Lambertville, New Jersey climate: Normal weather by month, frost dates and records
Lambertville's normal year runs from 19°F January nights to 88°F July afternoons, with 50.4 inches of precipitation and 13 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.7°C, January lows of −7°C, July highs of 31°C, 1,279 mm of precipitation a year.
- NOAA stationLambertville
- Station IDUSC00284635
- Location40.36°N 74.94°W
- Elevation68 ft (21 m)
- From the centerunder 1 mile
- Population4,197
On October 23, the normal high in Lambertville is 65°F and the normal low 38°F, and the chance of measurable rain or snow is 30%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Lambertville.
- Jan 42° 19°
- Feb 44° 22°
- Mar 52° 29°
- Apr 64° 39°
- May 74° 49°
- Jun 83° 58°
- Jul 88° 64°
- Aug 87° 61°
- Sep 80° 54°
- Oct 68° 40°
- Nov 56° 32°
- Dec 46° 25°
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 Lambertville each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 19°F. The most precipitation falls in July (5.11 in), the least in February (2.86 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 42°F | 19°F | 30.2°F | 3.65 | 5.8 | 10 | <1 | 27 | 9 h 40 min |
| February | 44°F | 22°F | 33.0°F | 2.86 | 2.4 | 9 | <1 | 24 | 10 h 40 min |
| March | 52°F | 29°F | 40.7°F | 4.33 | 2.6 | 11 | <1 | 21 | 11 h 50 min |
| April | 64°F | 39°F | 51.6°F | 3.81 | 0.2 | 11 | <1 | 10 | 13 h 10 min |
| May | 74°F | 49°F | 61.9°F | 4.32 | 0.0 | 12 | 2 | <1 | 14 h 20 min |
| June | 83°F | 58°F | 70.5°F | 4.78 | 0.0 | 11 | 6 | <1 | 15 h |
| July | 88°F | 64°F | 75.9°F | 5.11 | 0.0 | 10 | 11 | <1 | 14 h 50 min |
| August | 87°F | 61°F | 73.6°F | 4.69 | 0.0 | 9 | 9 | <1 | 13 h 50 min |
| September | 80°F | 54°F | 66.7°F | 4.44 | 0.0 | 8 | 2 | <1 | 12 h 30 min |
| October | 68°F | 40°F | 54.2°F | 4.26 | 0.0 | 10 | <1 | 9 | 11 h 10 min |
| November | 56°F | 32°F | 44.0°F | 3.50 | 0.2 | 9 | <1 | 18 | 10 h |
| December | 46°F | 25°F | 35.4°F | 4.61 | 2.2 | 11 | <1 | 26 | 9 h 20 min |
| Year (annual) | 65°F | 41°F | 53.1°F | 50.36 | 13.4 | 121 | 30 | 136 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 5°C | −7°C | −1.0°C | 93 mm | 15 cm |
| February | 7°C | −6°C | 0.6°C | 73 mm | 6 cm |
| March | 11°C | −2°C | 4.8°C | 110 mm | 7 cm |
| April | 18°C | 4°C | 10.9°C | 97 mm | 1 cm |
| May | 24°C | 10°C | 16.6°C | 110 mm | 0 cm |
| June | 29°C | 14°C | 21.4°C | 121 mm | 0 cm |
| July | 31°C | 18°C | 24.4°C | 130 mm | 0 cm |
| August | 30°C | 16°C | 23.1°C | 119 mm | 0 cm |
| September | 27°C | 12°C | 19.3°C | 113 mm | 0 cm |
| October | 20°C | 5°C | 12.3°C | 108 mm | 0 cm |
| November | 13°C | 0°C | 6.7°C | 89 mm | 1 cm |
| December | 8°C | −4°C | 1.9°C | 117 mm | 6 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00284635; 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 Lambertville?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September has the fewest days with rain (8).
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 USC00284635.
When is the last frost in Lambertville?
In Lambertville, the last spring frost (32°F) comes after April 16 in half of years and after April 30 in one year in ten; the first autumn frost comes before October 19 in half of years and before October 4 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 161 year in 10 after April 30; 9 in 10 after April 2
- First autumn frost, half of years before
- October 191 year in 10 before October 4; 9 in 10 before November 4
NOAA puts the median frost-free season at 185 days, and the season without a hard freeze (28°F) at 208 days.
A hard freeze (28°F) comes after April 3 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Lambertville in zone 7a in ZIP code 08530, the nearest ZIP area.
Frost dates for every NOAA station in New Jersey · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00284635; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Lambertville?
In a normal year in Lambertville, 30 days a year reach 90°F (1 of them 100°F or more), 136 nights fall to 32°F or colder and 121 days bring measurable precipitation.
- Days at 90°F or more
- 30a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 136a normal year
- Days that stay below freezing
- 11high of 32°F or less
- Days with 0.01 inch of precipitation
- 121a normal year
- Days with 1 inch of snow or more
- 4a normal year
The highest temperature in this station's record (since 1931) is 104°F, on July 10, 1936; the lowest is −18°F, on February 9, 1934.
The wettest calendar year on that record is 1979, with 59.49 in; the snowiest season is 1960–61, with 63.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00284635; records: ACIS (NOAA Regional Climate Centers), station USC00284635. Records use complete months only; a month missing more than three days is left out.
How sunny is Lambertville?
Over a year 73% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Lambertville, 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 Lambertville need?
A normal year in Lambertville brings 5,277 heating degree days, 2% fewer than the median U.S. place (5,373), and 992 cooling degree days, 9% 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 3,377 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,077 | 0 |
| February | 897 | 0 |
| March | 752 | 1 |
| April | 410 | 7 |
| May | 153 | 55 |
| June | 27 | 194 |
| July | 1 | 337 |
| August | 5 | 271 |
| September | 65 | 117 |
| October | 344 | 11 |
| November | 629 | 0 |
| December | 917 | 0 |
| Year (annual) | 5,277 | 992 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00284635. 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.
How does Lambertville's climate compare?
Lambertville is warmer than 12 of the other 32 places with their own NOAA record in New Jersey, and wetter than 22. 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, Lambertville 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 Lambertville share this climate record?
6 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.
- Richboro, PA7,033 people · 10 mi S
- Newtown Grant, PA6,070 people · 7 mi S
- Plumsteadville, PA2,948 people · 10 mi W
- New Hope, PA2,641 people · 1 mi W
- Dublin, PA2,278 people · 14 mi W
- Ivyland, PA952 people · 12 mi SW
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 Lambertville's climate
What is the coldest month in Lambertville?
January, with a normal high of 42°F and a normal low of 19°F. The warmest is July (88°F by day, 64°F at night).
Does it snow in Lambertville?
Yes: 13 inches in a normal year, falling on 5 days with 0.1 inch or more, the most in January (5.8 inches).
What is the rainiest month in Lambertville?
July, with 5.11 in of precipitation in a normal year; the driest is February with 2.86 in.
What plant hardiness zone is Lambertville in?
The USDA's 2023 map puts Lambertville in zone 7a in ZIP code 08530, the nearest ZIP area.
How late can frost come in Lambertville?
In half of years the last 32°F night comes after April 16; 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
- Trenton, NJ9 miles from this station, 54.1°F a year
- Doylestown, PA9 miles from this station, 53.4°F a year
- Wertsville (4 mi NE), NJ11 miles from this station, 52.5°F a year
- Neshaminy Falls, PA14 miles from this station, 52.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made