Mount Arlington, NJ climate
Mount Arlington has chilly winters and pleasant summers, with plenty of rain. A typical July afternoon reaches 82°, a January night drops to 18°, and about 28 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Mount Arlington feels like
Winter
Spring
Summer
Fall
Mount Arlington weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | 30-yr range |
|---|---|---|---|---|---|---|
| January | 35° | 18° | 3.7" | 9.6" | 11 | 18° – 34° |
| February | 39° | 20° | 2.9" | 7.7" | 9 | 17° – 35° |
| March | 47° | 27° | 4.2" | 5.3" | 11 | 30° – 46° |
| April | 60° | 37° | 4.1" | 1.4" | 10 | 44° – 53° |
| May | 70° | 47° | 4.2" | 0 | 11 | 53° – 63° |
| June | 77° | 56° | 4.8" | 0 | 11 | 63° – 69° |
| July | 82° | 61° | 4.9" | 0 | 9 | 67° – 75° |
| August | 81° | 59° | 4.6" | 0 | 9 | 66° – 73° |
| September | 74° | 52° | 4.6" | 0 | 8 | 60° – 67° |
| October | 62° | 41° | 4.8" | 0 | 8 | 47° – 59° |
| November | 51° | 32° | 3.7" | 0.2" | 8 | 37° – 46° |
| December | 40° | 24° | 4.5" | 3.9" | 11 | 25° – 42° |
| Year | 60° | 40° | 50.9" | 28.1" | 115 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Mount Arlington
Mount Arlington gets 51 inches of rain and melted snow a year. July is the wettest month and February the driest. Rain or snow falls on about 115 days a year.
About 175 frost-free days a year
In half of years the last 32° night comes by April 25 and the first one by October 19. That leaves about 175 frost-free days for gardens, shorter than 54% of U.S. towns.
Heating and cooling a home in Mount Arlington
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Mount Arlington, 90% of that work is heating and 10% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Mount Arlington and its neighbors
Mount Arlington borders 3 towns with climate data. January nights across them vary by 0.6°. Hopatcong has the coldest January nights (18°) and Roxbury the hottest July afternoons (83°). Mount Arlington’s January low is 18° and its July high 82°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Mount Arlington compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Mount Arlington averaged 1.9° warmer than the 1900s. The biggest change is in December (+3.6°). The shift is larger than in 92% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Mount Arlington’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. February swings the most: between 1991 and 2020 its average temperature ranged from 17° to 35°. June is the most reliable, staying within 6°.
Common questions about Mount Arlington’s climate
What is the coldest month in Mount Arlington?
January, with a typical high of 35° and a low of 18°.
What is the hottest month in Mount Arlington?
July, with a typical high of 82° and a low of 61°. About 11 days a year reach 90°.
How much snow does Mount Arlington get?
About 28 inches in a normal winter, most of it in January.
When is the first frost in Mount Arlington?
In half of years the first 32° night comes by October 19, and the last spring frost by April 25.
What is the rainiest month in Mount Arlington?
July, with 4.9 inches of rain and melted snow. The year totals 51 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Mount Arlington itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Oak Ridge Rsvr, NJ (11 mi, snow) and Andover Aeroflex Airport, NJ (8 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.