Lewisburg, Pennsylvania climate: Normal weather by month, frost dates and records
Lewisburg's normal year runs from 19°F January nights to 84°F July afternoons, with 43.9 inches of precipitation and 29 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.2°C, January lows of −7°C, July highs of 29°C, 1,115 mm of precipitation a year.
- NOAA stationLewisburg
- Station IDUSC00364976
- Location40.95°N 76.88°W
- Elevation500 ft (152 m)
- From the center1 miles
- Population5,253
On October 23, the normal high in Lewisburg is 60°F and the normal low 39°F, and the chance of measurable rain or snow is 36%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Lewisburg.
- Jan 35° 19°
- Feb 38° 20°
- Mar 48° 27°
- Apr 62° 37°
- May 72° 48°
- Jun 80° 57°
- Jul 84° 62°
- Aug 83° 60°
- Sep 75° 52°
- Oct 63° 41°
- Nov 51° 31°
- Dec 40° 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 Lewisburg each month?
July is the warmest month, with normal highs of 84°F; January the coldest, with normal lows of 19°F. The most precipitation falls in July (4.49 in), the least in February (2.41 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 35°F | 19°F | 27.1°F | 3.13 | 8.0 | 11 | <1 | 28 | 9 h 30 min |
| February | 38°F | 20°F | 29.1°F | 2.41 | 7.8 | 9 | <1 | 26 | 10 h 40 min |
| March | 48°F | 27°F | 37.6°F | 3.48 | 5.3 | 11 | <1 | 23 | 11 h 50 min |
| April | 62°F | 37°F | 49.4°F | 3.75 | 0.8 | 13 | <1 | 9 | 13 h 20 min |
| May | 72°F | 48°F | 59.9°F | 3.93 | 0.0 | 14 | 1 | 1 | 14 h 30 min |
| June | 80°F | 57°F | 68.6°F | 3.74 | 0.0 | 13 | 2 | <1 | 15 h 10 min |
| July | 84°F | 62°F | 72.9°F | 4.49 | 0.0 | 11 | 6 | <1 | 14 h 50 min |
| August | 83°F | 60°F | 71.1°F | 4.28 | 0.0 | 12 | 3 | <1 | 13 h 50 min |
| September | 75°F | 52°F | 63.8°F | 4.41 | 0.0 | 11 | 1 | <1 | 12 h 30 min |
| October | 63°F | 41°F | 52.1°F | 3.81 | 0.2 | 11 | <1 | 4 | 11 h 10 min |
| November | 51°F | 31°F | 40.9°F | 3.10 | 1.3 | 10 | <1 | 18 | 10 h |
| December | 40°F | 24°F | 31.9°F | 3.35 | 5.4 | 11 | <1 | 25 | 9 h 20 min |
| Year (annual) | 61°F | 40°F | 50.4°F | 43.88 | 28.8 | 137 | 13 | 133 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −7°C | −2.7°C | 80 mm | 20 cm |
| February | 4°C | −7°C | −1.6°C | 61 mm | 20 cm |
| March | 9°C | −3°C | 3.1°C | 88 mm | 13 cm |
| April | 17°C | 3°C | 9.7°C | 95 mm | 2 cm |
| May | 22°C | 9°C | 15.5°C | 100 mm | 0 cm |
| June | 27°C | 14°C | 20.3°C | 95 mm | 0 cm |
| July | 29°C | 16°C | 22.7°C | 114 mm | 0 cm |
| August | 28°C | 15°C | 21.7°C | 109 mm | 0 cm |
| September | 24°C | 11°C | 17.7°C | 112 mm | 0 cm |
| October | 17°C | 5°C | 11.2°C | 97 mm | 1 cm |
| November | 10°C | 0°C | 4.9°C | 79 mm | 3 cm |
| December | 4°C | −4°C | −0.1°C | 85 mm | 14 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00364976; 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 Lewisburg?
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 USC00364976.
When is the last frost in Lewisburg?
In Lewisburg, the last spring frost (32°F) comes after April 26 in half of years and after May 11 in one year in ten; the first autumn frost comes before October 20 in half of years and before October 5 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 261 year in 10 after May 11; 9 in 10 after April 13
- First autumn frost, half of years before
- October 201 year in 10 before October 5; 9 in 10 before November 1
NOAA puts the median frost-free season at 176 days, and the season without a hard freeze (28°F) at 200 days.
A hard freeze (28°F) comes after April 14 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Lewisburg in zone 6b in ZIP code 17850, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Lewisburg's NOAA station is in zone 7a: the coldest night of a typical year reaches 1°F (23 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 USC00364976; 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 Lewisburg?
In a normal year in Lewisburg, 13 days a year reach 90°F, 133 nights fall to 32°F or colder and 137 days bring measurable precipitation.
- Days at 90°F or more
- 13a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 133a normal year
- Days that stay below freezing
- 27high of 32°F or less
- Days with 0.01 inch of precipitation
- 137a normal year
- Days with 1 inch of snow or more
- 9a normal year
The highest temperature in this station's record (since 1996) is 100°F, on July 23, 2011; the lowest is −13°F, on January 18, 2009.
The wettest calendar year on that record is 2011, with 74.09 in; the snowiest season is 2003–04, with 50.9 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00364976; records: ACIS (NOAA Regional Climate Centers), station USC00364976. Records use complete months only; a month missing more than three days is left out.
How sunny is Lewisburg?
Over a year 71% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Lewisburg, 3.9 kWh per square metre a day. July is the sunniest month (79%) and December the cloudiest (60%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 63% | 1.8 |
| February | 66% | 2.7 |
| March | 66% | 3.6 |
| April | 69% | 4.8 |
| May | 69% | 5.3 |
| June | 75% | 6.0 |
| July | 79% | 6.0 |
| August | 76% | 5.2 |
| September | 74% | 4.2 |
| October | 68% | 2.9 |
| November | 69% | 2.1 |
| December | 60% | 1.5 |
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 Lewisburg need?
A normal year in Lewisburg brings 6,004 heating degree days, 12% more than the median U.S. place (5,373), and 703 cooling degree days, 23% 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 2,923 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,176 | 0 |
| February | 1,005 | 0 |
| March | 851 | 0 |
| April | 474 | 6 |
| May | 197 | 38 |
| June | 33 | 139 |
| July | 3 | 248 |
| August | 9 | 198 |
| September | 102 | 66 |
| October | 407 | 7 |
| November | 723 | 0 |
| December | 1,025 | 0 |
| Year (annual) | 6,004 | 703 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00364976. 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 Lewisburg been warmer than normal lately?
2025 averaged 50.5°F, 0.1°F above the 1991-2020 normal of 50.4°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 51.8°F | +1.4°F | 48.08 | 31.6 |
| 2022 | 50.4°F | at normal | 43.04 | 28.2 |
| 2023 | 52.0°F | +1.6°F | 49.69 | 7.7 |
| 2024 | 52.3°F | +1.9°F | 46.61 | 27.1 |
| 2025 | 50.5°F | +0.1°F | 36.76 | 13.3 |
Source: observed years: ACIS, station USC00364976. A year counts only with all twelve months complete.
How does Lewisburg's climate compare?
Lewisburg is warmer than 50 of the other 107 places with their own NOAA record in Pennsylvania, and wetter than 51. Across the 7,247 U.S. stations with normals, its annual mean of 50.4°F is warmer than 42%.
In the Köppen classification computed from these normals, Lewisburg 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 Lewisburg share this climate record?
12 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.
- Milton, PA6,483 people · 4 mi N
- Watsontown, PA2,206 people · 10 mi N
- Linntown, PA1,818 people · 1 mi NW
- New Columbia, PA914 people · 6 mi N
- Winfield, PA877 people · 4 mi S
- Montandon, PA823 people · 2 mi NE
- New Berlin, PA778 people · 7 mi SW
- West Milton, PA777 people · 5 mi N
- Turbotville, PA663 people · 12 mi NE
- McEwensville, PA286 people · 9 mi N
- Washingtonville, PA208 people · 13 mi NE
- Vicksburg, PA182 people · 6 mi W
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 Lewisburg's climate
What is the coldest month in Lewisburg?
January, with a normal high of 35°F and a normal low of 19°F. The warmest is July (84°F by day, 62°F at night).
Does it snow in Lewisburg?
Yes: 29 inches in a normal year, falling on 15 days with 0.1 inch or more, the most in January (8.0 inches).
What is the rainiest month in Lewisburg?
July, with 4.49 in of precipitation in a normal year; the driest is February with 2.41 in.
What plant hardiness zone is Lewisburg in?
The USDA's 2023 map puts Lewisburg in zone 6b in ZIP code 17850, the nearest ZIP area. By the same method at Lewisburg's NOAA station, the coldest night of a typical year reaches 1°F (23 years, 1991-2020): zone 7a.
How late can frost come in Lewisburg?
In half of years the last 32°F night comes after April 26; in one year in ten it comes after May 11. Waiting until May 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Pennsylvania climateThe statewide normals and every place in the state
- Sunbury, PA8 miles from this station, 50.3°F a year
- Selinsgrove, PA9 miles from this station, 51.1°F a year
- Laurelton, PA18 miles from this station, 51.8°F a year
- Williamsport, PA21 miles from this station, 51.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made