Grampian, Pennsylvania climate: Normal weather by month, frost dates and records
Grampian's normal year runs from 14°F January nights to 81°F July afternoons, with 48.3 inches of precipitation and 63 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 8.4°C, January lows of −10°C, July highs of 27°C, 1,228 mm of precipitation a year.
- NOAA stationGrampian (1 mi E)
- Station IDUSC00363417
- Location40.97°N 78.59°W
- Elevation1,510 ft (460 m)
- Population347
On October 23, the normal high in Grampian is 58°F and the normal low 35°F, and the chance of measurable rain or snow is 50%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Grampian.
- Jan 32° 14°
- Feb 36° 15°
- Mar 45° 23°
- Apr 59° 33°
- May 69° 45°
- Jun 77° 54°
- Jul 81° 58°
- Aug 79° 56°
- Sep 72° 49°
- Oct 61° 38°
- Nov 48° 28°
- Dec 37° 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 Grampian each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 14°F. The most precipitation falls in June (5.16 in), the least in February (3.45 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 32°F | 14°F | 23.2°F | 3.62 | 18.8 | 18 | <1 | 30 | 9 h 30 min |
| February | 36°F | 15°F | 25.7°F | 3.45 | 18.0 | 14 | <1 | 26 | 10 h 40 min |
| March | 45°F | 23°F | 34.1°F | 3.69 | 8.2 | 14 | <1 | 26 | 11 h 50 min |
| April | 59°F | 33°F | 46.1°F | 4.22 | 2.4 | 15 | <1 | 14 | 13 h 20 min |
| May | 69°F | 45°F | 56.9°F | 4.05 | 0.1 | 16 | <1 | 2 | 14 h 30 min |
| June | 77°F | 54°F | 65.1°F | 5.16 | 0.0 | 15 | <1 | <1 | 15 h 10 min |
| July | 81°F | 58°F | 69.3°F | 4.51 | 0.0 | 13 | 2 | <1 | 14 h 50 min |
| August | 79°F | 56°F | 67.5°F | 4.13 | 0.0 | 13 | <1 | <1 | 13 h 50 min |
| September | 72°F | 49°F | 60.7°F | 3.94 | 0.0 | 11 | <1 | <1 | 12 h 30 min |
| October | 61°F | 38°F | 49.1°F | 3.87 | 0.8 | 16 | <1 | 8 | 11 h 10 min |
| November | 48°F | 28°F | 38.3°F | 3.50 | 2.9 | 14 | <1 | 23 | 10 h |
| December | 37°F | 21°F | 28.9°F | 4.20 | 11.8 | 18 | <1 | 27 | 9 h 20 min |
| Year (annual) | 58°F | 36°F | 47.1°F | 48.34 | 63.0 | 176 | 3 | 156 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −10°C | −4.9°C | 92 mm | 48 cm |
| February | 2°C | −9°C | −3.5°C | 88 mm | 46 cm |
| March | 7°C | −5°C | 1.2°C | 94 mm | 21 cm |
| April | 15°C | 1°C | 7.8°C | 107 mm | 6 cm |
| May | 20°C | 7°C | 13.8°C | 103 mm | 0 cm |
| June | 25°C | 12°C | 18.4°C | 131 mm | 0 cm |
| July | 27°C | 14°C | 20.7°C | 115 mm | 0 cm |
| August | 26°C | 13°C | 19.7°C | 105 mm | 0 cm |
| September | 22°C | 9°C | 15.9°C | 100 mm | 0 cm |
| October | 16°C | 3°C | 9.5°C | 98 mm | 2 cm |
| November | 9°C | −2°C | 3.5°C | 89 mm | 7 cm |
| December | 3°C | −6°C | −1.7°C | 107 mm | 30 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00363417; 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 Grampian?
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 USC00363417.
When is the last frost in Grampian?
In Grampian, the last spring frost (32°F) comes after May 4 in half of years and after May 21 in one year in ten; the first autumn frost comes before October 13 in half of years and before September 30 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 41 year in 10 after May 21; 9 in 10 after April 20
- First autumn frost, half of years before
- October 131 year in 10 before September 30; 9 in 10 before October 28
NOAA puts the median frost-free season at 160 days, and the season without a hard freeze (28°F) at 184 days.
A hard freeze (28°F) comes after April 23 in half of springs and before October 27 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Grampian in zone 6a in ZIP code 16833, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Grampian's NOAA station is in zone 6a: the coldest night of a typical year reaches −9°F (16 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 USC00363417; 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 Grampian?
In a normal year in Grampian, 3 days a year reach 90°F, 156 nights fall to 32°F or colder and 176 days bring measurable precipitation.
- Days at 90°F or more
- 3a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 156a normal year
- Days that stay below freezing
- 43high of 32°F or less
- Days with 0.01 inch of precipitation
- 176a normal year
- Days with 1 inch of snow or more
- 22a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00363417.
How sunny is Grampian?
Over a year 68% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Grampian, 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 Grampian need?
A normal year in Grampian brings 6,899 heating degree days, 28% more than the median U.S. place (5,373), and 390 cooling degree days, 57% 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 2,345 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,297 | 0 |
| February | 1,102 | 0 |
| March | 958 | 0 |
| April | 568 | 1 |
| May | 268 | 17 |
| June | 64 | 67 |
| July | 19 | 152 |
| August | 35 | 111 |
| September | 170 | 39 |
| October | 497 | 3 |
| November | 803 | 0 |
| December | 1,119 | 0 |
| Year (annual) | 6,899 | 390 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00363417. 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 Grampian been warmer than normal lately?
2025 averaged 47.9°F, 0.8°F above the 1991-2020 normal of 47.1°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 49.2°F | +2.1°F | 58.08 | – |
| 2022 | 47.1°F | at normal | 57.35 | 60.4 |
| 2023 | 49.6°F | +2.5°F | 50.96 | 27.1 |
| 2024 | 50.2°F | +3.1°F | 60.78 | 57.9 |
| 2025 | 47.9°F | +0.8°F | 51.46 | 66.3 |
Source: observed years: ACIS, station USC00363417. A year counts only with all twelve months complete.
How does Grampian's climate compare?
Grampian is warmer than 16 of the other 107 places with their own NOAA record in Pennsylvania, and wetter than 87. Across the 7,247 U.S. stations with normals, its annual mean of 47.1°F is warmer than 28%.
In the Köppen classification computed from these normals, Grampian 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 Grampian share this climate record?
9 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.
- Curwensville, PA2,488 people · 4 mi E
- Luthersburg, PA328 people · 9 mi NW
- Mahaffey, PA313 people · 10 mi SW
- Glen Richey, PA257 people · 6 mi E
- Glen Campbell, PA253 people · 16 mi SW
- Troutville, PA226 people · 11 mi W
- Burnside, PA185 people · 15 mi SW
- Newburg, PA82 people · 10 mi SW
- New Washington, PA52 people · 12 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 Grampian's climate
What is the coldest month in Grampian?
January, with a normal high of 32°F and a normal low of 14°F. The warmest is July (81°F by day, 58°F at night).
Does it snow in Grampian?
Yes: 63 inches in a normal year, falling on 41 days with 0.1 inch or more, the most in January (18.8 inches).
What is the rainiest month in Grampian?
June, with 5.16 in of precipitation in a normal year; the driest is February with 3.45 in.
What plant hardiness zone is Grampian in?
The USDA's 2023 map puts Grampian in zone 6a in ZIP code 16833, the nearest ZIP area. By the same method at Grampian's NOAA station, the coldest night of a typical year reaches −9°F (16 years, 1991-2020): zone 6a.
How late can frost come in Grampian?
In half of years the last 32°F night comes after May 4; in one year in ten it comes after May 21. Waiting until May 21 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- Clearfield, PA11 miles from this station, 48.7°F a year
- Philipsburg, PA21 miles from this station, 46.6°F a year
- DuBois, PA22 miles from this station, 47.7°F a year
- Prince Gallitzin State Park, PA22 miles from this station, 48.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made