Photo: Nyttend · Public domainCasselman gets about 96 inches of snow a winter, more than 97% of U.S. towns
Expect July afternoons of about 80°. By July afternoons alone, it runs cooler than 93% of U.S. towns. December has warmed most since 1901–2000, part of a 1.0° rise. The frost-free window for a garden runs roughly April 30 to October 18.
A year in Casselman at a glance
Each month’s typical high and low, and what it brings.
What stands out about Casselman’s climate
Compared with towns across the U.S., with Casselman’s place in Pennsylvania beside it.
What a year in Casselman feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 171 frost-free days a year
In half of years the last 32° night comes by April 30 and the first by October 18. Frost and day counts come from NOAA’s station at Confluence 1 Sw Dam, PA, 10 miles from the town’s center, 340 ft lower.
The 2023 USDA map puts Casselman’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°
90° days by month
Average days at 90° or more
About 96 inches of snow a winter
Snow, measured at Somerset, PA, falls mostly in January. Precipitation (rain plus melted snow) adds up to 51 inches a year; June is the wettest month and November the driest. Rain or snow falls on about 179 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Casselman
90% 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 Confluence 1 Sw Dam, PA.
Living with Casselman’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
171 frost-free days in zone 6a. The last frost comes by Apr 30 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 18.
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 Casselman from natural hazards, river flooding is the largest share (83%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Casselman and its neighbors
Every town next door is within a degree of Casselman in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Casselman’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 |
|---|---|---|---|---|
| Casselman, PA | 18° | 80° | 51" | 96" |
| Ellicott, NY | 16° | 80° | 45" | 98" |
| Yarmouth, ME | 14° | 79° | 49" | 84" |
| Spencer, MA | 16° | 80° | 51" | 73" |
| Chardon, OH | 18° | 81° | 45" | 114" |
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 Casselman averaged 1.0° warmer than the 1900s. The biggest change is in December (+2.4°).
A smaller shift than in 77% 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 Casselman compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Casselman’s place among Pennsylvania’s.
Casselman weather by month
Highs, lows and precipitation from NOAA’s grid at Casselman’s center; snow, wet days and snow on the ground from Somerset, PA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 35° | 18° | 4.0" | 27.6" | 19 | 21 | 18° – 36° |
| February | 38° | 20° | 3.6" | 23.6" | 16 | 19 | 17° – 38° |
| March | 47° | 26° | 4.2" | 15.4" | 16 | 10 | 31° – 47° |
| April | 60° | 36° | 4.3" | 3.1" | 16 | 2 | 43° – 54° |
| May | 70° | 45° | 5.0" | 0.0" | 16 | 0 | 51° – 65° |
| June | 76° | 54° | 5.1" | 0.0" | 15 | 0 | 61° – 67° |
| July | 80° | 58° | 4.9" | 0.0" | 13 | 0 | 64° – 73° |
| August | 78° | 56° | 4.4" | 0.0" | 13 | 0 | 63° – 72° |
| September | 72° | 49° | 4.2" | 0.0" | 11 | 0 | 58° – 65° |
| October | 61° | 38° | 3.5" | 0.9" | 13 | 0 | 47° – 56° |
| November | 49° | 30° | 3.5" | 5.9" | 14 | 4 | 33° – 45° |
| December | 39° | 23° | 4.1" | 19.7" | 18 | 14 | 20° – 42° |
| Year | 59° | 38° | 50.6" | 96.2" | 179 | 70 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 20° to 42°. June is the most reliable, staying within 7°.
Where Casselman’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 Casselman’s center.
- Snow: Somerset, PA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Confluence 1 Sw Dam, PA, 10 miles from the town’s center, 340 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 Casselman’s climate
What is the weather like in Casselman?
A typical July afternoon reaches 80°, a January night drops to 18°, and about 96 inches of snow falls in a normal winter. Colder January nights than 69% of U.S. towns; cooler July afternoons than 93% of U.S. towns.
How cold does it get in Casselman in winter?
January nights average 18°. About 148 nights a year reach 32° or below and 6 reach 0° or below. In the coldest January of the last 30 years the month averaged 18°.
How much snow does Casselman get?
About 96 inches in a normal winter at Somerset, PA, most of it in January, with snow on the ground about 70 days a year.
How hot does it get in Casselman?
July, with a typical high of 80° and a low of 58°. About 12 days a year reach 90° (Confluence 1 Sw Dam, PA).
When is the first and last frost in Casselman?
In half of years the last spring frost (32°) comes by April 30 and the first fall frost by October 18, about 171 frost-free days, at Confluence 1 Sw Dam, PA.
What growing zone is Casselman 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 Casselman?
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 Casselman getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 77% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Casselman.
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.