Stevenson Dam, Pennsylvania climate: Climate normals at a NOAA weather station
Stevenson Dam's normal year runs from 16°F January nights to 81°F July afternoons, with 43.1 inches of precipitation and 39 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.5°C, January lows of −9°C, July highs of 27°C, 1,096 mm of precipitation a year.
- NOAA stationStevenson Dam
- Station IDUSC00368469
- Location41.40°N 78.02°W
- Elevation932 ft (284 m)
On October 23, the normal high in Stevenson Dam is 58°F and the normal low 36°F, and the chance of measurable rain or snow is 42%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Stevenson Dam.
- Jan 33° 16°
- Feb 36° 16°
- Mar 45° 23°
- Apr 59° 33°
- May 70° 43°
- Jun 77° 53°
- Jul 81° 57°
- Aug 80° 56°
- Sep 73° 50°
- Oct 61° 38°
- Nov 48° 29°
- Dec 37° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Stevenson Dam each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 16°F. The most precipitation falls in July (4.46 in), the least in February (2.40 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 33°F | 16°F | 24.1°F | 2.80 | 10.7 | 15 | <1 | 29 | 9 h 30 min |
| February | 36°F | 16°F | 25.8°F | 2.40 | 10.7 | 12 | <1 | 26 | 10 h 40 min |
| March | 45°F | 23°F | 34.0°F | 3.26 | 5.7 | 12 | <1 | 25 | 11 h 50 min |
| April | 59°F | 33°F | 45.5°F | 3.85 | 1.0 | 13 | <1 | 15 | 13 h 20 min |
| May | 70°F | 43°F | 56.3°F | 3.83 | 0.0 | 14 | <1 | 3 | 14 h 30 min |
| June | 77°F | 53°F | 64.9°F | 4.07 | 0.0 | 13 | 2 | <1 | 15 h 10 min |
| July | 81°F | 57°F | 69.2°F | 4.46 | 0.0 | 12 | 4 | <1 | 14 h 50 min |
| August | 80°F | 56°F | 68.1°F | 3.86 | 0.0 | 11 | 3 | <1 | 13 h 50 min |
| September | 73°F | 50°F | 61.5°F | 4.28 | 0.0 | 11 | 1 | <1 | 12 h 30 min |
| October | 61°F | 38°F | 49.6°F | 3.71 | 0.1 | 13 | <1 | 7 | 11 h 10 min |
| November | 48°F | 29°F | 38.6°F | 3.32 | 1.8 | 12 | <1 | 20 | 9 h 50 min |
| December | 37°F | 22°F | 29.6°F | 3.30 | 8.6 | 14 | <1 | 27 | 9 h 10 min |
| Year (annual) | 58°F | 36°F | 47.3°F | 43.14 | 38.6 | 153 | 9 | 151 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −9°C | −4.4°C | 71 mm | 27 cm |
| February | 2°C | −9°C | −3.4°C | 61 mm | 27 cm |
| March | 7°C | −5°C | 1.1°C | 83 mm | 14 cm |
| April | 15°C | 0°C | 7.5°C | 98 mm | 3 cm |
| May | 21°C | 6°C | 13.5°C | 97 mm | 0 cm |
| June | 25°C | 12°C | 18.3°C | 103 mm | 0 cm |
| July | 27°C | 14°C | 20.7°C | 113 mm | 0 cm |
| August | 27°C | 14°C | 20.1°C | 98 mm | 0 cm |
| September | 23°C | 10°C | 16.4°C | 109 mm | 0 cm |
| October | 16°C | 3°C | 9.8°C | 94 mm | 0 cm |
| November | 9°C | −2°C | 3.7°C | 84 mm | 5 cm |
| December | 3°C | −5°C | −1.3°C | 84 mm | 22 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00368469; 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.
Which months are mildest at Stevenson Dam?
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 (11).
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 USC00368469.
When is the last frost at Stevenson Dam?
In Stevenson Dam, the last spring frost (32°F) comes after May 10 in half of years and after May 27 in one year in ten; the first autumn frost comes before October 16 in half of years and before October 2 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
- May 101 year in 10 after May 27; 9 in 10 after April 25
- First autumn frost, half of years before
- October 161 year in 10 before October 2; 9 in 10 before October 30
NOAA puts the median frost-free season at 157 days, and the season without a hard freeze (28°F) at 181 days.
A hard freeze (28°F) comes after April 30 in half of springs and before October 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Stevenson Dam in zone 6a in ZIP code 15861, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 6a: the coldest night of a typical year reaches −5°F (29 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 USC00368469; 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.
How hot and how cold does it get at Stevenson Dam?
In a normal year in Stevenson Dam, 9 days a year reach 90°F, 151 nights fall to 32°F or colder and 153 days bring measurable precipitation.
- Days at 90°F or more
- 9a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 151a normal year
- Days that stay below freezing
- 36high of 32°F or less
- Days with 0.01 inch of precipitation
- 153a normal year
- Days with 1 inch of snow or more
- 13a normal year
The highest temperature in this station's record (since 1969) is 106°F, on July 23, 2011; the lowest is −22°F, on January 20, 1994.
The wettest calendar year on that record is 2018, with 57.91 in; the snowiest season is 1993–94, with 65.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00368469; records: ACIS (NOAA Regional Climate Centers), station USC00368469. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Stevenson Dam?
Over a year 67% of the sunlight that would reach the ground under clear skies gets through the clouds at Stevenson Dam, 3.6 kWh per square metre a day. August is the sunniest month (75%) and December the cloudiest (50%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 54% | 1.5 |
| February | 58% | 2.3 |
| March | 61% | 3.3 |
| April | 65% | 4.5 |
| May | 67% | 5.2 |
| June | 71% | 5.8 |
| July | 75% | 5.8 |
| August | 75% | 5.2 |
| September | 72% | 4.1 |
| October | 63% | 2.7 |
| November | 61% | 1.8 |
| December | 50% | 1.2 |
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 many heating and cooling degree days does Stevenson Dam record?
A normal year at Stevenson Dam brings 6,838 heating degree days, 27% more than the median U.S. place (5,373), and 410 cooling degree days, 55% 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 2,358 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,268 | 0 |
| February | 1,096 | 0 |
| March | 961 | 0 |
| April | 585 | 1 |
| May | 288 | 20 |
| June | 79 | 74 |
| July | 17 | 148 |
| August | 26 | 122 |
| September | 147 | 42 |
| October | 481 | 3 |
| November | 792 | 0 |
| December | 1,099 | 0 |
| Year (annual) | 6,838 | 410 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00368469. 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.
Have recent years at Stevenson Dam been warmer than normal?
2025 averaged 49.0°F, 1.7°F above the 1991-2020 normal of 47.3°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 50.4°F | +3.1°F | 50.03 | 22.0 |
| 2022 | 48.6°F | +1.3°F | 40.34 | 42.5 |
| 2023 | 50.5°F | +3.2°F | 45.58 | 18.5 |
| 2024 | 51.1°F | +3.8°F | 45.58 | 27.6 |
| 2025 | 49.0°F | +1.7°F | 37.20 | 21.7 |
Over 45 complete years from 1970 to 2025, the station's annual mean temperature rose at a fitted 4.3°F per century (+0.24°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00368469; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Stevenson Dam's climate compare?
Stevenson Dam is warmer than 20 of the 108 places with their own NOAA record in Pennsylvania, and wetter than 40. Across the 7,247 U.S. stations with normals, its annual mean of 47.3°F is warmer than 29%.
In the Köppen classification computed from these normals, Stevenson Dam 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 Stevenson Dam share this climate record?
2 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.
- Sinnamahoning, PA42 people · 7 mi SW
- Driftwood, PA36 people · 7 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 Stevenson Dam's climate
What is the coldest month at Stevenson Dam?
January, with a normal high of 33°F and a normal low of 16°F. The warmest is July (81°F by day, 57°F at night).
Does it snow at Stevenson Dam?
Yes: 39 inches in a normal year, falling on 22 days with 0.1 inch or more, the most in January (10.7 inches).
What is the rainiest month at Stevenson Dam?
July, with 4.46 in of precipitation in a normal year; the driest is February with 2.40 in.
What plant hardiness zone is Stevenson Dam in?
The USDA's 2023 map puts Stevenson Dam in zone 6a in ZIP code 15861, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −5°F (29 years, 1991-2020): zone 6a.
How late can frost come at Stevenson Dam?
In half of years the last 32°F night comes after May 10; in one year in ten it comes after May 27. Waiting until May 27 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- Alvin R Bush Dam, PA6 miles from this station, 49.0°F a year
- Emporium, PA13 miles from this station, 48.3°F a year
- Renovo, PA16 miles from this station, 49.6°F a year
- Coudersport, PA24 miles from this station, 45.1°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made