Warren, Pennsylvania climate: Normal weather by month, frost dates and records
Warren's normal year runs from 18°F January nights to 81°F July afternoons, with 47.0 inches of precipitation and 72 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.0°C, January lows of −8°C, July highs of 27°C, 1,193 mm of precipitation a year.
- NOAA stationWarren
- Station IDUSC00369298
- Location41.85°N 79.15°W
- Elevation1,210 ft (369 m)
- From the centerunder 1 mile
- Population9,125
On October 23, the normal high in Warren is 58°F and the normal low 39°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 Warren.
- Jan 33° 18°
- Feb 35° 18°
- Mar 44° 24°
- Apr 58° 34°
- May 70° 45°
- Jun 77° 55°
- Jul 81° 59°
- Aug 80° 58°
- Sep 74° 52°
- Oct 61° 41°
- Nov 48° 32°
- Dec 37° 24°
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 Warren each month?
July is the warmest month, with normal highs of 81°F; January the coldest, with normal lows of 18°F. The most precipitation falls in July (4.76 in), the least in February (2.77 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 33°F | 18°F | 25.2°F | 3.64 | 18.2 | 19 | <1 | 28 | 9 h 30 min |
| February | 35°F | 18°F | 26.5°F | 2.77 | 14.9 | 15 | <1 | 26 | 10 h 30 min |
| March | 44°F | 24°F | 34.2°F | 3.26 | 10.0 | 15 | <1 | 25 | 11 h 50 min |
| April | 58°F | 34°F | 46.4°F | 4.13 | 2.4 | 15 | <1 | 14 | 13 h 20 min |
| May | 70°F | 45°F | 57.5°F | 4.29 | 0.0 | 14 | <1 | 2 | 14 h 30 min |
| June | 77°F | 55°F | 66.0°F | 4.66 | 0.0 | 14 | 1 | <1 | 15 h 10 min |
| July | 81°F | 59°F | 70.0°F | 4.76 | 0.0 | 13 | 3 | <1 | 15 h |
| August | 80°F | 58°F | 69.0°F | 4.07 | 0.0 | 12 | 2 | <1 | 14 h |
| September | 74°F | 52°F | 62.7°F | 3.95 | 0.0 | 12 | 1 | <1 | 12 h 30 min |
| October | 61°F | 41°F | 50.9°F | 4.02 | 0.1 | 15 | <1 | 4 | 11 h 10 min |
| November | 48°F | 32°F | 39.9°F | 3.62 | 7.5 | 15 | <1 | 17 | 9 h 50 min |
| December | 37°F | 24°F | 30.7°F | 3.81 | 18.5 | 18 | <1 | 26 | 9 h 10 min |
| Year (annual) | 58°F | 38°F | 48.2°F | 46.98 | 71.6 | 175 | 7 | 141 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 0°C | −8°C | −3.8°C | 92 mm | 46 cm |
| February | 2°C | −8°C | −3.1°C | 70 mm | 38 cm |
| March | 7°C | −4°C | 1.2°C | 83 mm | 25 cm |
| April | 15°C | 1°C | 8.0°C | 105 mm | 6 cm |
| May | 21°C | 7°C | 14.2°C | 109 mm | 0 cm |
| June | 25°C | 13°C | 18.9°C | 118 mm | 0 cm |
| July | 27°C | 15°C | 21.1°C | 121 mm | 0 cm |
| August | 27°C | 14°C | 20.6°C | 103 mm | 0 cm |
| September | 23°C | 11°C | 17.1°C | 100 mm | 0 cm |
| October | 16°C | 5°C | 10.5°C | 102 mm | 0 cm |
| November | 9°C | 0°C | 4.4°C | 92 mm | 19 cm |
| December | 3°C | −4°C | −0.7°C | 97 mm | 47 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00369298; 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 Warren?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August 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 USC00369298.
When is the last frost in Warren?
In Warren, 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 21 in half of years and before October 6 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 20
- First autumn frost, half of years before
- October 211 year in 10 before October 6; 9 in 10 before November 4
NOAA puts the median frost-free season at 168 days, and the season without a hard freeze (28°F) at 192 days.
A hard freeze (28°F) comes after April 23 in half of springs and before November 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Warren in zone 6a in ZIP code 16365, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Warren's NOAA station is in zone 6b: the coldest night of a typical year reaches −4°F (30 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Pennsylvania · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00369298; 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 Warren?
In a normal year in Warren, 7 days a year reach 90°F, 141 nights fall to 32°F or colder and 175 days bring measurable precipitation.
- Days at 90°F or more
- 7a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 141a normal year
- Days that stay below freezing
- 47high of 32°F or less
- Days with 0.01 inch of precipitation
- 175a normal year
- Days with 1 inch of snow or more
- 28a normal year
The highest temperature in this station's record (since 1896) is 102°F, on July 23, 2011; the lowest is −34°F, on February 11, 1979.
The wettest calendar year on that record is 2006, with 60.14 in; the snowiest season is 1977–78, with 128.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00369298; records: ACIS (NOAA Regional Climate Centers), station USC00369298. Records use complete months only; a month missing more than three days is left out.
How sunny is Warren?
Over a year 67% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Warren, 3.6 kWh per square metre a day. August is the sunniest month (76%) and December the cloudiest (47%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 52% | 1.5 |
| February | 56% | 2.2 |
| March | 59% | 3.3 |
| April | 65% | 4.5 |
| May | 68% | 5.3 |
| June | 73% | 5.9 |
| July | 76% | 5.9 |
| August | 76% | 5.2 |
| September | 73% | 4.2 |
| October | 63% | 2.7 |
| November | 60% | 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 Warren need?
A normal year in Warren brings 6,581 heating degree days, 22% more than the median U.S. place (5,373), and 513 cooling degree days, 44% 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 2,568 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,234 | 0 |
| February | 1,079 | 0 |
| March | 953 | 0 |
| April | 563 | 3 |
| May | 265 | 32 |
| June | 69 | 97 |
| July | 16 | 171 |
| August | 21 | 146 |
| September | 124 | 57 |
| October | 444 | 6 |
| November | 752 | 0 |
| December | 1,062 | 0 |
| Year (annual) | 6,581 | 513 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00369298. 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 Warren been warmer than normal lately?
2025 averaged 47.8°F, 0.4°F below the 1991-2020 normal of 48.2°F. 3 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 50.2°F | +2.0°F | 49.75 | 45.3 |
| 2022 | 48.0°F | −0.2°F | 47.89 | 69.0 |
| 2023 | 50.0°F | +1.8°F | 33.97 | – |
| 2024 | 50.6°F | +2.4°F | 48.28 | – |
| 2025 | 47.8°F | −0.4°F | 42.90 | 82.2 |
Over 104 complete years from 1899 to 2025, the station's annual mean temperature rose at a fitted 2.2°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 USC00369298; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Warren's climate compare?
Warren is warmer than 28 of the other 107 places with their own NOAA record in Pennsylvania, and wetter than 77. Across the 7,247 U.S. stations with normals, its annual mean of 48.2°F is warmer than 33%.
In the Köppen classification computed from these normals, Warren 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 Warren share this climate record?
3 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.
- North Warren, PA2,074 people · 3 mi N
- Starbrick, PA579 people · 3 mi W
- Clarendon, PA395 people · 5 mi SE
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 Warren's climate
What is the coldest month in Warren?
January, with a normal high of 33°F and a normal low of 18°F. The warmest is July (81°F by day, 59°F at night).
Does it snow in Warren?
Yes: 72 inches in a normal year, falling on 38 days with 0.1 inch or more, the most in December (18.5 inches).
What is the rainiest month in Warren?
July, with 4.76 in of precipitation in a normal year; the driest is February with 2.77 in.
What plant hardiness zone is Warren in?
The USDA's 2023 map puts Warren in zone 6a in ZIP code 16365, the nearest ZIP area. By the same method at Warren's NOAA station, the coldest night of a typical year reaches −4°F (30 years, 1991-2020): zone 6b.
How late can frost come in Warren?
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
- Chandlers Valley (1 mi SE), PA9 miles from this station, 45.1°F a year
- Jamestown, NY18 miles from this station, 47.3°F a year
- Kane, PA21 miles from this station, 44.6°F a year
- Bradford, PA26 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