Summer arrives softly in Klahr, cooler than in 91% of U.S. towns
January mornings start at about 18°. Winter nights are cold: in January they are colder than in 69% of U.S. towns. Decade by decade the climate has edged up, 1.1° above 1901–2000. Homes need heating from November to April, the months averaging under 50°.
A year in Klahr at a glance
Each month’s typical high and low, and what it brings.
What stands out about Klahr’s climate
Compared with towns across the U.S., with Klahr’s place in Pennsylvania beside it.
What a year in Klahr feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 177 frost-free days a year
In half of years the last 32° night comes by April 23 and the first by October 21. Frost and day counts come from NOAA’s station at Altoona Blair Co Airport, 10 miles from the town’s center, 380 ft lower.
The 2023 USDA map puts Klahr’s center in zone 6b: 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 38 inches of snow a winter
Snow, measured at Altoona 3 W, PA, is heaviest from January through February, about 11 inches a month. Precipitation (rain plus melted snow) adds up to 44 inches a year; May is the wettest month and February the driest. Rain or snow falls on about 159 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Klahr
89% 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 Altoona Blair Co Airport.
Living with Klahr’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
177 frost-free days in zone 6b. The last frost comes by Apr 23 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 Klahr from natural hazards, river flooding is the largest share (86%); heat waves, cold waves, winter storms and ice storms together are 3%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Klahr and similar climates
TownRatings has no climate map of the towns around Klahr yet.
Climates most like Klahr’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 |
|---|---|---|---|---|
| Klahr, PA | 18° | 80° | 44" | 38" |
| Marblehead, MA | 20° | 80° | 48" | 39" |
| Durham, NH | 16° | 81° | 47" | 39" |
| Aurora, OH | 19° | 82° | 42" | 45" |
| North Stonington, CT | 20° | 82° | 47" | 38" |
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 Klahr averaged 1.1° warmer than the 1900s. The biggest change is in February (+2.0°).
A smaller shift than in 73% 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 Klahr compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Klahr’s place among Pennsylvania’s.
Klahr weather by month
Highs, lows and precipitation from NOAA’s grid at Klahr’s center; snow, wet days and snow on the ground from Altoona 3 W, PA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 34° | 18° | 3.0" | 10.1" | 15 | 16 | 17° – 35° |
| February | 37° | 19° | 2.6" | 11.0" | 12 | 15 | 16° – 36° |
| March | 46° | 26° | 3.6" | 7.6" | 12 | 8 | 30° – 47° |
| April | 59° | 37° | 3.8" | 0.6" | 14 | 0 | 42° – 53° |
| May | 69° | 47° | 4.3" | 0.0" | 16 | 0 | 52° – 65° |
| June | 76° | 55° | 4.1" | 0.0" | 13 | 0 | 62° – 68° |
| July | 80° | 60° | 4.1" | 0.0" | 13 | 0 | 66° – 74° |
| August | 79° | 58° | 3.8" | 0.0" | 11 | 0 | 65° – 72° |
| September | 72° | 52° | 4.2" | 0.0" | 12 | 0 | 59° – 66° |
| October | 60° | 41° | 3.5" | 0.0" | 13 | 0 | 47° – 57° |
| November | 48° | 31° | 3.2" | 1.2" | 14 | 2 | 34° – 45° |
| December | 38° | 23° | 3.3" | 7.6" | 14 | 10 | 20° – 41° |
| Year | 58° | 39° | 43.5" | 38.1" | 159 | 50 |
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°.
Where Klahr’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 Klahr’s center.
- Snow: Altoona 3 W, PA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Altoona Blair Co Airport, 10 miles from the town’s center, 380 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 Klahr’s climate
What is the weather like in Klahr?
A typical July afternoon reaches 80°, a January night drops to 18°, and about 38 inches of snow falls in a normal winter. Colder January nights than 69% of U.S. towns; cooler July afternoons than 91% of U.S. towns.
How cold does it get in Klahr in winter?
January nights average 18°. About 118 nights a year reach 32° or below and 2 reach 0° or below. In the coldest January of the last 30 years the month averaged 17°.
How much snow does Klahr get?
About 38 inches in a normal winter at Altoona 3 W, PA, heaviest from January through February, about 11 inches a month, with snow on the ground about 50 days a year.
How hot does it get in Klahr?
July, with a typical high of 80° and a low of 60°. About 8 days a year reach 90° (Altoona Blair Co Airport).
When is the first and last frost in Klahr?
In half of years the last spring frost (32°) comes by April 23 and the first fall frost by October 21, about 177 frost-free days, at Altoona Blair Co Airport.
What growing zone is Klahr in?
Zone 6b 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 Klahr?
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 Klahr getting warmer?
Yes: 1991–2020 averaged 1.1° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 73% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Klahr.
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.