Teunis Haring House · Photo: JERRYE AND ROY KLOTZ M.D. · CC BY-SA 4.0More precipitation falls on Old Tappan than on 73% of U.S. towns: 48 inches a year
January nights here settle around 22°. Decade by decade the climate has edged up, 2.2° above 1901–2000. Central heating does most of its work from November to March, in months below 50° on average.
A year in Old Tappan at a glance
Each month’s typical high and low, and what it brings.
What stands out about Old Tappan’s climate
Compared with towns across the U.S., with Old Tappan’s place in New Jersey beside it.
What a year in Old Tappan feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 189 frost-free days a year
In half of years the last 32° night comes by April 20 and the first by October 26. Frost and day counts come from NOAA’s station at Dobbs Ferry-ardsley, NY, 8 miles from the town’s center, 130 ft higher.
The 2023 USDA map puts Old Tappan’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 4°. 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 48 inches a year; July 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 Old Tappan
85% of the work is heating. Months averaging under 55° run from November 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 Dobbs Ferry-ardsley, NY.
Living with Old Tappan’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
189 frost-free days in zone 7a. The last frost comes by Apr 20 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 26.
Months with highs of 62–84° and lows of 40° or more: April, May, June, September and October. 3.5 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Old Tappan from natural hazards, river flooding is the largest share (75%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Old Tappan and its neighbors
Every town next door is within a degree of Old Tappan in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Old Tappan’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 |
|---|---|---|---|---|
| Old Tappan, NJ | 22° | 86° | 48" | 33" |
| Reisterstown, MD | 23° | 86° | 48" | 34" |
| Gettysburg, PA | 22° | 87° | 45" | 27" |
| Charleston, WV | 25° | 87° | 46" | 32" |
| Walton, KY | 23° | 86° | 47" | 23" |
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 Old Tappan averaged 2.2° warmer than the 1900s. The biggest change is in December (+3.6°).
A bigger shift than in 95% 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 Old Tappan compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Old Tappan’s place among New Jersey’s.
Old Tappan weather by month
Highs, lows and precipitation from NOAA’s grid at Old Tappan’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 | 39° | 22° | 3.3" | 9.4" | 11 | 13 | 21° – 38° |
| February | 42° | 24° | 2.8" | 10.9" | 9 | 13 | 20° – 39° |
| March | 50° | 31° | 4.0" | 5.8" | 11 | 7 | 35° – 49° |
| April | 62° | 40° | 4.0" | 0.7" | 13 | 0 | 47° – 56° |
| May | 72° | 51° | 3.8" | 0.0" | 12 | 0 | 57° – 66° |
| June | 81° | 60° | 4.4" | 0.0" | 12 | 0 | 67° – 73° |
| July | 86° | 66° | 4.6" | 0.0" | 10 | 0 | 71° – 80° |
| August | 84° | 64° | 4.4" | 0.0" | 9 | 0 | 70° – 78° |
| September | 77° | 57° | 4.3" | 0.0" | 9 | 0 | 64° – 71° |
| October | 65° | 45° | 4.4" | 0.0" | 9 | 0 | 51° – 62° |
| November | 54° | 36° | 3.6" | 0.3" | 10 | 0 | 40° – 49° |
| December | 44° | 28° | 4.1" | 5.6" | 11 | 7 | 29° – 47° |
| Year | 63° | 44° | 47.6" | 32.7" | 124 | 39 |
How much a month can swing
A normal is an average. December swings the most: from 1991 to 2020 its average ranged from 29° to 47°. June is the most reliable, staying within 6°.
Where Old Tappan’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 Old Tappan’s center.
- Snow: Dobbs Ferry-ardsley, NY.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Dobbs Ferry-ardsley, NY, 8 miles from the town’s center, 130 ft higher; 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 Old Tappan’s climate
What is the weather like in Old Tappan?
A typical July afternoon reaches 86°, a January night drops to 22°, and about 33 inches of snow falls in a normal winter. Milder January nights than 53% of U.S. towns; hotter July afternoons than 58% of U.S. towns.
How cold does it get in Old Tappan in winter?
January nights average 22°. About 109 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 21°.
How much snow does Old Tappan 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 Old Tappan?
July, with a typical high of 86° and a low of 66°. About 19 days a year reach 90° (Dobbs Ferry-ardsley, NY).
When is the first and last frost in Old Tappan?
In half of years the last spring frost (32°) comes by April 20 and the first fall frost by October 26, about 189 frost-free days, at Dobbs Ferry-ardsley, NY.
What growing zone is Old Tappan in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 4°.
What is the best time of year to visit Old Tappan?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May, June, September and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Old Tappan getting warmer?
Yes: 1991–2020 averaged 2.2° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 95% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Old Tappan.
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.