Jamestown, Pennsylvania climate: Normal weather by month, frost dates and records
Jamestown's normal year runs from 16°F January nights to 81°F July afternoons, with 43.8 inches of precipitation and 62 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.1°C, January lows of −9°C, July highs of 27°C, 1,113 mm of precipitation a year.
- NOAA stationJamestown (2 mi NW)
- Station IDUSC00364325
- Location41.50°N 80.47°W
- Elevation1,040 ft (317 m)
- Population564
On October 23, the normal high in Jamestown is 59°F and the normal low 38°F, and the chance of measurable rain or snow is 45%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Jamestown.
- Jan 34° 16°
- Feb 36° 17°
- Mar 45° 24°
- Apr 59° 35°
- May 70° 46°
- Jun 78° 54°
- Jul 81° 59°
- Aug 80° 57°
- Sep 74° 51°
- Oct 62° 40°
- Nov 50° 31°
- Dec 39° 23°
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 Jamestown 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 June (4.90 in), the least in February (2.26 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 34°F | 16°F | 25.0°F | 3.16 | 18.6 | 17 | <1 | 28 | 9 h 30 min |
| February | 36°F | 17°F | 26.4°F | 2.26 | 13.3 | 13 | <1 | 26 | 10 h 40 min |
| March | 45°F | 24°F | 34.7°F | 3.00 | 9.5 | 13 | <1 | 25 | 11 h 50 min |
| April | 59°F | 35°F | 46.9°F | 3.93 | 1.6 | 14 | <1 | 14 | 13 h 20 min |
| May | 70°F | 46°F | 57.6°F | 3.92 | 0.0 | 14 | <1 | 2 | 14 h 30 min |
| June | 78°F | 54°F | 66.0°F | 4.90 | 0.0 | 13 | 1 | <1 | 15 h 10 min |
| July | 81°F | 59°F | 69.9°F | 4.63 | 0.0 | 13 | 2 | <1 | 14 h 50 min |
| August | 80°F | 57°F | 68.4°F | 3.77 | 0.0 | 11 | 1 | <1 | 13 h 50 min |
| September | 74°F | 51°F | 62.0°F | 4.24 | 0.0 | 11 | <1 | <1 | 12 h 30 min |
| October | 62°F | 40°F | 50.9°F | 3.55 | 0.1 | 14 | <1 | 6 | 11 h 10 min |
| November | 50°F | 31°F | 40.3°F | 3.22 | 5.0 | 14 | <1 | 18 | 9 h 50 min |
| December | 39°F | 23°F | 30.9°F | 3.22 | 13.4 | 16 | <1 | 27 | 9 h 10 min |
| Year (annual) | 59°F | 38°F | 48.3°F | 43.80 | 61.5 | 161 | 4 | 146 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 1°C | −9°C | −3.9°C | 80 mm | 47 cm |
| February | 2°C | −9°C | −3.1°C | 57 mm | 34 cm |
| March | 7°C | −4°C | 1.5°C | 76 mm | 24 cm |
| April | 15°C | 2°C | 8.3°C | 100 mm | 4 cm |
| May | 21°C | 8°C | 14.2°C | 100 mm | 0 cm |
| June | 25°C | 12°C | 18.9°C | 124 mm | 0 cm |
| July | 27°C | 15°C | 21.1°C | 118 mm | 0 cm |
| August | 27°C | 14°C | 20.2°C | 96 mm | 0 cm |
| September | 23°C | 10°C | 16.7°C | 108 mm | 0 cm |
| October | 17°C | 4°C | 10.5°C | 90 mm | 0 cm |
| November | 10°C | 0°C | 4.6°C | 82 mm | 13 cm |
| December | 4°C | −5°C | −0.6°C | 82 mm | 34 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00364325; 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 Jamestown?
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 USC00364325.
When is the last frost in Jamestown?
In Jamestown, the last spring frost (32°F) comes after May 4 in half of years and after May 22 in one year in ten; the first autumn frost comes before October 14 in half of years and before October 1 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 22; 9 in 10 after April 22
- First autumn frost, half of years before
- October 141 year in 10 before October 1; 9 in 10 before November 1
NOAA puts the median frost-free season at 161 days, and the season without a hard freeze (28°F) at 187 days.
A hard freeze (28°F) comes after April 25 in half of springs and before October 30 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Jamestown in zone 6a in ZIP code 16110, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Jamestown's NOAA station is in zone 6a: the coldest night of a typical year reaches −9°F (27 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 USC00364325; 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 Jamestown?
In a normal year in Jamestown, 4 days a year reach 90°F, 146 nights fall to 32°F or colder and 161 days bring measurable precipitation.
- Days at 90°F or more
- 4a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 146a normal year
- Days that stay below freezing
- 41high of 32°F or less
- Days with 0.01 inch of precipitation
- 161a normal year
- Days with 1 inch of snow or more
- 26a normal year
The highest temperature in this station's record (since 1932) is 102°F, on July 11, 1936; the lowest is −27°F, on January 19, 1994.
The wettest calendar year on that record is 2011, with 56.76 in; the snowiest season is 1976–77, with 117.8 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00364325; records: ACIS (NOAA Regional Climate Centers), station USC00364325. Records use complete months only; a month missing more than three days is left out.
How sunny is Jamestown?
Over a year 68% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Jamestown, 3.6 kWh per square metre a day. July is the sunniest month (77%) and December the cloudiest (47%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 51% | 1.4 |
| February | 57% | 2.3 |
| March | 60% | 3.3 |
| April | 65% | 4.5 |
| May | 69% | 5.3 |
| June | 74% | 5.9 |
| July | 77% | 5.9 |
| August | 77% | 5.2 |
| September | 74% | 4.2 |
| October | 64% | 2.7 |
| November | 61% | 1.8 |
| December | 47% | 1.1 |
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 Jamestown need?
A normal year in Jamestown brings 6,549 heating degree days, 22% more than the median U.S. place (5,373), and 481 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 2,538 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,238 | 0 |
| February | 1,081 | 0 |
| March | 938 | 0 |
| April | 546 | 3 |
| May | 258 | 27 |
| June | 69 | 97 |
| July | 16 | 167 |
| August | 26 | 132 |
| September | 138 | 49 |
| October | 441 | 6 |
| November | 741 | 0 |
| December | 1,057 | 0 |
| Year (annual) | 6,549 | 481 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00364325. 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 Jamestown been warmer than normal lately?
2025 averaged 48.4°F, 0.1°F above the 1991-2020 normal of 48.3°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 49.7°F | +1.4°F | 41.77 | – |
| 2022 | 47.8°F | −0.5°F | 39.72 | – |
| 2023 | 50.0°F | +1.7°F | 40.53 | – |
| 2024 | 51.1°F | +2.8°F | 37.21 | 28.2 |
| 2025 | 48.4°F | +0.1°F | 46.97 | 58.4 |
Over 73 complete years from 1937 to 2025, the station's annual mean temperature rose at a fitted 2.1°F per century (+0.12°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00364325; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Jamestown's climate compare?
Jamestown is warmer than 29 of the other 107 places with their own NOAA record in Pennsylvania, and wetter than 49. Across the 7,247 U.S. stations with normals, its annual mean of 48.3°F is warmer than 33%.
In the Köppen classification computed from these normals, Jamestown 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 Jamestown share this climate record?
8 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.
- Greenville, PA5,459 people · 8 mi SE
- Orwell, OH1,511 people · 20 mi W
- Kinsman Center, OH780 people · 7 mi SW
- Pymatuning South, PA378 people · 1 mi NW
- Hartstown, PA203 people · 6 mi NE
- Orangeville, OH170 people · 11 mi S
- Adamsville, PA95 people · 5 mi E
- Atlantic, PA52 people · 7 mi E
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 Jamestown's climate
What is the coldest month in Jamestown?
January, with a normal high of 34°F and a normal low of 16°F. The warmest is July (81°F by day, 59°F at night).
Does it snow in Jamestown?
Yes: 62 inches in a normal year, falling on 34 days with 0.1 inch or more, the most in January (18.6 inches).
What is the rainiest month in Jamestown?
June, with 4.90 in of precipitation in a normal year; the driest is February with 2.26 in.
What plant hardiness zone is Jamestown in?
The USDA's 2023 map puts Jamestown in zone 6a in ZIP code 16110, the nearest ZIP area. By the same method at Jamestown's NOAA station, the coldest night of a typical year reaches −9°F (27 years, 1991-2020): zone 6a.
How late can frost come in Jamestown?
In half of years the last 32°F night comes after May 4; in one year in ten it comes after May 22. Waiting until May 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- Linesville, PA11 miles from this station, 48.3°F a year
- Port Meadville Airport, PA16 miles from this station, 48.6°F a year
- Dorset, OH16 miles from this station, 47.8°F a year
- Youngstown, OH20 miles from this station, 49.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made