Caldwell, New Jersey climate: Normal weather by month, frost dates and records
Caldwell's normal year runs from 23°F January nights to 85°F July afternoons, with 44.9 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.7°C, January lows of −5°C, July highs of 30°C, 1,140 mm of precipitation a year.
- NOAA stationCaldwell Essex County Airport
- Station IDUSW00054743
- Location40.88°N 74.28°W
- Elevation173 ft (53 m)
- From the center3 miles
- Population9,326
On October 14, the normal high in Caldwell is 65°F and the normal low 46°F, and the chance of measurable rain or snow is 38%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Caldwell.
- Jan 38° 23°
- Feb 41° 24°
- Mar 49° 31°
- Apr 62° 41°
- May 72° 51°
- Jun 81° 60°
- Jul 85° 66°
- Aug 84° 64°
- Sep 76° 57°
- Oct 65° 45°
- Nov 53° 35°
- Dec 43° 28°
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 Caldwell each month?
July is the warmest month, with normal highs of 85°F; January the coldest, with normal lows of 23°F. The most precipitation falls in August (4.49 in), the least in February (2.55 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 38°F | 23°F | 30.6°F | 3.04 | 10 | <1 | 26 | 9 h 30 min |
| February | 41°F | 24°F | 32.6°F | 2.55 | 9 | <1 | 24 | 10 h 40 min |
| March | 49°F | 31°F | 40.4°F | 4.07 | 11 | <1 | 18 | 11 h 50 min |
| April | 62°F | 41°F | 51.4°F | 3.71 | 11 | <1 | 4 | 13 h 20 min |
| May | 72°F | 51°F | 61.5°F | 3.39 | 13 | 1 | <1 | 14 h 30 min |
| June | 81°F | 60°F | 70.4°F | 4.27 | 13 | 4 | <1 | 15 h 10 min |
| July | 85°F | 66°F | 75.6°F | 4.33 | 11 | 9 | <1 | 14 h 50 min |
| August | 84°F | 64°F | 73.9°F | 4.49 | 12 | 5 | <1 | 13 h 50 min |
| September | 76°F | 57°F | 66.3°F | 3.72 | 11 | 1 | <1 | 12 h 30 min |
| October | 65°F | 45°F | 54.7°F | 3.97 | 12 | <1 | 2 | 11 h 10 min |
| November | 53°F | 35°F | 44.4°F | 3.30 | 9 | <1 | 12 | 10 h |
| December | 43°F | 28°F | 35.4°F | 4.04 | 11 | <1 | 23 | 9 h 20 min |
| Year (annual) | 62°F | 44°F | 53.1°F | 44.88 | 133 | 21 | 108 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 3°C | −5°C | −0.8°C | 77 mm |
| February | 5°C | −5°C | 0.3°C | 65 mm |
| March | 10°C | 0°C | 4.7°C | 103 mm |
| April | 17°C | 5°C | 10.8°C | 94 mm |
| May | 22°C | 11°C | 16.4°C | 86 mm |
| June | 27°C | 16°C | 21.3°C | 108 mm |
| July | 30°C | 19°C | 24.2°C | 110 mm |
| August | 29°C | 18°C | 23.3°C | 114 mm |
| September | 24°C | 14°C | 19.1°C | 94 mm |
| October | 18°C | 7°C | 12.6°C | 101 mm |
| November | 12°C | 2°C | 6.9°C | 84 mm |
| December | 6°C | −2°C | 1.9°C | 103 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 USW00054743; 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 Caldwell?
Normal highs sit between 65°F and 85°F in May, June, 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 USW00054743.
When is the last frost in Caldwell?
In Caldwell, the last spring frost (32°F) comes after April 14 in half of years and after April 30 in one year in ten; the first autumn frost comes before October 28 in half of years and before October 13 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 141 year in 10 after April 30; 9 in 10 after April 1
- First autumn frost, half of years before
- October 281 year in 10 before October 13; 9 in 10 before November 11
NOAA puts the median frost-free season at 196 days, and the season without a hard freeze (28°F) at 221 days.
A hard freeze (28°F) comes after April 1 in half of springs and before November 9 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Caldwell in zone 7a in ZIP code 07006. By the map's own method, the average of each year's coldest night over 1991-2020, Caldwell's NOAA station is in zone 7a: the coldest night of a typical year reaches 4°F (20 complete years).
Frost dates for every NOAA station in New Jersey · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USW00054743; 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 Caldwell?
In a normal year in Caldwell, 21 days a year reach 90°F (1 of them 100°F or more), 108 nights fall to 32°F or colder and 133 days bring measurable precipitation.
- Days at 90°F or more
- 21a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 108a normal year
- Days that stay below freezing
- 20high of 32°F or less
- Days with 0.01 inch of precipitation
- 133a normal year
The highest temperature in this station's record (since 1999) is 103°F, on July 22, 2011; the lowest is −4°F, on February 24, 2015.
The wettest calendar year on that record is 2011, with 69.07 in.
Source: NOAA NCEI 1991-2020 annual normals, station USW00054743; records: ACIS (NOAA Regional Climate Centers), station USW00054743. Records use complete months only; a month missing more than three days is left out.
How sunny is Caldwell?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Caldwell, 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 Caldwell need?
A normal year in Caldwell brings 5,272 heating degree days, 2% fewer than the median U.S. place (5,373), and 973 cooling degree days, 7% more 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 3,385 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,066 | 0 |
| February | 906 | 0 |
| March | 764 | 0 |
| April | 417 | 11 |
| May | 160 | 52 |
| June | 24 | 186 |
| July | 1 | 329 |
| August | 3 | 279 |
| September | 65 | 105 |
| October | 329 | 11 |
| November | 618 | 0 |
| December | 919 | 0 |
| Year (annual) | 5,272 | 973 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00054743. 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 Caldwell been warmer than normal lately?
2025 averaged 54.2°F, 1.1°F above the 1991-2020 normal of 53.1°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 56.6°F | +3.5°F | 51.57 |
| 2022 | 55.3°F | +2.2°F | 43.71 |
| 2023 | 56.1°F | +3.0°F | – |
| 2024 | 56.7°F | +3.6°F | 45.57 |
| 2025 | 54.2°F | +1.1°F | – |
Source: observed years: ACIS, station USW00054743. A year counts only with all twelve months complete.
How does Caldwell's climate compare?
Caldwell is warmer than 12 of the other 32 places with their own NOAA record in New Jersey, and wetter than 3. Across the 7,247 U.S. stations with normals, its annual mean of 53.1°F is warmer than 54%.
In the Köppen classification computed from these normals, Caldwell 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 Caldwell share this climate record?
2 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.
- Lincoln Park, NJ11,030 people · 3 mi N
- North Caldwell, NJ6,769 people · 1 mi SE
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 Caldwell's climate
What is the coldest month in Caldwell?
January, with a normal high of 38°F and a normal low of 23°F. The warmest is July (85°F by day, 66°F at night).
Does it snow in Caldwell?
Yes. NOAA publishes no 1991-2020 snowfall normal for Caldwell'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 Caldwell?
August, with 4.49 in of precipitation in a normal year; the driest is February with 2.55 in.
What plant hardiness zone is Caldwell in?
The USDA's 2023 map puts Caldwell in zone 7a in ZIP code 07006. By the same method at Caldwell's NOAA station, the coldest night of a typical year reaches 4°F (20 years, 1991-2020): zone 7a.
How late can frost come in Caldwell?
In half of years the last 32°F night comes after April 14; in one year in ten it comes after April 30. Waiting until April 30 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
- Little Falls, NJ3 miles from this station, 53.1°F a year
- Essex Fells, NJ3 miles from this station, 52.5°F a year
- Boonton, NJ6 miles from this station, 51.8°F a year
- Canoe Brook, NJ10 miles from this station, 53.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made