January is one of the cooler months of the year in Morristown, with average highs near 6.6°C and lows around -3.2°C (mean 1.7°C). It is about average for rainfall, averaging 104 mm of rainfall and 83% relative humidity across the period.
January is one of the cooler months of the year in Morristown. Across 45 years of records, the warmest January in Morristown was 2017 — when the month averaged 6.4°C — while the coldest was 1985 at -2.3°C. Typical January days reach 6.6°C with nights near -3.2°C. The long-term trend is warming, about 0.4°C per decade.
January is about average for rainfall in Morristown, averaging 104 mm of rainfall. The wettest January on record was 2013 with 247 mm, while the driest was 1986 at 30 mm.
Relative humidity in Morristown during January averages 83%. The most humid January was 1996 at 88%, and the least humid was 2014 at 78%.
January receives about 2.2 kWh/m²/day of solar energy in Morristown. The sunniest January was 2014 at 2.6 kWh/m²/day, and the cloudiest were 1993, 1996 and 2017, among others at 1.9.
Average wind speed in Morristown during January is 0.8 m/s. The windiest January was 1982 at 1 m/s, while the calmest was 1998 at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 0.0°C | 2.4°C | 2.2°C | 1.5°C | 2.5°C | +2.5°C |
| Avg High | 4.9°C | 7.3°C | 7.2°C | 6.2°C | 7.3°C | +2.4°C |
| Avg Low | -4.9°C | -2.5°C | -2.8°C | -3.3°C | -2.3°C | +2.6°C |
| Avg Rain | 86 mm | 127 mm | 96 mm | 101 mm | 116 mm | +30 mm |
January temperatures in Morristown have risen by about 2.8°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -23.7°C (1985) to a record high of 22.2°C (2022).
Rainfall in January is about average for rainfall, averaging 104 mm, with a wettest year of 247 mm.
A quieter season to visit Morristown
If your dates are flexible, the more temperate months of June and September tend to be the most comfortable for visiting Morristown. That said, January — with days averaging 6.6°C and nights around -3.2°C (mean 1.7°C) and higher rainfall (104 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 4.2°C | -1.0°C | -6.1°C | 15.1°C | -14.5°C | 60 mm | 78% | 0.8 m/s | 2.3 |
| 2024 | 6.6°C | 1.6°C | -3.5°C | 19.1°C | -16.4°C | 149 mm | 84% | 0.9 m/s | 2.1 |
| 2023 | 10.7°C | 5.9°C | 1.1°C | 18.5°C | -6.1°C | 143 mm | 85% | 0.8 m/s | 2 |
| 2022 | 6.1°C | 1.0°C | -4.0°C | 22.2°C | -9.3°C | 109 mm | 82% | 0.8 m/s | 2.3 |
| 2021 | 7.1°C | 2.5°C | -2.1°C | 15.0°C | -6.7°C | 86 mm | 86% | 0.7 m/s | 2.1 |
| 2020 | 9.3°C | 4.9°C | 0.5°C | 20.3°C | -9.4°C | 149 mm | 85% | 0.8 m/s | 2 |
| 2019 | 6.8°C | 2.3°C | -2.1°C | 15.5°C | -11.3°C | 110 mm | 85% | 0.8 m/s | 2.2 |
| 2018 | 5.1°C | -0.2°C | -5.6°C | 16.8°C | -15.4°C | 56 mm | 79% | 0.8 m/s | 2.3 |
| 2017 🔥 | 10.6°C | 6.4°C | 2.2°C | 18.3°C | -12.6°C | 98 mm | 84% | 0.8 m/s | 1.9 |
| 2016 | 4.9°C | 0.2°C | -4.5°C | 14.7°C | -12.8°C | 63 mm | 83% | 0.7 m/s | 2.4 |
| 2015 | 5.9°C | 1.0°C | -3.8°C | 14.6°C | -16.4°C | 70 mm | 81% | 0.7 m/s | 2.3 |
| 2014 | 3.3°C | -2.1°C | -7.5°C | 12.6°C | -18.7°C | 61 mm | 78% | 0.9 m/s | 2.6 |
| 2013 🌧️ | 8.8°C | 4.0°C | -0.9°C | 21.7°C | -8.5°C | 247 mm | 87% | 0.7 m/s | 2 |
| 2012 | 9.6°C | 4.3°C | -1.0°C | 16.6°C | -8.2°C | 123 mm | 84% | 0.9 m/s | 2.1 |
| 2011 | 4.3°C | -0.2°C | -4.7°C | 15.9°C | -13.5°C | 60 mm | 85% | 0.7 m/s | 2.2 |
| 2010 | 2.9°C | -1.0°C | -5.0°C | 13.3°C | -12.8°C | 121 mm | 84% | 0.8 m/s | 2 |
| 2009 | 6.3°C | 1.1°C | -4.0°C | 17.5°C | -16.5°C | 127 mm | 84% | 0.7 m/s | 2.1 |
| 2008 | 6.9°C | 1.6°C | -3.7°C | 19.2°C | -13.5°C | 80 mm | 78% | 0.8 m/s | 2.3 |
| 2007 | 8.5°C | 3.5°C | -1.5°C | 20.5°C | -10.9°C | 61 mm | 80% | 0.8 m/s | 2.3 |
| 2006 | 10.9°C | 5.5°C | 0.1°C | 17.8°C | -5.9°C | 123 mm | 83% | 0.9 m/s | 2.2 |
| 2005 | 8.9°C | 4.1°C | -0.8°C | 18.5°C | -12.9°C | 75 mm | 85% | 0.8 m/s | 2 |
| 2004 | 6.1°C | 1.2°C | -3.7°C | 19.5°C | -11.1°C | 70 mm | 80% | 0.8 m/s | 2.3 |
| 2003 | 3.6°C | -0.7°C | -5.1°C | 12.9°C | -14.9°C | 58 mm | 80% | 0.8 m/s | 2.2 |
| 2002 | 9.1°C | 3.8°C | -1.6°C | 20.9°C | -10.4°C | 159 mm | 81% | 0.7 m/s | 2.5 |
| 2001 | 5.5°C | 0.8°C | -4.0°C | 14.5°C | -10.7°C | 90 mm | 81% | 0.7 m/s | 2.2 |
| 2000 | 6.2°C | 1.2°C | -3.8°C | 19.5°C | -14.3°C | 112 mm | 79% | 0.9 m/s | 2.3 |
| 1999 | 9.0°C | 4.0°C | -1.0°C | 18.8°C | -11.5°C | 164 mm | 84% | 0.9 m/s | 2.1 |
| 1998 | 8.7°C | 4.3°C | -0.2°C | 18.9°C | -10.7°C | 152 mm | 88% | 0.6 m/s | 2 |
| 1997 | 6.6°C | 1.4°C | -3.8°C | 18.6°C | -17.2°C | 100 mm | 83% | 0.9 m/s | 2.2 |
| 1996 | 5.6°C | 0.4°C | -4.9°C | 15.7°C | -17.4°C | 180 mm | 88% | 0.8 m/s | 1.9 |
| 1995 | 7.4°C | 2.7°C | -2.1°C | 17.7°C | -13.9°C | 137 mm | 81% | 0.8 m/s | 2 |
| 1994 | 3.1°C | -1.6°C | -6.2°C | 15.8°C | -23.6°C | 142 mm | 88% | 0.8 m/s | 2.1 |
| 1993 | 9.0°C | 4.0°C | -1.1°C | 15.5°C | -6.0°C | 97 mm | 85% | 0.7 m/s | 1.9 |
| 1992 | 7.2°C | 2.2°C | -2.8°C | 14.5°C | -12.5°C | 92 mm | 84% | 0.8 m/s | 2.3 |
| 1991 | 7.3°C | 2.9°C | -1.6°C | 13.4°C | -8.8°C | 78 mm | 88% | 0.7 m/s | 1.9 |
| 1990 | 9.2°C | 4.1°C | -1.0°C | 17.1°C | -6.3°C | 124 mm | 87% | 0.7 m/s | 2.1 |
| 1989 | 10.0°C | 4.7°C | -0.7°C | 18.1°C | -5.8°C | 127 mm | 80% | 0.8 m/s | 2.3 |
| 1988 | 3.5°C | -1.2°C | -5.9°C | 14.4°C | -14.2°C | 94 mm | 83% | 0.7 m/s | 2.3 |
| 1987 | 5.0°C | 0.7°C | -3.6°C | 13.2°C | -14.5°C | 110 mm | 87% | 0.7 m/s | 2.1 |
| 1986 | 5.6°C | 0.2°C | -5.2°C | 15.1°C | -17.5°C | 30 mm | 78% | 0.8 m/s | 2.4 |
| 1985 ❄️ | 2.3°C | -2.3°C | -6.9°C | 18.1°C | -23.7°C | 100 mm | 83% | 0.9 m/s | 2.1 |
| 1984 | 4.6°C | -0.2°C | -5.0°C | 13.5°C | -16.8°C | 61 mm | 84% | 0.7 m/s | 2.3 |
| 1983 | 5.6°C | 1.1°C | -3.5°C | 13.4°C | -13.2°C | 58 mm | 85% | 0.7 m/s | — |
| 1982 | 4.2°C | -1.1°C | -6.4°C | 15.0°C | -22.2°C | 160 mm | 83% | 1 m/s | — |
| 1981 | 3.5°C | -1.5°C | -6.6°C | 13.5°C | -15.6°C | 34 mm | 78% | 0.7 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 6.6°C with lows near -3.2°C (mean 1.7°C), based on 45 years of NASA POWER data.
January averages 104 mm of rainfall in Morristown, about average for rainfall. The wettest on record was 247 mm in 2013.
The hottest January reached 22.2°C in 2022. The coldest dipped to -23.7°C in 1985.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 2.8°C. Daytime highs moved from 4°C to 6.9°C and overnight lows from -5.7°C to -2.9°C over the same span.
January is one of the cooler months of the year in Morristown and about average for rainfall, so plan for around 6.6°C daytime highs and -3.2°C at night.
Yes — January is the coldest month of the year in Morristown, averaging 1.7°C.
For January in Morristown, pack warm layers and a jacket for chilly mornings, with typical highs of 6.6°C and lows of -3.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 83% — quite humid.
Average wind speed in January is 0.8 m/s. The windiest January on record averaged 1 m/s (1982).
The wettest January on record was 2013 with 247 mm. On average, January sees 104 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Morristown behaves each January, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for January specifically, along with year-by-year records and how the month has changed over the decades.
