Photo: Redjockey · CC BY 3.0More precipitation falls on Parsippany-Troy Hills Township than on 79% of U.S. towns: 49 inches a year
The coldest hours of a January night bottom out at 21° on average. Warming shows here too: 2.0° more than in 1901–2000, led by December. Plan time outside from May to June and August to October, when highs sit at 65–84°.
A year in Parsippany-Troy Hills Township at a glance
Each month’s typical high and low, and what it brings.
What stands out about Parsippany-Troy Hills Township’s climate
Compared with towns across the U.S., with Parsippany-Troy Hills Township’s place in New Jersey beside it.
What a year in Parsippany-Troy Hills Township 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 17 and the first by October 23. Frost and day counts come from NOAA’s station at Boonton 1 Se, NJ, 2.6 miles from the city’s center point, at about the same height.
The 2023 USDA map puts Parsippany-Troy Hills Township’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 1°. 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 24 inches of snow a winter
Snow, measured at Canoe Brook, NJ, falls mostly in February. Precipitation (rain plus melted snow) adds up to 49 inches a year; July is the wettest month and February the driest. Rain or snow falls on about 123 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Parsippany-Troy Hills Township
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 Boonton 1 Se, NJ.
Living with Parsippany-Troy Hills Township’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 17 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. 43 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Parsippany-Troy Hills Township from natural hazards, river flooding is the largest share (76%); heat waves, cold waves, winter storms and ice storms together are 11%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Parsippany-Troy Hills Township and its neighbors
Every town next door is within a degree of Parsippany-Troy Hills Township in January and July, closer than the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Parsippany-Troy Hills Township’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 |
|---|---|---|---|---|
| Parsippany-Troy Hills Township, NJ | 21° | 86° | 49" | 24" |
| Clarksburg, WV | 23° | 85° | 47" | 24" |
| Elsmere, KY | 23° | 85° | 47" | 23" |
| Bloomington, IN | 21° | 85° | 47" | 18" |
| Delhi Hills, OH | 23° | 86° | 46" | 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 Parsippany-Troy Hills Township averaged 2.0° warmer than the 1900s. The biggest change is in December (+3.5°).
A bigger shift than in 91% 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 Parsippany-Troy Hills Township compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Parsippany-Troy Hills Township’s place among New Jersey’s.
Parsippany-Troy Hills Township weather by month
Highs, lows and precipitation from NOAA’s grid at Parsippany-Troy Hills Township’s center; snow, wet days and snow on the ground from Canoe Brook, NJ. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 38° | 21° | 3.5" | 5.8" | 10 | 8 | 21° – 36° |
| February | 41° | 22° | 2.7" | 8.4" | 8 | 8 | 20° – 38° |
| March | 50° | 29° | 4.0" | 4.6" | 10 | 5 | 33° – 49° |
| April | 62° | 39° | 4.0" | 0.4" | 12 | 0 | 46° – 55° |
| May | 72° | 48° | 4.1" | 0.0" | 12 | 0 | 56° – 65° |
| June | 81° | 58° | 4.6" | 0.0" | 11 | 0 | 66° – 72° |
| July | 86° | 63° | 4.7" | 0.0" | 11 | 0 | 70° – 78° |
| August | 84° | 61° | 4.4" | 0.0" | 11 | 0 | 69° – 76° |
| September | 77° | 54° | 4.5" | 0.0" | 10 | 0 | 63° – 69° |
| October | 65° | 42° | 4.5" | 0.0" | 11 | 0 | 49° – 60° |
| November | 53° | 33° | 3.5" | 0.7" | 9 | 0 | 39° – 48° |
| December | 43° | 26° | 4.3" | 4.1" | 10 | 4 | 28° – 45° |
| Year | 63° | 41° | 48.7" | 24.0" | 123 | 24 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 20° to 38°. June is the most reliable, staying within 6°.
Where Parsippany-Troy Hills Township’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 Parsippany-Troy Hills Township’s center.
- Snow: Canoe Brook, NJ.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Boonton 1 Se, NJ, 2.6 miles from the city’s center point, 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 Parsippany-Troy Hills Township’s climate
What is the weather like in Parsippany-Troy Hills Township?
A typical July afternoon reaches 86°, a January night drops to 21°, and about 24 inches of snow falls in a normal winter. Colder January nights than 56% of U.S. towns; hotter July afternoons than 54% of U.S. towns.
How cold does it get in Parsippany-Troy Hills Township in winter?
January nights average 21°. About 124 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 21°.
How much snow does Parsippany-Troy Hills Township get?
About 24 inches in a normal winter at Canoe Brook, NJ, most of it in February, with snow on the ground about 24 days a year.
How hot does it get in Parsippany-Troy Hills Township?
July, with a typical high of 86° and a low of 63°. About 16 days a year reach 90° (Boonton 1 Se, NJ).
When is the first and last frost in Parsippany-Troy Hills Township?
In half of years the last spring frost (32°) comes by April 17 and the first fall frost by October 23, about 189 frost-free days, at Boonton 1 Se, NJ.
What growing zone is Parsippany-Troy Hills Township in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 1°.
What is the best time of year to visit Parsippany-Troy Hills Township?
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 Parsippany-Troy Hills Township getting warmer?
Yes: 1991–2020 averaged 2.0° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 91% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Parsippany-Troy Hills Township.
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.