Photo: EvanSheppard · CC BY 4.0Allendale gets more rain and snow than 79% of U.S. towns: 49 inches of precipitation a year
The coldest hours of a January night bottom out at 21° on average. From frosty January to warm July, readings climb 64°. Central heating does most of its work from November to March, in months below 50° on average.
A year in Allendale at a glance
Each month’s typical high and low, and what it brings.
What stands out about Allendale’s climate
Compared with towns across the U.S., with Allendale’s place in New Jersey beside it.
What a year in Allendale feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 188 frost-free days a year
In half of years the last 32° night comes by April 19 and the first by October 23. Frost and day counts come from NOAA’s station at Wanaque Raymond Dam, NJ, 8 miles from the town’s center, at about the same height.
The 2023 USDA map puts Allendale’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 2°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 33 inches of snow a winter
Snow, measured at Dobbs Ferry-ardsley, NY, falls mostly in February. Precipitation (rain plus melted snow) adds up to 49 inches a year; August is the wettest month and February the driest. Rain or snow falls on about 124 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Allendale
87% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from October through April.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Wanaque Raymond Dam, NJ.
Living with Allendale’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
188 frost-free days in zone 7a. The last frost comes by Apr 19 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 23.
Months with highs of 62–84° and lows of 40° or more: May, June, August, September and October. 5.7 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Allendale from natural hazards, river flooding is the largest share (75%); heat waves, cold waves, winter storms and ice storms together are 7%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Allendale and its neighbors
Every town next door is within a degree of Allendale in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Allendale’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Allendale, NJ | 21° | 85° | 49" | 33" |
| Hampstead, MD | 22° | 85° | 48" | 34" |
| New Freedom, PA | 21° | 84° | 48" | 29" |
| New Martinsville, WV | 22° | 85° | 46" | 27" |
| West Bridgewater, MA | 20° | 84° | 51" | 34" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Allendale averaged 2.1° warmer than the 1900s. The biggest change is in December (+3.5°).
A bigger shift than in 93% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Allendale compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Allendale’s place among New Jersey’s.
Allendale weather by month
Highs, lows and precipitation from NOAA’s grid at Allendale’s center; snow, wet days and snow on the ground from Dobbs Ferry-ardsley, NY. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 21° | 3.4" | 9.4" | 11 | 13 | 20° – 37° |
| February | 41° | 23° | 2.8" | 10.9" | 9 | 13 | 19° – 38° |
| March | 49° | 30° | 4.0" | 5.8" | 11 | 7 | 34° – 49° |
| April | 62° | 40° | 4.0" | 0.7" | 13 | 0 | 46° – 55° |
| May | 72° | 50° | 3.9" | 0.0" | 12 | 0 | 57° – 66° |
| June | 80° | 59° | 4.6" | 0.0" | 12 | 0 | 67° – 73° |
| July | 85° | 64° | 4.5" | 0.0" | 10 | 0 | 70° – 79° |
| August | 83° | 63° | 4.6" | 0.0" | 9 | 0 | 69° – 77° |
| September | 76° | 55° | 4.4" | 0.0" | 9 | 0 | 63° – 70° |
| October | 65° | 44° | 4.5" | 0.0" | 9 | 0 | 50° – 61° |
| November | 53° | 35° | 3.8" | 0.3" | 10 | 0 | 39° – 49° |
| December | 43° | 27° | 4.3" | 5.6" | 11 | 7 | 28° – 46° |
| Year | 62° | 43° | 48.7" | 32.7" | 124 | 39 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 19° to 38°. June is the most reliable, staying within 6°.
Where Allendale’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Allendale’s center.
- Snow: Dobbs Ferry-ardsley, NY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Wanaque Raymond Dam, NJ, 8 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Allendale’s climate
What is the weather like in Allendale?
A typical July afternoon reaches 85°, a January night drops to 21°, and about 33 inches of snow falls in a normal winter. Colder January nights than 52% of U.S. towns; hotter July afternoons than 51% of U.S. towns.
How cold does it get in Allendale in winter?
January nights average 21°. About 121 nights a year reach 32° or below and 2 reach 0° or below. In the coldest January of the last 30 years the month averaged 20°.
How much snow does Allendale get?
About 33 inches in a normal winter at Dobbs Ferry-ardsley, NY, most of it in February, with snow on the ground about 39 days a year.
How hot does it get in Allendale?
July, with a typical high of 85° and a low of 64°. About 14 days a year reach 90° (Wanaque Raymond Dam, NJ).
When is the first and last frost in Allendale?
In half of years the last spring frost (32°) comes by April 19 and the first fall frost by October 23, about 188 frost-free days, at Wanaque Raymond Dam, NJ.
What growing zone is Allendale in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 2°.
What is the best time of year to visit Allendale?
By one simple rule (highs of 62–84° and lows of 40° or more), May, June, August, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Allendale getting warmer?
Yes: 1991–2020 averaged 2.1° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 93% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Allendale.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.