Twin Rocks has chilly, snowy winters and pleasant summers, with plenty of rain
A typical July afternoon reaches 80°, a January night drops to 18°, and about 80 inches of snow falls in a normal winter.
A year in Twin Rocks at a glance
Each month’s typical high and low, and what it brings.
What stands out about Twin Rocks’s climate
Read from where Twin Rocks sits among Pennsylvania’s towns. The page puts what stands out first.
80 inches of snow, 48 of rain and melt
July is the wettest month and February the driest. Rain or snow falls on about 177 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Living with Twin Rocks’s climate
What the numbers mean for a garden, a driveway, a furnace and a free afternoon.
136 frost-free days. The last frost comes by May 17 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 2.
About 80" a winter over 30 days with an inch or more, most in January. Snow covers the ground about 70 days a year.
Months averaging under 55° run from October through April. Heating is 96% of the year’s heating-and-cooling load.
About 2 days a year reach 90°, and July afternoons average 80°.
The nicest months are May, June, July, August and September. 0.0 miles of trails are waiting.
Parks & trails →Normals are averages. Ice storms, nor’easters, floods and heat waves are on the natural hazards page.
Natural hazards →What a year in Twin Rocks feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Warmer than it used to be
The last 30 years in Twin Rocks averaged 0.9° warmer than the 1900s. The biggest change is in December (+2.1°).
A smaller shift than in 75% of U.S. towns.
Change by month
About 136 frost-free days a year
In half of years the last 32° night comes by May 17 and the first by October 2.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
Twin Rocks and its neighbors
Blacklick has the coldest January nights next door (18°) and Jackson the hottest July afternoons (80°). Tap a town to see its climate.
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.
How Twin Rocks compares
Against every U.S. town on TownTapestry, each counted once, with its place in Pennsylvania.
Twin Rocks 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 | 33° | 18° | 3.7" | 24.0" | 20 | 21 | 18° – 34° |
| February | 37° | 19° | 3.2" | 19.3" | 16 | 19 | 16° – 36° |
| March | 46° | 26° | 3.9" | 14.1" | 15 | 11 | 29° – 47° |
| April | 59° | 36° | 4.1" | 2.6" | 15 | 1 | 42° – 52° |
| May | 69° | 46° | 4.4" | 0 | 15 | 0 | 51° – 64° |
| June | 77° | 54° | 4.7" | 0 | 14 | 0 | 61° – 68° |
| July | 80° | 58° | 4.8" | 0 | 13 | 0 | 65° – 73° |
| August | 79° | 57° | 4.1" | 0 | 12 | 0 | 64° – 72° |
| September | 72° | 50° | 4.3" | 0 | 11 | 0 | 58° – 66° |
| October | 61° | 39° | 3.5" | 0.7" | 13 | 0 | 46° – 56° |
| November | 48° | 30° | 3.6" | 4.9" | 14 | 4 | 34° – 45° |
| December | 38° | 23° | 4.0" | 14.1" | 18 | 13 | 20° – 41° |
| Year | 58° | 38° | 48.2" | 79.7" | 177 | 70 |
Heating and cooling a home in Twin Rocks
96% of the work is heating, so the furnace matters far more than the air conditioner.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. Source: NOAA station normals.
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 41°. June is the most reliable, staying within 7°.
Common questions about Twin Rocks’s climate
What is the coldest month in Twin Rocks?
January, with a typical high of 33° and a low of 18°.
What is the hottest month in Twin Rocks?
July, with a typical high of 80° and a low of 58°. About 2 days a year reach 90°.
How much snow does Twin Rocks get?
About 80 inches in a normal winter, most of it in January.
When is the first frost in Twin Rocks?
In half of years the first 32° night comes by October 2, and the last spring frost by May 17.
What is the rainiest month in Twin Rocks?
July, with 4.8 inches of rain and melted snow. The year totals 48 inches.
Neighbors talk weather
Gardens, snow, and the best days of the year in Twin Rocks.
Your answer becomes a post in Town Square.
Temperatures and rainfall come from NOAA’s gridded climate normals for Twin Rocks itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Ebensburg Sewage Plt, PA (7 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Today’s forecast: National Weather Service.