colder January nights than 72% of U.S. towns; cooler July afternoons than 89% of U.S. towns.
How cold does it get in Jennerstown in winter?
January nights average 18°. About 127 nights a year reach 32° or below and 3 reach 0° or below. In the coldest January of the last 30 years the month averaged 19°.
How much snow does Jennerstown get?
About 65 inches in a normal winter at Boswell, PA, most of it in February, with snow on the ground about 61 days a year.
How hot does it get in Jennerstown?
July, with a typical high of 81°. 90° days are rare: none in a normal year at Johnstown Cambria Co Airport.
When is the first and last frost in Jennerstown?
In half of years the last spring frost (32°) comes by April 29 and the first fall frost by October 21, about 176 frost-free days, at Johnstown Cambria Co Airport.
What growing zone is Jennerstown in?
Zone 6a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about −9°.
What is the best time of year to visit Jennerstown?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Jennerstown getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 81% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Jennerstown.
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.