Lewistown, Pennsylvania climate: Normal weather by month, frost dates and records
Lewistown's normal year runs from 21°F January nights to 85°F July afternoons, with 42.1 inches of precipitation and 26 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.1°C, January lows of −6°C, July highs of 30°C, 1,070 mm of precipitation a year.
- NOAA stationLewistown
- Station IDUSC00364992
- Location40.59°N 77.57°W
- Elevation460 ft (140 m)
- From the centerunder 1 mile
- Population8,394
On October 23, the normal high in Lewistown is 62°F and the normal low 40°F, and the chance of measurable rain or snow is 35%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Lewistown.
- Jan 37° 21°
- Feb 40° 22°
- Mar 49° 29°
- Apr 63° 39°
- May 73° 49°
- Jun 81° 58°
- Jul 85° 63°
- Aug 84° 61°
- Sep 77° 54°
- Oct 65° 43°
- Nov 53° 33°
- Dec 41° 26°
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 Lewistown each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 21°F. The most precipitation falls in September (4.40 in), the least in February (2.31 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 37°F | 21°F | 29.0°F | 2.89 | 9.1 | 11 | <1 | 27 | 9 h 30 min |
| February | 40°F | 22°F | 31.4°F | 2.31 | 6.9 | 10 | <1 | 24 | 10 h 40 min |
| March | 49°F | 29°F | 39.3°F | 3.57 | 4.3 | 11 | <1 | 21 | 11 h 50 min |
| April | 63°F | 39°F | 50.8°F | 3.53 | 0.2 | 13 | <1 | 6 | 13 h 10 min |
| May | 73°F | 49°F | 60.9°F | 4.16 | 0.0 | 14 | 1 | <1 | 14 h 20 min |
| June | 81°F | 58°F | 69.5°F | 3.95 | 0.0 | 12 | 3 | <1 | 15 h |
| July | 85°F | 63°F | 74.0°F | 3.64 | 0.0 | 11 | 8 | <1 | 14 h 50 min |
| August | 84°F | 61°F | 72.4°F | 3.61 | 0.0 | 11 | 4 | <1 | 13 h 50 min |
| September | 77°F | 54°F | 65.3°F | 4.40 | 0.0 | 10 | 2 | <1 | 12 h 30 min |
| October | 65°F | 43°F | 53.7°F | 3.75 | 0.1 | 11 | <1 | 3 | 11 h 10 min |
| November | 53°F | 33°F | 42.8°F | 3.06 | 0.9 | 10 | <1 | 15 | 10 h |
| December | 41°F | 26°F | 33.9°F | 3.27 | 4.7 | 11 | <1 | 24 | 9 h 20 min |
| Year (annual) | 62°F | 42°F | 51.9°F | 42.14 | 26.2 | 135 | 18 | 122 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 3°C | −6°C | −1.7°C | 73 mm | 23 cm |
| February | 5°C | −5°C | −0.3°C | 59 mm | 18 cm |
| March | 10°C | −2°C | 4.1°C | 91 mm | 11 cm |
| April | 17°C | 4°C | 10.4°C | 90 mm | 1 cm |
| May | 23°C | 10°C | 16.1°C | 106 mm | 0 cm |
| June | 27°C | 15°C | 20.8°C | 100 mm | 0 cm |
| July | 30°C | 17°C | 23.3°C | 92 mm | 0 cm |
| August | 29°C | 16°C | 22.4°C | 92 mm | 0 cm |
| September | 25°C | 12°C | 18.5°C | 112 mm | 0 cm |
| October | 18°C | 6°C | 12.1°C | 95 mm | 0 cm |
| November | 11°C | 1°C | 6.0°C | 78 mm | 2 cm |
| December | 5°C | −3°C | 1.1°C | 83 mm | 12 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00364992; 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 Lewistown?
Normal highs sit between 65°F and 85°F in May, June, August, September and October. Of those, September has the fewest days with rain (10).
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 USC00364992.
When is the last frost in Lewistown?
In Lewistown, the last spring frost (32°F) comes after April 21 in half of years and after May 9 in one year in ten; the first autumn frost comes before October 24 in half of years and before October 7 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
- April 211 year in 10 after May 9; 9 in 10 after April 6
- First autumn frost, half of years before
- October 241 year in 10 before October 7; 9 in 10 before November 7
NOAA puts the median frost-free season at 185 days, and the season without a hard freeze (28°F) at 211 days.
A hard freeze (28°F) comes after April 6 in half of springs and before November 5 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Lewistown in zone 7a in ZIP code 17044, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Lewistown's NOAA station is in zone 7a: the coldest night of a typical year reaches 3°F (30 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 USC00364992; 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 Lewistown?
In a normal year in Lewistown, 18 days a year reach 90°F, 122 nights fall to 32°F or colder and 135 days bring measurable precipitation.
- Days at 90°F or more
- 18a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 122a normal year
- Days that stay below freezing
- 24high of 32°F or less
- Days with 0.01 inch of precipitation
- 135a normal year
- Days with 1 inch of snow or more
- 9a normal year
The highest temperature in this station's record (since 1938) is 106°F, on July 23, 2011; the lowest is −17°F, on January 20, 1994.
The wettest calendar year on that record is 2018, with 61.63 in; the snowiest season is 1993–94, with 81.2 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00364992; records: ACIS (NOAA Regional Climate Centers), station USC00364992. Records use complete months only; a month missing more than three days is left out.
How sunny is Lewistown?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Lewistown, 3.8 kWh per square metre a day. July is the sunniest month (77%) and December the cloudiest (58%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 60% | 1.8 |
| February | 65% | 2.6 |
| March | 64% | 3.6 |
| April | 67% | 4.7 |
| May | 68% | 5.3 |
| June | 74% | 5.9 |
| July | 77% | 5.9 |
| August | 76% | 5.2 |
| September | 73% | 4.2 |
| October | 67% | 2.9 |
| November | 67% | 2.1 |
| December | 58% | 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 Lewistown need?
A normal year in Lewistown brings 5,570 heating degree days, 4% more than the median U.S. place (5,373), and 832 cooling degree days, 8% 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 3,165 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,116 | 0 |
| February | 942 | 0 |
| March | 797 | 0 |
| April | 433 | 7 |
| May | 175 | 49 |
| June | 28 | 163 |
| July | 2 | 279 |
| August | 5 | 233 |
| September | 81 | 90 |
| October | 360 | 12 |
| November | 666 | 0 |
| December | 966 | 0 |
| Year (annual) | 5,570 | 832 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00364992. 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 Lewistown been warmer than normal lately?
2025 averaged 51.8°F, 0.1°F below the 1991-2020 normal of 51.9°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 53.3°F | +1.4°F | 47.99 | – |
| 2022 | 52.1°F | +0.2°F | 46.05 | 34.4 |
| 2023 | 53.8°F | +1.9°F | 41.25 | 6.9 |
| 2024 | 54.1°F | +2.3°F | 48.04 | 19.9 |
| 2025 | 51.8°F | −0.1°F | 39.68 | 13.4 |
Over 66 complete years from 1940 to 2025, the station's annual mean temperature rose at a fitted 2.8°F per century (+0.15°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00364992; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Lewistown's climate compare?
Lewistown is warmer than 73 of the other 107 places with their own NOAA record in Pennsylvania, and wetter than 30. Across the 7,247 U.S. stations with normals, its annual mean of 51.9°F is warmer than 49%.
In the Köppen classification computed from these normals, Lewistown is Dfa: continental, no dry season, hot 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 Lewistown share this climate record?
29 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.
- Burnham, PA1,966 people · 3 mi N
- Belleville, PA1,860 people · 8 mi W
- Church Hill, PA1,798 people · 7 mi N
- Highland Park, PA1,417 people · 2 mi N
- Milroy, PA1,393 people · 9 mi N
- Yeagertown, PA1,041 people · 4 mi N
- Strodes Mills, PA844 people · 6 mi SW
- McAlisterville, PA830 people · 16 mi E
- Mifflintown, PA824 people · 9 mi E
- Port Royal, PA796 people · 10 mi E
- Millerstown, PA705 people · 22 mi E
- Thompsontown, PA635 people · 18 mi E
- Juniata Terrace, PA553 people · 0 mi W
- Mifflin, PA520 people · 9 mi E
- Reedsville, PA467 people · 6 mi N
- Allensville, PA413 people · 13 mi W
- Mexico, PA411 people · 11 mi E
- Maitland, PA365 people · 4 mi NE
- Mattawana, PA357 people · 10 mi SW
- McVeytown, PA335 people · 11 mi SW
- Barrville, PA284 people · 8 mi NW
- Granville, PA267 people · 3 mi SW
- Lumber City, PA230 people · 5 mi N
- Siglerville, PA191 people · 11 mi N
- Potlicker Flats, PA131 people · 10 mi N
- East Salem, PA123 people · 18 mi E
- Alfarata, PA120 people · 8 mi NE
- Longfellow, PA115 people · 7 mi SW
- Wagner, PA45 people · 12 mi NE
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 Lewistown's climate
What is the coldest month in Lewistown?
January, with a normal high of 37°F and a normal low of 21°F. The warmest is July (85°F by day, 63°F at night).
Does it snow in Lewistown?
Yes: 26 inches in a normal year, falling on 12 days with 0.1 inch or more, the most in January (9.1 inches).
What is the rainiest month in Lewistown?
September, with 4.40 in of precipitation in a normal year; the driest is February with 2.31 in.
What plant hardiness zone is Lewistown in?
The USDA's 2023 map puts Lewistown in zone 7a in ZIP code 17044, the nearest ZIP area. By the same method at Lewistown's NOAA station, the coldest night of a typical year reaches 3°F (30 years, 1991-2020): zone 7a.
How late can frost come in Lewistown?
In half of years the last 32°F night comes after April 21; in one year in ten it comes after May 9. Waiting until May 9 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- State College, PA21 miles from this station, 50.1°F a year
- Millheim, PA21 miles from this station, 48.1°F a year
- Bloserville (1 mi N), PA25 miles from this station, 51.8°F a year
- Laurelton, PA29 miles from this station, 51.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made