Boonton, New Jersey climate: Normal weather by month, frost dates and records
Boonton's normal year runs from 21°F January nights to 85°F July afternoons, with 49.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.0°C, January lows of −6°C, July highs of 30°C, 1,249 mm of precipitation a year.
- NOAA stationBoonton (1 mi SE)
- Station IDUSC00280907
- Location40.89°N 74.40°W
- Elevation280 ft (85 m)
- From the center1 miles
- Population8,894
On October 23, the normal high in Boonton is 62°F and the normal low 40°F, and the chance of measurable rain or snow is 34%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Boonton.
- Jan 38° 21°
- Feb 40° 22°
- Mar 48° 29°
- Apr 61° 39°
- May 71° 49°
- Jun 81° 59°
- Jul 85° 64°
- Aug 84° 62°
- Sep 77° 54°
- Oct 64° 42°
- Nov 53° 33°
- Dec 42° 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 Boonton 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 June (4.91 in), the least in February (2.79 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 38°F | 21°F | 29.1°F | 3.73 | 11 | <1 | 27 | 9 h 30 min |
| February | 40°F | 22°F | 30.9°F | 2.79 | 10 | <1 | 25 | 10 h 40 min |
| March | 48°F | 29°F | 38.5°F | 4.16 | 11 | <1 | 22 | 11 h 50 min |
| April | 61°F | 39°F | 50.1°F | 3.63 | 12 | <1 | 6 | 13 h 20 min |
| May | 71°F | 49°F | 60.1°F | 3.95 | 13 | 1 | <1 | 14 h 30 min |
| June | 81°F | 59°F | 69.7°F | 4.91 | 12 | 2 | <1 | 15 h 10 min |
| July | 85°F | 64°F | 74.7°F | 4.70 | 11 | 8 | <1 | 14 h 50 min |
| August | 84°F | 62°F | 72.8°F | 3.67 | 10 | 4 | <1 | 13 h 50 min |
| September | 77°F | 54°F | 65.5°F | 4.68 | 9 | 2 | <1 | 12 h 30 min |
| October | 64°F | 42°F | 53.2°F | 4.54 | 11 | <1 | 4 | 11 h 10 min |
| November | 53°F | 33°F | 42.8°F | 4.06 | 8 | <1 | 16 | 10 h |
| December | 42°F | 26°F | 34.3°F | 4.36 | 12 | <1 | 24 | 9 h 20 min |
| Year (annual) | 62°F | 42°F | 51.8°F | 49.18 | 131 | 16 | 124 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 3°C | −6°C | −1.6°C | 95 mm |
| February | 4°C | −6°C | −0.6°C | 71 mm |
| March | 9°C | −2°C | 3.6°C | 106 mm |
| April | 16°C | 4°C | 10.1°C | 92 mm |
| May | 22°C | 10°C | 15.6°C | 100 mm |
| June | 27°C | 15°C | 20.9°C | 125 mm |
| July | 30°C | 18°C | 23.7°C | 119 mm |
| August | 29°C | 17°C | 22.7°C | 93 mm |
| September | 25°C | 12°C | 18.6°C | 119 mm |
| October | 18°C | 6°C | 11.8°C | 115 mm |
| November | 11°C | 1°C | 6.0°C | 103 mm |
| December | 6°C | −3°C | 1.3°C | 111 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Canoe Brook (10 miles away), gets 24 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00280907; 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 Boonton?
Normal highs sit between 65°F and 85°F in May, June, August and September. Of those, September has the fewest days with rain (9).
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 USC00280907.
When is the last frost in Boonton?
In Boonton, the last spring frost (32°F) comes after April 17 in half of years and after May 5 in one year in ten; the first autumn frost comes before October 23 in half of years and before October 8 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 171 year in 10 after May 5; 9 in 10 after April 4
- First autumn frost, half of years before
- October 231 year in 10 before October 8; 9 in 10 before November 6
NOAA puts the median frost-free season at 189 days, and the season without a hard freeze (28°F) at 212 days.
A hard freeze (28°F) comes after April 4 in half of springs and before November 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Boonton in zone 6b in ZIP code 07005. By the map's own method, the average of each year's coldest night over 1991-2020, Boonton's NOAA station is in zone 7a: the coldest night of a typical year reaches 2°F (19 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 New Jersey · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00280907; 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 Boonton?
In a normal year in Boonton, 16 days a year reach 90°F, 124 nights fall to 32°F or colder and 131 days bring measurable precipitation.
- Days at 90°F or more
- 16a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 124a normal year
- Days that stay below freezing
- 23high of 32°F or less
- Days with 0.01 inch of precipitation
- 131a normal year
The highest temperature in this station's record (since 1892) is 104°F, on September 3, 1953; the lowest is −21°F, on December 30, 1917.
The wettest calendar year on that record is 2018, with 76.58 in; the snowiest season is 1966–67, with 81.8 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00280907; records: ACIS (NOAA Regional Climate Centers), station USC00280907. Records use complete months only; a month missing more than three days is left out.
How sunny is Boonton?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Boonton, 3.9 kWh per square metre a day. July is the sunniest month (80%) and December the cloudiest (66%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 68% | 1.9 |
| February | 71% | 2.8 |
| March | 69% | 3.7 |
| April | 71% | 4.8 |
| May | 70% | 5.4 |
| June | 76% | 6.0 |
| July | 80% | 6.0 |
| August | 78% | 5.2 |
| September | 76% | 4.3 |
| October | 71% | 3.0 |
| November | 72% | 2.2 |
| December | 66% | 1.6 |
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 Boonton need?
A normal year in Boonton brings 5,631 heating degree days, 5% more than the median U.S. place (5,373), and 865 cooling degree days, 5% 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 3,151 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,113 | 0 |
| February | 955 | 0 |
| March | 820 | 0 |
| April | 451 | 4 |
| May | 191 | 41 |
| June | 26 | 169 |
| July | 1 | 302 |
| August | 4 | 247 |
| September | 83 | 97 |
| October | 371 | 7 |
| November | 665 | 0 |
| December | 952 | 0 |
| Year (annual) | 5,631 | 865 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00280907. 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 Boonton been warmer than normal lately?
2025 averaged 52.1°F, 0.3°F above the 1991-2020 normal of 51.8°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 53.0°F | +1.2°F | 47.88 |
| 2022 | 52.4°F | +0.6°F | 49.68 |
| 2023 | 53.8°F | +2.0°F | 61.87 |
| 2024 | 54.0°F | +2.2°F | 52.82 |
| 2025 | 52.1°F | +0.3°F | 40.76 |
Over 78 complete years from 1917 to 2025, the station's annual mean temperature rose at a fitted 3.6°F per century (+0.20°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00280907; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Boonton's climate compare?
Boonton is warmer than 5 of the other 32 places with their own NOAA record in New Jersey, and wetter than 19. Across the 7,247 U.S. stations with normals, its annual mean of 51.8°F is warmer than 49%.
In the Köppen classification computed from these normals, Boonton 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 Boonton share this climate record?
19 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.
- Parsippany, NJ21,869 people · 2 mi SW
- Dover, NJ18,909 people · 9 mi W
- Lake Hiawatha, NJ10,406 people · 1 mi SE
- Whippany, NJ8,862 people · 5 mi S
- White Meadow Lake, NJ8,706 people · 6 mi W
- Wharton, NJ7,444 people · 9 mi W
- Rockaway, NJ6,651 people · 6 mi W
- Morris Plains, NJ6,590 people · 5 mi SW
- Pine Brook, NJ6,017 people · 3 mi SE
- Towaco, NJ5,627 people · 4 mi NE
- Troy Hills, NJ5,183 people · 3 mi S
- Cedar Knolls, NJ4,754 people · 6 mi SW
- Mountain Lakes, NJ4,644 people · 2 mi W
- Mount Hope, NJ3,082 people · 8 mi W
- Victory Gardens, NJ1,596 people · 8 mi W
- Rainbow Lakes, NJ1,376 people · 3 mi W
- Brookside, NJ1,287 people · 11 mi SW
- Mount Tabor, NJ1,127 people · 4 mi W
- Hibernia, NJ136 people · 7 mi NW
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 Boonton's climate
What is the coldest month in Boonton?
January, with a normal high of 38°F and a normal low of 21°F. The warmest is July (85°F by day, 64°F at night).
Does it snow in Boonton?
Yes. NOAA publishes no 1991-2020 snowfall normal for Boonton's NOAA station; the nearest record that keeps one, Canoe Brook (10 miles away), records 24 inches of snow in a normal year.
What is the rainiest month in Boonton?
June, with 4.91 in of precipitation in a normal year; the driest is February with 2.79 in.
What plant hardiness zone is Boonton in?
The USDA's 2023 map puts Boonton in zone 6b in ZIP code 07005. By the same method at Boonton's NOAA station, the coldest night of a typical year reaches 2°F (19 years, 1991-2020): zone 7a.
How late can frost come in Boonton?
In half of years the last 32°F night comes after April 17; in one year in ten it comes after May 5. Waiting until May 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- New Jersey climateThe statewide normals and every place in the state
- Caldwell, NJ6 miles from this station, 53.1°F a year
- Essex Fells, NJ7 miles from this station, 52.5°F a year
- Little Falls, NJ9 miles from this station, 53.1°F a year
- Charlotteburg Reservoir, NJ10 miles from this station, 50.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made