State guides · Pennsylvania · Climate by town
Donora, PA rainfall, snowfall and frost dates
Thirty-year averages for Donora from NOAA’s 1991–2020 U.S. Climate Normals: rain and snow by month, the last and first freeze, the growing season, and a frost check for any date.
Donora averages 40.85 in. of precipitation and 21.4 in. of snow a year. The median last spring freeze (32°F) is April 27 and the median first fall freeze is Oct. 22, a growing season of about 177 days. From NOAA’s Donora 1 SW station; checked Nov. 13, 2026.
Is it safe to plant in Donora yet?
Dates from January through July check the last spring freeze. Dates from August on check the first fall freeze.
From NOAA’s freeze probabilities for this station. Low spots and valleys can freeze later in spring and earlier in fall than the station.
Donora frost dates
| 32°F freeze | 9 in 10 years | 1 in 2 years | 1 in 10 years |
|---|---|---|---|
| Last spring freeze comes after | April 11 | April 27 | May 15 |
| First fall freeze comes before | Nov. 4 | Oct. 22 | Oct. 8 |
Hard freeze (28°F): the median last one in spring is April 14 and the median first one in fall is Nov. 1. The growing season between the median 32°F freezes, April 27 to Oct. 22, runs about 177 days.
Planting tender plants after May 15 means a freeze afterward in only about 1 year in 10. Planting on April 27 leaves even odds. For lawn seeding windows, see our Pennsylvania grass seed guide.
Donora rain and snow by month
| Month | Precipitation (in.) | Snow (in.) | Avg high (°F) | Avg low (°F) |
|---|---|---|---|---|
| January | 2.90 | 5.7 | 38.7 | 20.5 |
| February | 2.43 | 7.2 | 42.1 | 21.8 |
| March | 3.14 | 4.6 | 50.9 | 28.6 |
| April | 3.40 | 0.1 | 64.0 | 38.4 |
| May | 4.30 | 0.0 | 73.1 | 49.0 |
| June | 4.39 | 0.0 | 80.7 | 58.1 |
| July | 4.31 | 0.0 | 84.4 | 62.2 |
| August | 3.64 | 0.0 | 83.5 | 60.7 |
| September | 3.55 | 0.0 | 77.5 | 53.9 |
| October | 3.05 | 0.0 | 66.0 | 42.2 |
| November | 2.84 | 0.5 | 53.7 | 32.5 |
| December | 2.90 | 3.3 | 43.2 | 25.7 |
| Year | 40.85 | 21.4 | Average 52.1°F | |
Precipitation is rain plus the water in melted snow and ice. Snow is the depth of new snowfall. Monthly figures are NOAA’s normals and may not add exactly to the yearly totals because of rounding.
- Wettest month: June, 4.39 in. Driest: February, 2.43 in.
- Snowiest month: February, 7.2 in. Months averaging 1 in. or more: December through March. December through February bring about 76% of the year’s snow.
- Average lows at or below 32°F: December through March.
- Coldest nights: January, average low 20.5°F. Warmest days: July, average high 84.4°F.
Planning outdoor work in Donora
Average lows sit at or below freezing from December through March, so plan base work, planting and seeding around the frost dates above. Frost depth and ground snow load for footings and roofs are set by your town; our design criteria by ZIP tool shows who sets them for your address. For planting beds, start with a soil test.
Towns near Donora
| Town | Miles | Precip. (in.) | Snow (in.) | Median last freeze | Median first freeze |
|---|---|---|---|---|---|
| Washington | 17 | 41.34 | 31.9 | April 24 | Oct. 23 |
| Uniontown | 19 | 44.35 | 28.1 | April 30 | Oct. 18 |
| Mount Pleasant | 20 | 43.94 | 29.8 | May 1 | Oct. 13 |
| Waynesburg | 24 | 43.07 | 30.1 | May 3 | Oct. 15 |
| Pittsburgh | 29 | 39.61 | 44.1 | April 23 | Oct. 23 |
| Confluence | 37 | 47.21 | 61.2 | April 30 | Oct. 18 |
Miles are straight-line distances between NOAA stations. See every town on our Pennsylvania rainfall and snowfall by town chart.
Questions
How much snow does Donora, PA get a year?
Donora averages 21.4 in. of snow a year, per NOAA’s 1991–2020 normals for its Donora 1 SW station. The snowiest month is February, at 7.2 in.
How much rain does Donora, PA get a year?
Donora averages 40.85 in. of precipitation a year, counting rain and melted snow. The wettest month is June, at 4.39 in.
When is the last frost in Donora, PA?
The median last 32°F freeze in Donora is April 27. In 1 year in 10 it comes after May 15, and in 9 years in 10 after April 11.
When is the first frost in Donora, PA?
The median first 32°F freeze in Donora is Oct. 22. In 1 year in 10 it comes before Oct. 8, and in 9 years in 10 before Nov. 4.
How long is the growing season in Donora?
About 177 days between the median last and first 32°F freezes, April 27 to Oct. 22.
What is the coldest month in Donora?
January, with an average low of 20.5°F and an average high of 38.7°F.
About this data
Station: NOAA’s Donora 1 SW station (GHCN USC00362190), about 1 mile southwest of Donora, elevation 762 ft, 40.164° N, 79.869° W. These are NOAA’s 1991–2020 U.S. Climate Normals, 30-year averages that NOAA recomputes every 10 years. NOAA rates this station’s precipitation normals standard, its snow normals provisional and its temperature and freeze normals representative. Standard means at least 24 years of data, with missing months filled from nearby stations. Provisional means at least 10 years of data, with gaps NOAA could not fill from nearby stations. Representative means at least 10 years of data, with missing months filled from nearby stations.
Your yard can differ from the station. Elevation, valleys and hillsides change how much snow falls and when the first and last freezes come.
Sources: NOAA NCEI, U.S. Climate Normals; annual and seasonal normals for USC00362190; monthly normals for USC00362190; NOAA normals file documentation. Checked Nov. 13, 2026.
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Muthler Landscaping & Construction LLC · 913 Bellefonte Ave, Lock Haven, PA 17745 · (570) 397-9800 · PA HIC #PA212584. Climate data from NOAA; not a forecast.
Using this guide? Link to it or cite it. It's free to use with a link back, and we keep it updated against official sources.
Cite as: Muthler Landscaping & Construction, “Donora, PA Rainfall, Snowfall and Frost Dates,” https://muthlerlandscaping.com/state-guides/pennsylvania/climate/donora/ (last checked November 13, 2026).
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