TODAY OCT23
TEMPERATURE64
HUMIDITY39
PRESSURE29.9
WIND COND.240 11.4
  • 5236Wed
  • 4835Thu
  • 4838Fri40%
  • 4839Sat60%60%
  • 5140Sun60%40%
daynightWeather update from Morristown Municipal at
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Mountainside Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January26°F42°F34°F6.3"
February24°F42°F32°F4.9"
March31°F50°F40°F7.3"
April46°F67°F55°F5.0"
May56°F76°F65°F9.9"
June64°F83°F73°F8.3"
July71°F87°F78°F8.3"
August67°F84°F75°F7.8"
September61°F80°F70°F4.9"
October54°F72°F62°F6.3"
November38°F56°F46°F5.9"
December33°F46°F39°F5.8"

Did you know?

  • The highest monthly average temperature in Mountainside for July is 78 degrees.
  • The lowest monthly average temperature in Mountainside for February is 32 degrees.
  • The most monthly precipitation in Mountainside occurs in May with 9.9 inches.
  • The air quality index in Mountainside is 6% worse than the national average.
  • The pollution index in Mountainside is 153% worse than the national average.

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Compare Mountainside, NJ Weather To Other Cities

Mountainside air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexMountainsideNew JerseyNational
Air quality index534550
Pollution index12,837,2007,146,1325,066,862

Mountainside air quality information

MeasurementTotal
Days measured365
Days with good air quality161
Days with moderate air quality189
Days w/ poor A.Q. for sensitive groups15
Days with unhealthy air quality

Mountainside air quality information

PollutantTotal
Arsenic0.010%
Benzene0.110%
Carbon Tetrachloride0.050%
Lead0.020%
Mercury0.230%

Average monthly Mountainside temperature with heat index

Mountainside monthly precipitation with daily maximum

Mountainside monthly snow depth with daily maximum

Mountainside monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Mendham, NJ5,0123922%
Wharton, NJ6,5863922%
Dover, NJ18,3173922%
Kenvil, NJ3,1263922%
Victory Gardens, NJ1,6233922%
Mountainside, NJ6,835536%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
West Samoset, FL6,8363824%
Greenville, IL6,8333922%
Milford, OH6,833548%
Maple Glen, PA6,8375714%
Sullivan, MO6,8386020%
Mountainside, NJ6,835536%
Source: The Mountainside, NJ weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.