Williamsport, PA Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from Williamsport's primary NOAA station, WILLIAMSPORT - 2 stations mapped to the area.
The climate verdict for Williamsport
Williamsport, Pennsylvania has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 51°F. Its climate comfort score of 63/100 (good) lands mid-pack nationally, exceeding 46% of station-mapped location scores.
- 51°F
- average temperature, NOAA 1991-2020 normal
- 63/100
- comfort score, above 46% of station-mapped location scores
- 43.5"
- annual precipitation · 36" snow
- 182 days
- growing season, frost-free days
Williamsport: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00014778 · Williamsport, PA 51°F mean · 43.5" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-MULTI · BOOK-FULL
- TEMP-COOL 51°F
- RANK-MID #3,156
- PHOTO-FINISH ≈ Fillmore
- PRCP-MID 43.5"
- SWING-WIDE 46°F
- COMF-MID 63/100
- LOAD-HEAT 5,774 HDD
- STN-MULTI USW00014778
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Fillmore, UT (+ 0.1 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every PA station list.
- Williamsport (this station) 51°F
- Hot Cedar City, UT 51°F
- Near Fillmore, UT 51°F
- Near Denver-stapleton, CO 51°F
- Near Wilkes-barre, PA 51°F
Climate Living Index · Williamsport
Williamsport: 54/100 · grade D
Williamsport publishes all six Living Index dimensions from NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals.
PlainClimate-derived for Williamsport, not an official NOAA rating. Rankings still use Comfort Score 63/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Precipitation balance | 43.5 in · 8.5 from 35 in | 70/100 · B |
| Normal heat + freeze calendar | 128 calendar days | 60/100 · C |
| Summer moisture balance | 60.9°F mean dew point | 57/100 · C |
| Frost-free season | 182 days/year | 51/100 · D |
| Annual temperature balance | 51.2°F · 16.3° from 67.5°F | 46/100 · D |
| Snowfall burden | 35.8 inches/year | 32/100 · F |
Williamsport · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Williamsport is a continental Köppen climate: Dfa
Coldest-month mean 27.7°F and warmest-month mean 73.7°F place this station in continental, no dry season, hot summer climates (Dfa). Class Dfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: continental, specifically continental, no dry season, hot summer.
- Köppen code
- Dfa
- Group
- Continental
- Warmest month
- 73.7°F
- Coldest month
- 27.7°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · heating-led station
Where Williamsport sits across the climate record
Three NOAA fields for Williamsport's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 46th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- 65th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- 64th percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Williamsport compares across U.S. station-mapped locations
Williamsport's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
63 46th percentile score exceeds 46% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). This entry sits in this band.
- 70–80: 650 station-mapped locations (11%). Above this entry.
- 80–90: 921 station-mapped locations (15%). Above this entry.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Williamsport's measured station temperature trend
MethodologyAcross 120 complete annual observations from 1874 to 2025, WILLIAMSPORT warmed at a fitted rate of 0.14°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Williamsport primary station fitted change +0.14 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 35°F (2°C) | 20°F (-7°C) | 28°F (-2°C) | 3.0" | 9.7" | 27.3 | 0.0 |
| February | 39°F (4°C) | 22°F (-6°C) | 30°F (-1°C) | 2.3" | 9.3" | 24.6 | 0.0 |
| March | 48°F (9°C) | 29°F (-2°C) | 39°F (4°C) | 3.1" | 7.3" | 20.5 | 0.0 |
| April | 62°F (17°C) | 39°F (4°C) | 50°F (10°C) | 3.6" | 0.8" | 6.8 | 0.2 |
| May | 72°F (22°C) | 49°F (10°C) | 61°F (16°C) | 3.9" | 0.0" | 0.6 | 1.5 |
| June | 81°F (27°C) | 58°F (15°C) | 69°F (21°C) | 3.9" | 0.0" | 0.0 | 3.0 |
| July | 85°F (29°C) | 63°F (17°C) | 74°F (23°C) | 4.6" | 0.0" | 0.0 | 7.3 |
| August | 83°F (28°C) | 61°F (16°C) | 72°F (22°C) | 4.2" | 0.0" | 0.0 | 4.0 |
| September | 75°F (24°C) | 54°F (12°C) | 65°F (18°C) | 4.8" | 0.0" | 0.0 | 1.3 |
| October | 63°F (17°C) | 43°F (6°C) | 53°F (12°C) | 3.7" | 0.1" | 2.9 | 0.0 |
| November | 51°F (10°C) | 33°F (1°C) | 42°F (5°C) | 3.3" | 1.7" | 15.0 | 0.0 |
| December | 40°F (4°C) | 26°F (-3°C) | 33°F (0°C) | 3.3" | 6.9" | 24.1 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 85°F around July 12, short of 90°F on every date, while 128 dates carry a normal low at or below freezing, the coldest 19°F near January 23.
The freezing stretch
The normal low stays at or below 32°F into March 26, then returns to freezing around November 20, covering 128 dates in all.
Derived from the normal daily minimum. This is a different measure from the 50%-probability frost dates shown elsewhere on this page, which come from NOAA’s frost product.
Where the wet dates fall
The likeliest wet date is May 12, when 44% of years recorded at least a hundredth of an inch. The driest is September 1 at 32%. Summed across the calendar, that is about 137 wet dates a year.
The widest day
April 30 carries the biggest normal gap between afternoon and dawn, 24°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Williamsport.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 9.7"
12.1 days with precipitation
Snow: 9.3"
10.1 days with precipitation
Snow: 7.3"
11.6 days with precipitation
Snow: 0.8"
12.2 days with precipitation
13.7 days with precipitation
11.8 days with precipitation
11.9 days with precipitation
10.5 days with precipitation
10.0 days with precipitation
Snow: 0.1"
10.7 days with precipitation
Snow: 1.7"
10.0 days with precipitation
Snow: 6.9"
11.9 days with precipitation
Williamsport spreads its precipitation across the year
Neither half of the year dominates here: June through August take 29% of the annual total and December through February 20%, with neither reaching the 35% that would mark a distinct wet season. Williamsport has no dry season to plan around, though it does carry a wide 46°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: September averages 4.8" and February 2.3". The three wettest months together take 31% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
How Williamsport's precipitation splits across the calendar
About 137 days a year record measurable precipitation here, carrying 43.5" between them, or roughly 0.32 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Winter brings real snow to Williamsport
Williamsport averages 35.8 inches of snowfall a year, with January the snowiest month on the normals, spread across roughly 24 days that record measurable snow. That is depth accumulating on the ground, which is why it can exceed the annual precipitation figure: precipitation counts the liquid the snow melts down to, and fresh snow is mostly air.
- Annual snowfall: 35.8 inches of depth.
- Days recording measurable snow: about 24 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 8% of the year's precipitation.
NOAA 1991-2020 normals. The ten-to-one ratio is a convention, not a measurement: real ratios vary with temperature, so treat the share as an order of magnitude rather than an exact split.
Frost Dates & Growing Season
First Fall Freeze
October 23
50% probability date
Last Spring Freeze
April 24
50% probability date
Growing Season
182 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,774
Higher = more heating needed
Cooling Degree Days
796
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Humidity & Wind
Monthly averages from hourly observations
| Month | Humidity | Wind (mph) | Clear Sky % | Overcast % |
|---|---|---|---|---|
| January | 65% | 7.1 | 34% | 45% |
| February | 62% | 7.8 | 34% | 45% |
| March | 58% | 7.6 | 40% | 40% |
| April | 59% | 6.8 | 42% | 30% |
| May | 68% | 5.7 | 39% | 26% |
| June | 69% | 5.2 | 43% | 16% |
| July | 71% | 4.7 | 39% | 21% |
| August | 74% | 4.4 | 44% | 24% |
| September | 76% | 5.0 | 43% | 29% |
| October | 69% | 6.1 | 42% | 37% |
| November | 70% | 6.9 | 32% | 47% |
| December | 69% | 7.0 | 30% | 50% |
Nationwide similar cities
Other rankable U.S. places outside PA closest to Williamsport on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (51°F here).
- Bellingham, WA 51°F · 0.0°F off
- Bloomfield, IA 51°F · 0.0°F off
- Burlington, IA 51°F · 0.0°F off
- Chicago, IL 51°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (43.5" here), excluding temperature-peer places.
- Mexico, MO 43.5" · 0.0" off
- Fittstown, OK 43.5" · 0.0" off
- Okemah, OK 43.5" · 0.0" off
- Westfield, NY 43.5" · 0.0" off
Snow and freeze rhythm
When cold and snow define Williamsport
heating led · moderate · mid swing
Williamsport's energy balance leans toward cold weather: 5,774 annual heating degree days against 796 for cooling. Its 46.0°F seasonal range still makes the monthly rows more useful than the annual average alone.
Williamsport's frost-free season lasts about 182 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Williamsport coldest normal
January
The monthly mean of 28°F (-2°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Williamsport typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Williamsport snow peak
January
Williamsport averages 35.8 inches of snow a year, with January the snowiest month on the normals.
Questions about Williamsport's climate
How much snow does Williamsport get? ▼
How cold does Williamsport get in winter? ▼
How much energy does heating and cooling require in Williamsport? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Williamsport's primary station: WILLIAMSPORT (USW00014778). 2 NOAA stations are mapped to the Williamsport area; the primary station's record is used for consistency. For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 4285312). Match rule for Williamsport: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Williamsport comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.