Port Allegany, Pennsylvania climate: Normal weather by month, frost dates and records
Port Allegany's normal year runs from 14°F January nights to 80°F July afternoons, with 42.6 inches of precipitation and 55 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.7°C, January lows of −10°C, July highs of 26°C, 1,082 mm of precipitation a year.
- NOAA stationPort Allegany
- Station IDUSC00367103
- Location41.82°N 78.29°W
- Elevation1,475 ft (450 m)
- Population2,054
On October 23, the normal high in Port Allegany is 56°F and the normal low 34°F, and the chance of measurable rain or snow is 49%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Port Allegany.
- Jan 31° 14°
- Feb 34° 15°
- Mar 43° 22°
- Apr 57° 31°
- May 68° 43°
- Jun 76° 52°
- Jul 80° 56°
- Aug 78° 55°
- Sep 71° 48°
- Oct 59° 37°
- Nov 47° 28°
- Dec 36° 21°
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 Port Allegany each month?
July is the warmest month, with normal highs of 80°F; January the coldest, with normal lows of 14°F. The most precipitation falls in July (4.53 in), the least in February (2.25 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 31°F | 14°F | 22.3°F | 3.05 | 14.1 | 16 | <1 | 29 | 9 h 30 min |
| February | 34°F | 15°F | 24.2°F | 2.25 | 12.1 | 13 | <1 | 27 | 10 h 30 min |
| March | 43°F | 22°F | 32.7°F | 2.98 | 9.4 | 14 | <1 | 26 | 11 h 50 min |
| April | 57°F | 31°F | 44.0°F | 3.53 | 1.7 | 14 | <1 | 17 | 13 h 20 min |
| May | 68°F | 43°F | 55.2°F | 3.83 | 0.0 | 14 | <1 | 5 | 14 h 30 min |
| June | 76°F | 52°F | 63.7°F | 4.24 | 0.0 | 14 | <1 | <1 | 15 h 10 min |
| July | 80°F | 56°F | 67.5°F | 4.53 | 0.0 | 13 | 1 | <1 | 15 h |
| August | 78°F | 55°F | 66.2°F | 4.10 | 0.0 | 12 | <1 | <1 | 13 h 50 min |
| September | 71°F | 48°F | 59.7°F | 3.69 | 0.0 | 12 | <1 | <1 | 12 h 30 min |
| October | 59°F | 37°F | 48.1°F | 3.88 | 0.6 | 15 | <1 | 10 | 11 h 10 min |
| November | 47°F | 28°F | 37.6°F | 3.27 | 3.9 | 14 | <1 | 22 | 9 h 50 min |
| December | 36°F | 21°F | 28.2°F | 3.24 | 13.3 | 16 | <1 | 28 | 9 h 10 min |
| Year (annual) | 57°F | 35°F | 45.8°F | 42.59 | 55.1 | 165 | 2 | 165 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | −1°C | −10°C | −5.4°C | 77 mm | 36 cm |
| February | 1°C | −10°C | −4.3°C | 57 mm | 31 cm |
| March | 6°C | −5°C | 0.4°C | 76 mm | 24 cm |
| April | 14°C | 0°C | 6.7°C | 90 mm | 4 cm |
| May | 20°C | 6°C | 12.9°C | 97 mm | 0 cm |
| June | 24°C | 11°C | 17.6°C | 108 mm | 0 cm |
| July | 26°C | 13°C | 19.7°C | 115 mm | 0 cm |
| August | 26°C | 13°C | 19.0°C | 104 mm | 0 cm |
| September | 22°C | 9°C | 15.4°C | 94 mm | 0 cm |
| October | 15°C | 3°C | 8.9°C | 99 mm | 2 cm |
| November | 8°C | −2°C | 3.1°C | 83 mm | 10 cm |
| December | 2°C | −6°C | −2.1°C | 82 mm | 34 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00367103; 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 Port Allegany?
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 USC00367103.
When is the last frost in Port Allegany?
In Port Allegany, the last spring frost (32°F) comes after May 15 in half of years and after May 29 in one year in ten; the first autumn frost comes before October 6 in half of years and before September 25 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 151 year in 10 after May 29; 9 in 10 after April 29
- First autumn frost, half of years before
- October 61 year in 10 before September 25; 9 in 10 before October 21
NOAA puts the median frost-free season at 144 days, and the season without a hard freeze (28°F) at 167 days.
A hard freeze (28°F) comes after May 2 in half of springs and before October 20 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Port Allegany in zone 5b in ZIP code 16743, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Port Allegany's NOAA station is in zone 5b: the coldest night of a typical year reaches −11°F (21 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 USC00367103; 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 in Port Allegany?
In a normal year in Port Allegany, 2 days a year reach 90°F, 165 nights fall to 32°F or colder and 165 days bring measurable precipitation.
- Days at 90°F or more
- 2a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 165a normal year
- Days that stay below freezing
- 52high of 32°F or less
- Days with 0.01 inch of precipitation
- 165a normal year
- Days with 1 inch of snow or more
- 21a normal year
The highest temperature in this station's record (since 1969) is 99°F, on July 23, 2011; the lowest is −26°F, on February 16, 2015.
The wettest calendar year on that record is 2011, with 53.04 in; the snowiest season is 1977–78, with 111.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00367103; records: ACIS (NOAA Regional Climate Centers), station USC00367103. Records use complete months only; a month missing more than three days is left out.
How sunny is Port Allegany?
Over a year 67% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Port Allegany, 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 much heating and cooling does Port Allegany need?
A normal year in Port Allegany brings 7,278 heating degree days, 35% more than the median U.S. place (5,373), and 302 cooling degree days, 67% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,109 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,324 | 0 |
| February | 1,144 | 0 |
| March | 1,001 | 0 |
| April | 632 | 0 |
| May | 318 | 16 |
| June | 99 | 59 |
| July | 35 | 112 |
| August | 47 | 84 |
| September | 189 | 30 |
| October | 527 | 2 |
| November | 822 | 0 |
| December | 1,141 | 0 |
| Year (annual) | 7,278 | 302 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00367103. 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 Port Allegany been warmer than normal lately?
2025 averaged 46.2°F, 0.4°F above the 1991-2020 normal of 45.8°F. 4 of the 4 complete years since 2022 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2022 | 46.2°F | +0.4°F | 41.34 | 54.0 |
| 2023 | 48.1°F | +2.4°F | 39.37 | 32.1 |
| 2024 | 48.7°F | +2.9°F | 44.60 | 41.2 |
| 2025 | 46.2°F | +0.4°F | 40.85 | 45.4 |
Source: observed years: ACIS, station USC00367103. A year counts only with all twelve months complete.
How does Port Allegany's climate compare?
Port Allegany is warmer than 6 of the other 107 places with their own NOAA record in Pennsylvania, and wetter than 37. Across the 7,247 U.S. stations with normals, its annual mean of 45.8°F is warmer than 23%.
In the Köppen classification computed from these normals, Port Allegany 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 Port Allegany share this climate record?
Portville has no NOAA station with 1991-2020 normals of its 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.
- Portville, NY883 people · 15 mi N
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 Port Allegany's climate
What is the coldest month in Port Allegany?
January, with a normal high of 31°F and a normal low of 14°F. The warmest is July (80°F by day, 56°F at night).
Does it snow in Port Allegany?
Yes: 55 inches in a normal year, falling on 38 days with 0.1 inch or more, the most in January (14.1 inches).
What is the rainiest month in Port Allegany?
July, with 4.53 in of precipitation in a normal year; the driest is February with 2.25 in.
What plant hardiness zone is Port Allegany in?
The USDA's 2023 map puts Port Allegany in zone 5b in ZIP code 16743, the nearest ZIP area. By the same method at Port Allegany's NOAA station, the coldest night of a typical year reaches −11°F (21 years, 1991-2020): zone 5b.
How late can frost come in Port Allegany?
In half of years the last 32°F night comes after May 15; in one year in ten it comes after May 29. Waiting until May 29 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- Coudersport, PA13 miles from this station, 45.1°F a year
- Clermont (1 mi NW), PA14 miles from this station, 44.2°F a year
- Oswayo, PA16 miles from this station, 44.1°F a year
- Bradford, PA18 miles from this station, 45.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made