Allentown, PA Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Allentown's primary NOAA station, ALLENTOWN INTL AP.
The climate verdict for Allentown
Water is the standout signal in Allentown, Pennsylvania: 47.4 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 53°F. Its climate comfort score of 63/100 (good) lands mid-pack nationally, exceeding 46% of station-mapped location scores.
- 53°F
- annual average temperature (NOAA normal)
- 63/100
- comfort score, above 46% of station-mapped location scores
- 47.4"
- annual precipitation · 33" snow
- 187 days
- growing season, frost-free days
Allentown: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00014737 · Allentown, PA 53°F mean · 47.4" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-MID · SWING-WIDE · COMF-MID · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 53°F
- RANK-MID #3,705
- PHOTO-FINISH ≈ Seymour
- PRCP-MID 47.4"
- SWING-WIDE 46°F
- COMF-MID 63/100
- LOAD-HEAT 5,293 HDD
- STN-1 USW00014737
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Seymour, IN (+ 0 °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.
- Allentown (this station) 53°F
- Hot Lambertville, NJ 53°F
- Near Seymour, IN 53°F
- Near Little Falls, NJ 53°F
- Near Philadelphia/mt…, NJ 53°F
Climate Living Index · Allentown
Allentown: 55/100 · grade C
Allentown publishes all six Living Index dimensions from NOAA annual/seasonal normals · NOAA daily multivariate normals · NOAA hourly normals.
PlainClimate-derived for Allentown, not an official NOAA rating. Rankings still use Comfort Score 63/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 120 calendar days | 65/100 · C |
| Precipitation balance | 47.4 in · 12.4 from 35 in | 57/100 · C |
| Frost-free season | 187 days/year | 55/100 · C |
| Annual temperature balance | 53.1°F · 14.4° from 67.5°F | 53/100 · D |
| Summer moisture balance | 61.8°F mean dew point | 50/100 · D |
| Snowfall burden | 33.1 inches/year | 35/100 · F |
Allentown · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Allentown is a continental Köppen climate: Dfa
Coldest-month mean 30.1°F and warmest-month mean 75.6°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
- 75.6°F
- Coldest month
- 30.1°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 Allentown sits across the climate record
Three NOAA fields for Allentown's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 54th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 26% wettest
- Allentown's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- 61st percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Allentown compares across U.S. station-mapped locations
Allentown'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
Allentown's measured station temperature trend
MethodologyAcross 90 complete annual observations from 1925 to 2025, ALLENTOWN INTL AP warmed at a fitted rate of 0.27°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Allentown primary station fitted change +0.27 °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 | 38°F (4°C) | 22°F (-6°C) | 30°F (-1°C) | 3.3" | 9.8" | 26.7 | 0.0 |
| February | 42°F (5°C) | 23°F (-5°C) | 32°F (0°C) | 2.8" | 10.8" | 23.8 | 0.0 |
| March | 51°F (10°C) | 31°F (-1°C) | 41°F (5°C) | 3.6" | 6.3" | 19.3 | 0.0 |
| April | 63°F (17°C) | 40°F (5°C) | 52°F (11°C) | 3.7" | 0.5" | 6.1 | 0.2 |
| May | 74°F (23°C) | 51°F (10°C) | 62°F (17°C) | 3.6" | 0.0" | 0.4 | 1.1 |
| June | 82°F (28°C) | 60°F (16°C) | 71°F (22°C) | 4.4" | 0.0" | 0.0 | 3.1 |
| July | 86°F (30°C) | 65°F (18°C) | 76°F (24°C) | 5.3" | 0.0" | 0.0 | 7.7 |
| August | 84°F (29°C) | 63°F (17°C) | 74°F (23°C) | 4.6" | 0.0" | 0.0 | 4.5 |
| September | 77°F (25°C) | 55°F (13°C) | 66°F (19°C) | 4.8" | 0.0" | 0.0 | 1.5 |
| October | 66°F (19°C) | 44°F (7°C) | 55°F (13°C) | 4.1" | 0.2" | 3.1 | 0.1 |
| November | 54°F (12°C) | 34°F (1°C) | 44°F (7°C) | 3.2" | 0.9" | 14.9 | 0.0 |
| December | 43°F (6°C) | 27°F (-3°C) | 35°F (2°C) | 3.9" | 4.6" | 23.8 | 0.0 |
The year, day by day
Summer here tops out rather than builds: the warmest normal high is 87°F around July 14, short of 90°F on every date, while 120 dates carry a normal low at or below freezing, the coldest 21°F near January 23.
The freezing stretch
The normal low stays at or below 32°F into March 21, then returns to freezing around November 23, covering 120 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 23, when 40% of years recorded at least a hundredth of an inch. The driest is November 3 at 30%. Summed across the calendar, that is about 129 wet dates a year.
The widest day
April 24 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 Allentown.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 9.8"
11.4 days with precipitation
Snow: 10.8"
10.1 days with precipitation
Snow: 6.3"
10.9 days with precipitation
Snow: 0.5"
11.8 days with precipitation
12.4 days with precipitation
11.4 days with precipitation
11.0 days with precipitation
10.2 days with precipitation
9.6 days with precipitation
Snow: 0.2"
9.9 days with precipitation
Snow: 0.9"
8.9 days with precipitation
Snow: 4.6"
11.5 days with precipitation
Allentown spreads its precipitation across the year
Neither half of the year dominates here: June through August take 30% of the annual total and December through February 21%, with neither reaching the 35% that would mark a distinct wet season. Allentown has no dry season to plan around, though it does carry a wide 45.5°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: July averages 5.3" and February 2.8". 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.
When it rains in Allentown, it arrives in quantity
47.4" of precipitation falls across only about 129 wet days here, averaging 0.37 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 129 a year, 35% of all days
- Average depth per wet day
- 0.37 inches
- Most wet days
- May, about 12
- Fewest wet days
- November, about 9
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Winter brings real snow to Allentown
Allentown averages 33.1 inches of snowfall a year, with February the snowiest month on the normals, spread across roughly 16 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: 33.1 inches of depth.
- Days recording measurable snow: about 16 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 7% 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 24
50% probability date
Last Spring Freeze
April 20
50% probability date
Growing Season
187 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
5,293
Higher = more heating needed
Cooling Degree Days
981
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 | 63% | 7.9 | 43% | 35% |
| February | 60% | 8.7 | 41% | 38% |
| March | 57% | 8.6 | 44% | 35% |
| April | 59% | 7.7 | 46% | 28% |
| May | 66% | 6.8 | 42% | 25% |
| June | 67% | 6.1 | 50% | 14% |
| July | 70% | 5.5 | 48% | 17% |
| August | 71% | 5.6 | 51% | 17% |
| September | 73% | 6.1 | 49% | 26% |
| October | 68% | 6.8 | 49% | 30% |
| November | 69% | 7.2 | 42% | 35% |
| December | 67% | 7.7 | 41% | 39% |
Nationwide similar cities
Other rankable U.S. places outside PA closest to Allentown 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 (53°F here).
- Dallas, OR 53°F · 0.0°F off
- Danville, IL 53°F · 0.0°F off
- Decatur, IL 53°F · 0.0°F off
- Downieville, CA 53°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (47.4" here), excluding temperature-peer places.
- Meredith, NH 47.4" · 0.0" off
- Sissonville, WV 47.4" · 0.0" off
- Columbus, IN 47.3" · 0.0" off
- Snow Hill, MD 47.4" · 0.0" off
Snow and freeze rhythm
When cold and snow define Allentown
heating led · wet · mid swing
Allentown's energy balance leans toward cold weather: 5,293 annual heating degree days against 981 for cooling. Its 45.5°F seasonal range still makes the monthly rows more useful than the annual average alone.
Allentown's frost-free season lasts about 187 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Allentown coldest normal
January
The monthly mean of 30°F (-1°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Allentown typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Allentown snow peak
February
Allentown averages 33.1 inches of snow a year, with February the snowiest month on the normals.
Questions about Allentown's climate
How much snow does Allentown get? ▼
How cold does Allentown get in winter? ▼
How much energy does heating and cooling require in Allentown? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Allentown's primary station: ALLENTOWN INTL AP (USW00014737). 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 4202000). Match rule for Allentown: 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 Allentown 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.