Harrison, NJ Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Harrison's primary NOAA station, HARRISON.
The climate verdict for Harrison
Water is the standout signal in Harrison, New Jersey: 50.4 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 55°F. At 53/100 (moderate) the climate comfort score falls in the bottom third of the station-mapped U.S. score corpus, exceeding only 31% of scores.
- 55°F
- average temperature, NOAA 1991-2020 normal
- 53/100
- comfort score, above 31% of station-mapped location scores
- 50.4"
- annual precipitation · 28" snow
- 216 days
- frost-free growing season
Harrison: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00283704 · Harrison, NJ 55°F mean · 50.4" precip
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-WET · SWING-WIDE · COMF-LOW · LOAD-HEAT · STN-1 · BOOK-FULL
- TEMP-COOL 55°F
- RANK-MID #4,048
- PHOTO-FINISH ≈ Freedom
- PRCP-WET 50.4"
- SWING-WIDE 46°F
- COMF-LOW 53/100
- LOAD-HEAT 4,896 HDD
- STN-1 USC00283704
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Freedom, MO (+ 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 NJ station list.
- Harrison (this station) 55°F
- Cold Potosi, MO 55°F
- Hot Norristown, PA 55°F
- Near Freedom, MO 55°F
- Near Cincinnati Nort…, KY 55°F
Climate Living Index · Harrison
Harrison: 62/100 · grade C
Harrison publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Harrison, not an official NOAA rating. Rankings still use Comfort Score 53/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 96 calendar days | 77/100 · B |
| Frost-free season | 216 days/year | 75/100 · B |
| Annual temperature balance | 54.8°F · 12.7° from 67.5°F | 59/100 · C |
| Precipitation balance | 50.4 in · 15.4 from 35 in | 46/100 · D |
| Snowfall burden | 28.2 inches/year | 40/100 · D |
Harrison · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Harrison is a temperate Köppen climate: Cfa
Coldest-month mean 32.1°F and warmest-month mean 77.9°F place this station in temperate, no dry season, hot summer climates (Cfa). Class Cfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, hot summer.
- Köppen code
- Cfa
- Group
- Temperate
- Warmest month
- 77.9°F
- Coldest month
- 32.1°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 Harrison sits across the climate record
Three NOAA fields for Harrison's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- 59th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Annual precipitation
- Top 19% wettest
- Harrison's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- 63rd percentile swing
- Typical seasonal amplitude versus 6,861 complete station-years.
How Harrison compares across U.S. station-mapped locations
Harrison's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
53 31st percentile score exceeds 31% 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%). This entry sits in this band.
- 60–70: 1,236 station-mapped locations (20%). Above this entry.
- 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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 39°F (4°C) | 25°F (-4°C) | 32°F (0°C) | 3.7" | 8.0" | 22.8 | 0.0 |
| February | 42°F (6°C) | 26°F (-3°C) | 34°F (1°C) | 3.3" | 8.4" | 20.9 | 0.0 |
| March | 50°F (10°C) | 33°F (0°C) | 41°F (5°C) | 4.3" | 4.7" | 13.5 | 0.0 |
| April | 62°F (17°C) | 43°F (6°C) | 52°F (11°C) | 4.1" | 0.7" | 1.9 | 0.4 |
| May | 72°F (22°C) | 54°F (12°C) | 63°F (17°C) | 4.4" | 0.0" | 0.0 | 1.9 |
| June | 82°F (28°C) | 63°F (17°C) | 72°F (22°C) | 4.9" | 0.0" | 0.0 | 5.4 |
| July | 87°F (30°C) | 69°F (21°C) | 78°F (26°C) | 4.8" | 0.0" | 0.0 | 12.1 |
| August | 85°F (29°C) | 67°F (19°C) | 76°F (24°C) | 4.4" | 0.0" | 0.0 | 8.9 |
| September | 78°F (25°C) | 60°F (16°C) | 69°F (20°C) | 4.3" | 0.0" | 0.0 | 2.3 |
| October | 66°F (19°C) | 48°F (9°C) | 57°F (14°C) | 4.2" | 0.2" | 0.3 | 0.0 |
| November | 54°F (12°C) | 38°F (3°C) | 46°F (8°C) | 3.6" | 0.3" | 5.3 | 0.0 |
| December | 44°F (7°C) | 31°F (-1°C) | 37°F (3°C) | 4.6" | 5.9" | 17.8 | 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 96 dates carry a normal low at or below freezing, the coldest 24°F near January 25.
The freezing stretch
The normal low stays at or below 32°F into March 14, then returns to freezing around December 10, covering 96 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 17, when 38% of years recorded at least a hundredth of an inch. The driest is September 11 at 27%. Summed across the calendar, that is about 120 wet dates a year.
The widest day
April 24 carries the biggest normal gap between afternoon and dawn, 19°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Harrison.
Where Harrison Stands Nationally
Among the steadiest day-night climates ranked: even the widest normal daily swing holds to roughly 19°F.
The normal water year runs well above the national norm at roughly 50 inches.
Harrison earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 8.0"
10.9 days with precipitation
Snow: 8.4"
9.5 days with precipitation
Snow: 4.7"
10.5 days with precipitation
Snow: 0.7"
10.9 days with precipitation
11.8 days with precipitation
10.5 days with precipitation
8.6 days with precipitation
9.9 days with precipitation
8.2 days with precipitation
Snow: 0.2"
9.3 days with precipitation
Snow: 0.3"
8.7 days with precipitation
Snow: 5.9"
10.7 days with precipitation
Harrison spreads its precipitation across the year
Neither half of the year dominates here: June through August take 28% of the annual total and December through February 23%, with neither reaching the 35% that would mark a distinct wet season. Harrison has no dry season to plan around, though it does carry a wide 45.8°F gap between its warmest and coldest month.
The gap between the wettest and driest month still matters: June averages 4.9" and February 3.3". The three wettest months together take 28% 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 Harrison, it arrives in quantity
50.4" of precipitation falls across only about 120 wet days here, averaging 0.42 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 120 a year, 33% of all days
- Average depth per wet day
- 0.42 inches
- Most wet days
- May, about 12
- Fewest wet days
- September, about 8
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 Harrison
Harrison averages 28.2 inches of snowfall a year, with February the snowiest month on the normals, spread across roughly 12 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: 28.2 inches of depth.
- Days recording measurable snow: about 12 a year.
- At a rough ten-to-one melt ratio, snow accounts for on the order of 6% 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
November 6
50% probability date
Last Spring Freeze
April 4
50% probability date
Growing Season
216 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,896
Higher = more heating needed
Cooling Degree Days
1,219
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside NJ closest to Harrison 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 (55°F here).
- Courtland, KS 55°F · 0.0°F off
- Cynthiana, KY 55°F · 0.0°F off
- Free Union, VA 55°F · 0.0°F off
- Greensburg, KS 55°F · 0.0°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (50.4" here), excluding temperature-peer places.
- Waycross, GA 50.4" · 0.0" off
- Henderson, TX 50.4" · 0.0" off
- Shelby, NC 50.4" · 0.0" off
- Holly Hill, SC 50.5" · 0.0" off
Snow and freeze rhythm
When cold and snow define Harrison
heating led · wet · mid swing
Harrison's energy balance leans toward cold weather: 4,896 annual heating degree days against 1,219 for cooling. Its 45.8°F seasonal range still makes the monthly rows more useful than the annual average alone.
Harrison's frost-free season lasts about 216 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
-
1. Harrison coldest normal
January
The monthly mean of 32°F (0°C) sits near freezing, so cold nights and above-freezing afternoons share the same month.
-
2. Harrison typical freeze period
January through December
The station reports average freezing days from January through December.
-
3. Harrison snow peak
February
Harrison averages 28.2 inches of snow a year, with February the snowiest month on the normals.
Questions about Harrison's climate
How much snow does Harrison get? ▼
How many days above 90°F does Harrison get? ▼
How much energy does heating and cooling require in Harrison? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Harrison's primary station: HARRISON (USC00283704). 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 3430210). Match rule for Harrison: 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 Harrison 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.