Climate averages 1991–2020
Edison weather
in December.
A cold, wet month: the 10th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Edison: daytime highs average 6.3°C and nights cool to about -0.8°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 102 mm of rain on roughly 9 days, which makes December a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 20 min on an average December day.
The nearest other city in this atlas is Staten Island (24 km away). In December its highs average 6.4°C, about as warm as Edison, with 100 mm of rain.
Among the 498 cities listed in the United States, Edison ranks joint 321st of 498 for the warmest December highs and joint 389th of 498 for the driest December (rainfall, lowest first). The mean December high of those 498 cities is 10.5°C; Edison is 4.2°C cooler than that mean.
From December to January, average highs fall by 2.6°C to 3.7°C, and monthly rainfall falls from 102 mm to 83 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Edison climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.7°C-4.1°C | -4.1°C | 83 | 9.2 | 9.610 h |
| February | 5.2°C-3.6°C | -3.6°C | 78 | 8.6 | 10.611 h |
| March | 9.7°C0.2°C | 0.2°C | 108 | 10.5 | 11.912 h |
| April | 16.0°C6.0°C | 6.0°C | 93 | 10.7 | 13.313 h |
| May | 21.4°C11.6°C | 11.6°C | 90 | 11.4 | 14.414 h |
| June | 26.4°C17.0°C | 17.0°C | 106 | 11.2 | 15.015 h |
| July | 29.4°C20.2°C | 20.2°C | 108 | 11.2 | 14.815 h |
| August | 28.2°C19.5°C | 19.5°C | 103 | 10.2 | 13.814 h |
| September | 24.3°C15.9°C | 15.9°C | 101 | 9.1 | 12.513 h |
| October | 17.8°C9.7°C | 9.7°C | 95 | 8.6 | 11.211 h |
| November | 11.7°C3.9°C | 3.9°C | 76 | 7.8 | 10.010 h |
| December, selected | 6.3°C-0.8°C | -0.8°C | 102 | 9.4 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Staten Island in DecemberUnited States · 24 kmHigh 6.4°C · Low -0.7°C · 100 mm rain
- Newark in DecemberUnited States · 31 kmHigh 6.1°C · Low -1.4°C · 103 mm rain
- New York City in DecemberUnited States · 41 kmHigh 5.8°C · Low -1.4°C · 100 mm rain
- Brooklyn in DecemberUnited States · 42 kmHigh 6.1°C · Low -0.9°C · 100 mm rain
- Trenton in DecemberUnited States · 44 kmHigh 6.7°C · Low -0.9°C · 102 mm rain
- Passaic in DecemberUnited States · 45 kmHigh 5.6°C · Low -1.4°C · 103 mm rain
- Manhattan in DecemberUnited States · 48 kmHigh 5.7°C · Low -1.4°C · 100 mm rain
- Paterson in DecemberUnited States · 49 kmHigh 5.6°C · Low -1.4°C · 105 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Edison) is explained once on the Edison year overview and on the Sources, method and limits page.