Johnstown, Pennsylvania climate: Normal weather by month, frost dates and records
Johnstown's normal year runs from 19°F January nights to 79°F July afternoons, with 41.3 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.4°C, January lows of −7°C, July highs of 26°C, 1,048 mm of precipitation a year.
- NOAA stationJohnstown Cambria County Airport
- Station IDUSW00004726
- Location40.32°N 78.83°W
- Elevation2,284 ft (696 m)
- From the center5 miles
- Population17,853
On October 14, the normal high in Johnstown is 60°F and the normal low 43°F, and the chance of measurable rain or snow is 46%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Johnstown.
- Jan 33° 19°
- Feb 36° 21°
- Mar 45° 28°
- Apr 58° 38°
- May 68° 49°
- Jun 75° 57°
- Jul 79° 61°
- Aug 77° 60°
- Sep 71° 53°
- Oct 59° 43°
- Nov 47° 33°
- Dec 38° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Johnstown each month?
July is the warmest month, with normal highs of 79°F; January the coldest, with normal lows of 19°F. The most precipitation falls in June (4.40 in), the least in February (2.53 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 33°F | 19°F | 26.3°F | 2.54 | 15 | <1 | 27 | 9 h 40 min |
| February | 36°F | 21°F | 28.7°F | 2.53 | 14 | <1 | 25 | 10 h 40 min |
| March | 45°F | 28°F | 36.4°F | 3.12 | 14 | <1 | 21 | 11 h 50 min |
| April | 58°F | 38°F | 48.1°F | 3.54 | 14 | <1 | 9 | 13 h 10 min |
| May | 68°F | 49°F | 58.5°F | 4.12 | 17 | <1 | 1 | 14 h 20 min |
| June | 75°F | 57°F | 66.0°F | 4.40 | 15 | <1 | <1 | 15 h |
| July | 79°F | 61°F | 69.9°F | 4.22 | 15 | <1 | <1 | 14 h 50 min |
| August | 77°F | 60°F | 68.6°F | 3.95 | 14 | <1 | <1 | 13 h 50 min |
| September | 71°F | 53°F | 61.6°F | 3.99 | 12 | <1 | <1 | 12 h 30 min |
| October | 59°F | 43°F | 51.1°F | 3.06 | 15 | <1 | 4 | 11 h 10 min |
| November | 47°F | 33°F | 40.1°F | 3.11 | 13 | <1 | 16 | 10 h |
| December | 38°F | 25°F | 31.2°F | 2.68 | 15 | <1 | 25 | 9 h 20 min |
| Year (annual) | 57°F | 41°F | 48.9°F | 41.26 | 171 | <1 | 127 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 1°C | −7°C | −3.2°C | 65 mm |
| February | 2°C | −6°C | −1.8°C | 64 mm |
| March | 7°C | −2°C | 2.4°C | 79 mm |
| April | 14°C | 4°C | 8.9°C | 90 mm |
| May | 20°C | 9°C | 14.7°C | 105 mm |
| June | 24°C | 14°C | 18.9°C | 112 mm |
| July | 26°C | 16°C | 21.1°C | 107 mm |
| August | 25°C | 16°C | 20.3°C | 100 mm |
| September | 21°C | 12°C | 16.4°C | 101 mm |
| October | 15°C | 6°C | 10.6°C | 78 mm |
| November | 9°C | 0°C | 4.5°C | 79 mm |
| December | 3°C | −4°C | −0.4°C | 68 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Ebensburg (12 miles away), gets 80 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004726; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Johnstown?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, September has the fewest days with rain (12).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004726.
When is the last frost in Johnstown?
In Johnstown, the last spring frost (32°F) comes after April 29 in half of years and after May 17 in one year in ten; the first autumn frost comes before October 21 in half of years and before October 5 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 291 year in 10 after May 17; 9 in 10 after April 14
- First autumn frost, half of years before
- October 211 year in 10 before October 5; 9 in 10 before November 5
NOAA puts the median frost-free season at 176 days, and the season without a hard freeze (28°F) at 200 days.
A hard freeze (28°F) comes after April 17 in half of springs and before November 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Johnstown in zone 6b across its 2 ZIP code areas (6b in 15902, the largest). By the map's own method, the average of each year's coldest night over 1991-2020, Johnstown's NOAA station is in zone 6b: the coldest night of a typical year reaches −2°F (20 complete years).
Frost dates for every NOAA station in Pennsylvania · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00004726; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
What hardiness zone is each Johnstown ZIP code in?
The USDA's 2023 map gives each ZIP code area one zone. Johnstown's 2 ZIP code areas are all in zone 6b. Each ZIP's frost dates are in the frost tool.
Source: USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; ZIP areas in the place: Census Bureau 2020 ZCTA-to-place relationship file. A ZIP area counts when at least a tenth of its land (and 0.5 km²) lies in the place.
How hot and how cold does it get in Johnstown?
In a normal year in Johnstown, a 90°F day is rare, 127 nights fall to 32°F or colder and 171 days bring measurable precipitation.
- Days at 90°F or more
- fewer than 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 127a normal year
- Days that stay below freezing
- 52high of 32°F or less
- Days with 0.01 inch of precipitation
- 171a normal year
The highest temperature in this station's record (since 2000) is 94°F, on July 22, 2011; the lowest is −14°F, on January 7, 2014.
The wettest calendar year on that record is 2018, with 61.51 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00004726; records: ACIS (NOAA Regional Climate Centers), station USW00004726. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Johnstown, and how clear are its skies?
The summer (June-August) dew point averages 58°F. The muggiest month is July, with an average dew point of 60°F; the driest air comes in January (18°F). December is the windiest month (11.4 mph on average).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 18°F | 73% | 66% | 11.3 mph | – | – |
| February | 21°F | 69% | 61% | 11.2 mph | – | – |
| March | 30°F | 63% | 52% | 10.5 mph | – | – |
| April | 39°F | 61% | 47% | 9.4 mph | – | – |
| May | 52°F | 69% | 55% | 7.9 mph | – | – |
| June | 58°F | 71% | 56% | 7.3 mph | – | – |
| July | 60°F | 73% | 57% | 6.8 mph | – | – |
| August | 57°F | 74% | 57% | 6.5 mph | – | – |
| September | 48°F | 75% | 60% | 7.9 mph | – | – |
| October | 35°F | 68% | 56% | 9.6 mph | – | – |
| November | 27°F | 73% | 65% | 10.8 mph | – | – |
| December | 22°F | 76% | 69% | 11.4 mph | – | – |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00004726. Monthly averages of all hours; afternoon humidity at 3 p.m. local standard time; sky as the share of hours NOAA's observations rate clear or few clouds (a dash where NOAA publishes no sky value).
How sunny is Johnstown?
Over a year 68% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Johnstown, 3.7 kWh per square metre a day. July is the sunniest month (75%) and December the cloudiest (53%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 56% | 1.6 |
| February | 60% | 2.5 |
| March | 62% | 3.4 |
| April | 66% | 4.6 |
| May | 67% | 5.2 |
| June | 72% | 5.8 |
| July | 75% | 5.8 |
| August | 75% | 5.2 |
| September | 73% | 4.2 |
| October | 66% | 2.9 |
| November | 65% | 2.0 |
| December | 53% | 1.4 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Johnstown need?
A normal year in Johnstown brings 6,324 heating degree days, 18% more than the median U.S. place (5,373), and 479 cooling degree days, 47% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,605 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,200 | 0 |
| February | 1,015 | 0 |
| March | 889 | 0 |
| April | 511 | 6 |
| May | 233 | 32 |
| June | 59 | 91 |
| July | 13 | 165 |
| August | 24 | 134 |
| September | 147 | 45 |
| October | 439 | 7 |
| November | 747 | 0 |
| December | 1,048 | 0 |
| Year (annual) | 6,324 | 479 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00004726. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Has Johnstown been warmer than normal lately?
2025 averaged 49.0°F, 0.1°F above the 1991-2020 normal of 48.9°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 50.4°F | +1.5°F | 43.84 |
| 2022 | 49.1°F | +0.2°F | 42.96 |
| 2023 | 51.0°F | +2.1°F | 43.74 |
| 2024 | 51.8°F | +2.9°F | 48.50 |
| 2025 | 49.0°F | +0.1°F | 39.28 |
Source: observed years: ACIS, station USW00004726. A year counts only with all twelve months complete.
How does Johnstown's climate compare?
Johnstown is warmer than 36 of the other 107 places with their own NOAA record in Pennsylvania, and wetter than 16. Across the 7,247 U.S. stations with normals, its annual mean of 48.9°F is warmer than 36%.
In the Köppen classification computed from these normals, Johnstown is Dfb: continental, no dry season, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Johnstown share this climate record?
33 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Westmont, PA4,795 people · 6 mi W
- Elim, PA3,828 people · 6 mi W
- Windber, PA3,807 people · 6 mi S
- Belmont, PA2,624 people · 4 mi SW
- Geistown, PA2,296 people · 3 mi SW
- Southmont, PA1,985 people · 5 mi W
- Oakland, PA1,732 people · 3 mi W
- Westwood, PA1,590 people · 6 mi W
- Vinco, PA1,567 people · 7 mi N
- Ferndale, PA1,501 people · 5 mi W
- University of Pittsburgh Johnstown, PA1,394 people · 4 mi S
- Salix, PA1,339 people · 4 mi E
- East Conemaugh, PA1,052 people · 3 mi NW
- Davidsville, PA970 people · 8 mi SW
- Dale, PA960 people · 4 mi W
- South Fork, PA917 people · 4 mi NE
- Paint, PA882 people · 5 mi S
- Beaverdale, PA808 people · 7 mi E
- Scalp Level, PA722 people · 5 mi S
- Brownstown, PA672 people · 6 mi W
- New Florence, PA655 people · 13 mi W
- Lorain, PA577 people · 4 mi SW
- Dunlo, PA504 people · 6 mi E
- Summerhill, PA463 people · 6 mi NE
- Seward, PA399 people · 12 mi NW
- Parkhill, PA385 people · 4 mi NW
- St. Michael, PA349 people · 4 mi E
- Sidman, PA317 people · 4 mi E
- Daisytown, PA284 people · 4 mi W
- Franklin, PA267 people · 3 mi NW
- Riverside, PA262 people · 5 mi SW
- Ehrenfeld, PA198 people · 5 mi NE
- Benson, PA179 people · 9 mi SW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Johnstown's climate
What is the coldest month in Johnstown?
January, with a normal high of 33°F and a normal low of 19°F. The warmest is July (79°F by day, 61°F at night).
Does it snow in Johnstown?
Yes. NOAA publishes no 1991-2020 snowfall normal for Johnstown's NOAA station; the nearest record that keeps one, Ebensburg (12 miles away), records 80 inches of snow in a normal year.
What is the rainiest month in Johnstown?
June, with 4.40 in of precipitation in a normal year; the driest is February with 2.53 in.
What plant hardiness zone is Johnstown in?
The USDA's 2023 map puts Johnstown in zone 6b across its 2 ZIP code areas (6b in 15902, the largest). By the same method at Johnstown's NOAA station, the coldest night of a typical year reaches −2°F (20 years, 1991-2020): zone 6b.
How late can frost come in Johnstown?
In half of years the last 32°F night comes after April 29; in one year in ten it comes after May 17. Waiting until May 17 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Johnstown in OctoberThis month day by day, its records and recent years
- Pennsylvania climateThe statewide normals and every place in the state
- Ebensburg, PA12 miles from this station, 46.6°F a year
- Laurel Summit, PA19 miles from this station, 45.6°F a year
- Laurel Mountain, PA21 miles from this station, 49.6°F a year
- Shawnee State Park, PA22 miles from this station, 49.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made