January is one of the cooler months of the year in Mcdonough, with average highs near 10.9°C and lows around -0.1°C (mean 5.4°C). It is about average for rainfall, averaging 113 mm of rainfall and 83% relative humidity across the period.
January is one of the cooler months of the year in Mcdonough. Across 45 years of records, the warmest January in Mcdonough was 2017 — when the month averaged 9.4°C — while the coldest was 2014 at 1.6°C. Typical January days reach 10.9°C with nights near -0.1°C. The long-term trend is warming, about 0.5°C per decade.
January is about average for rainfall in Mcdonough, averaging 113 mm of rainfall. The wettest January on record was 2023 with 196 mm, while the driest was 1981 at 25 mm.
Relative humidity in Mcdonough during January averages 83%. The most humid January was 1998 at 90%, and the least humid was 1981 at 72%.
January receives about 2.7 kWh/m²/day of solar energy in Mcdonough. The sunniest January was 2018 at 3.1 kWh/m²/day, and the cloudiest was 1991 at 2.
Average wind speed in Mcdonough during January is 1.5 m/s. The windiest Januarys were 1985 and 1996 at 1.8 m/s, while the calmest were 1984, 1990 and 1991 at 1.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 3.7°C | 6.0°C | 6.0°C | 5.2°C | 6.2°C | +2.5°C |
| Avg High | 9.1°C | 11.3°C | 11.7°C | 10.8°C | 11.9°C | +2.8°C |
| Avg Low | -1.7°C | 0.7°C | 0.2°C | -0.3°C | 0.6°C | +2.3°C |
| Avg Rain | 94 mm | 142 mm | 90 mm | 110 mm | 139 mm | +45 mm |
January temperatures in Mcdonough have risen by about 2.8°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -19.3°C (1985) to a record high of 24.3°C (2022).
Rainfall in January is about average for rainfall, averaging 113 mm, with a wettest year of 196 mm.
A quieter season to visit Mcdonough
If your dates are flexible, the more temperate months of May and September tend to be the most comfortable for visiting Mcdonough. That said, January — with days averaging 10.9°C and nights around -0.1°C (mean 5.4°C) and higher rainfall (113 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 | 9.2°C | 3.2°C | -2.8°C | 19.4°C | -10.3°C | 70 mm | 77% | 1.5 m/s | 2.9 |
| 2024 | 11.1°C | 5.3°C | -0.4°C | 22.0°C | -9.6°C | 190 mm | 81% | 1.7 m/s | 2.9 |
| 2023 🌧️ | 14.8°C | 9.0°C | 3.3°C | 21.3°C | -5.2°C | 196 mm | 85% | 1.4 m/s | 2.6 |
| 2022 | 10.7°C | 5.0°C | -0.7°C | 24.3°C | -5.8°C | 89 mm | 80% | 1.6 m/s | 2.9 |
| 2021 | 12.0°C | 6.4°C | 0.8°C | 21.6°C | -4.1°C | 98 mm | 84% | 1.4 m/s | 2.5 |
| 2020 | 13.5°C | 8.5°C | 3.4°C | 22.8°C | -5.4°C | 192 mm | 86% | 1.5 m/s | 2.5 |
| 2019 | 11.6°C | 6.4°C | 1.1°C | 19.4°C | -5.7°C | 151 mm | 85% | 1.5 m/s | 2.6 |
| 2018 | 9.2°C | 3.3°C | -2.6°C | 18.7°C | -10.3°C | 77 mm | 75% | 1.6 m/s | 3.1 |
| 2017 🔥 | 14.9°C | 9.4°C | 3.9°C | 22.7°C | -13.6°C | 193 mm | 86% | 1.5 m/s | 2.7 |
| 2016 | 9.2°C | 4.2°C | -0.7°C | 17.5°C | -6.2°C | 105 mm | 86% | 1.5 m/s | 2.7 |
| 2015 | 10.4°C | 4.8°C | -0.8°C | 18.0°C | -9.4°C | 80 mm | 81% | 1.4 m/s | 2.7 |
| 2014 ❄️ | 7.6°C | 1.6°C | -4.4°C | 18.3°C | -12.4°C | 73 mm | 78% | 1.6 m/s | 3 |
| 2013 | 14.3°C | 8.7°C | 3.1°C | 22.7°C | -4.0°C | 121 mm | 85% | 1.4 m/s | 2.3 |
| 2012 | 14.3°C | 8.1°C | 2.0°C | 20.5°C | -5.7°C | 103 mm | 82% | 1.6 m/s | 2.7 |
| 2011 | 9.0°C | 3.4°C | -2.2°C | 19.3°C | -8.4°C | 65 mm | 81% | 1.5 m/s | 2.7 |
| 2010 | 7.5°C | 2.6°C | -2.3°C | 18.9°C | -10.8°C | 131 mm | 85% | 1.7 m/s | 2.8 |
| 2009 | 11.6°C | 5.7°C | -0.3°C | 21.7°C | -8.3°C | 81 mm | 82% | 1.5 m/s | 2.7 |
| 2008 | 10.0°C | 4.7°C | -0.7°C | 20.1°C | -10.5°C | 87 mm | 80% | 1.5 m/s | 3 |
| 2007 | 12.4°C | 6.7°C | 1.1°C | 21.2°C | -7.5°C | 103 mm | 82% | 1.5 m/s | 2.7 |
| 2006 | 14.8°C | 8.9°C | 3.0°C | 21.6°C | -4.4°C | 106 mm | 83% | 1.7 m/s | 2.7 |
| 2005 | 13.3°C | 7.6°C | 2.0°C | 21.1°C | -6.5°C | 50 mm | 84% | 1.5 m/s | 2.8 |
| 2004 | 11.2°C | 5.1°C | -1.1°C | 21.5°C | -7.8°C | 80 mm | 80% | 1.5 m/s | 2.8 |
| 2003 | 8.8°C | 3.5°C | -1.9°C | 17.3°C | -10.2°C | 50 mm | 80% | 1.6 m/s | 3 |
| 2002 | 13.9°C | 7.5°C | 1.0°C | 24.1°C | -7.1°C | 121 mm | 81% | 1.4 m/s | 2.8 |
| 2001 | 10.3°C | 4.5°C | -1.3°C | 20.9°C | -9.6°C | 86 mm | 82% | 1.4 m/s | 2.8 |
| 2000 | 10.9°C | 5.4°C | -0.1°C | 21.5°C | -6.9°C | 133 mm | 79% | 1.7 m/s | 2.6 |
| 1999 | 14.0°C | 7.7°C | 1.5°C | 22.3°C | -8.0°C | 145 mm | 81% | 1.6 m/s | 2.6 |
| 1998 | 11.9°C | 7.1°C | 2.4°C | 20.2°C | -5.8°C | 153 mm | 90% | 1.4 m/s | 2.5 |
| 1997 | 11.4°C | 6.1°C | 0.8°C | 21.4°C | -9.2°C | 144 mm | 82% | 1.7 m/s | 2.5 |
| 1996 | 10.7°C | 4.7°C | -1.3°C | 20.9°C | -6.9°C | 182 mm | 87% | 1.8 m/s | 2.4 |
| 1995 | 11.5°C | 5.8°C | 0.2°C | 18.8°C | -7.2°C | 96 mm | 84% | 1.6 m/s | 2.6 |
| 1994 | 7.8°C | 2.7°C | -2.5°C | 17.0°C | -15.2°C | 115 mm | 83% | 1.6 m/s | 2.5 |
| 1993 | 11.5°C | 6.8°C | 2.2°C | 16.4°C | -3.1°C | 121 mm | 89% | 1.4 m/s | 2.1 |
| 1992 | 10.7°C | 5.5°C | 0.4°C | 18.2°C | -8.0°C | 135 mm | 86% | 1.5 m/s | 2.6 |
| 1991 | 10.7°C | 6.1°C | 1.6°C | 18.8°C | -5.8°C | 160 mm | 87% | 1.3 m/s | 2 |
| 1990 | 12.9°C | 7.5°C | 2.0°C | 20.3°C | -5.2°C | 165 mm | 88% | 1.3 m/s | 2.7 |
| 1989 | 13.6°C | 7.8°C | 2.0°C | 20.7°C | -4.5°C | 63 mm | 81% | 1.4 m/s | 2.7 |
| 1988 | 7.8°C | 2.9°C | -2.0°C | 19.7°C | -7.6°C | 134 mm | 83% | 1.4 m/s | 2.6 |
| 1987 | 8.9°C | 4.0°C | -1.0°C | 18.6°C | -8.2°C | 148 mm | 88% | 1.5 m/s | 2.5 |
| 1986 | 10.2°C | 4.0°C | -2.3°C | 19.0°C | -13.9°C | 31 mm | 79% | 1.4 m/s | 2.9 |
| 1985 | 7.5°C | 2.1°C | -3.4°C | 19.6°C | -19.3°C | 111 mm | 79% | 1.8 m/s | 2.6 |
| 1984 | 8.6°C | 3.4°C | -1.8°C | 15.0°C | -9.0°C | 113 mm | 86% | 1.3 m/s | 2.7 |
| 1983 | 8.3°C | 3.7°C | -0.9°C | 16.5°C | -5.7°C | 93 mm | 88% | 1.4 m/s | — |
| 1982 | 8.5°C | 2.7°C | -3.1°C | 19.9°C | -17.9°C | 129 mm | 85% | 1.7 m/s | — |
| 1981 | 8.9°C | 2.9°C | -3.0°C | 18.0°C | -11.4°C | 25 mm | 72% | 1.5 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 10.9°C with lows near -0.1°C (mean 5.4°C), based on 45 years of NASA POWER data.
January averages 113 mm of rainfall in Mcdonough, about average for rainfall. The wettest on record was 196 mm in 2023.
The hottest January reached 24.3°C in 2022. The coldest dipped to -19.3°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 8.4°C to 11.6°C and overnight lows from -2.4°C to 0°C over the same span.
January is one of the cooler months of the year in Mcdonough and about average for rainfall, so plan for around 10.9°C daytime highs and -0.1°C at night.
Yes — January is the coldest month of the year in Mcdonough, averaging 5.4°C.
For January in Mcdonough, pack warm layers and a jacket for chilly mornings, with typical highs of 10.9°C and lows of -0.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 83% — quite humid.
Average wind speed in January is 1.5 m/s. The windiest January on record averaged 1.8 m/s (1985).
The wettest January on record was 2023 with 196 mm. On average, January sees 113 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 Mcdonough 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.
