March is one of the cooler months of the year in Decatur, with average highs near 10.8°C and lows around -0.7°C (mean 5.1°C). It is one of the drier months, averaging 72 mm of rainfall and 78% relative humidity across the period.
March is one of the cooler months of the year in Decatur. Across 45 years of records, the warmest March in Decatur was 2012 — when the month averaged 12.6°C — while the coldest was 1984 at 0.3°C. Typical March days reach 10.8°C with nights near -0.7°C. The long-term trend is warming, about 0.4°C per decade.
March is one of the drier months in Decatur, averaging 72 mm of rainfall. The wettest March on record was 1998 with 127 mm, while the driest was 1986 at 28 mm.
Relative humidity in Decatur during March averages 78%. The most humid March was 1993 at 86%, and the least humid was 1981 at 68%.
March receives about 3.7 kWh/m²/day of solar energy in Decatur. The sunniest Marchs were 2012 and 2024 at 4.3 kWh/m²/day, and the cloudiest was 1993 at 2.8.
Average wind speed in Decatur during March is 4 m/s. The windiest March was 1991 at 5 m/s, while the calmest was 2010 at 3.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 4.3°C | 4.5°C | 5.3°C | 5.0°C | 6.7°C | +2.4°C |
| Avg High | 10.1°C | 10.1°C | 11.1°C | 10.6°C | 12.7°C | +2.6°C |
| Avg Low | -1.5°C | -1.1°C | -0.6°C | -0.5°C | 0.7°C | +2.2°C |
| Avg Rain | 69 mm | 71 mm | 70 mm | 66 mm | 93 mm | +24 mm |
March temperatures in Decatur have risen by about 2.9°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -20.6°C (2002) to a record high of 27.4°C (1981).
Rainfall in March is one of the drier months, averaging 72 mm, with a wettest year of 127 mm.
A quieter season to visit Decatur
If your dates are flexible, the more temperate months of June and August tend to be the most comfortable for visiting Decatur. That said, March — with days averaging 10.8°C and nights around -0.7°C (mean 5.1°C) and moderate rainfall (72 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 | 14.7°C | 8.2°C | 1.6°C | 26.1°C | -5.9°C | 76 mm | 70% | 4.5 m/s | 4.1 |
| 2024 | 14.5°C | 8.0°C | 1.5°C | 23.2°C | -5.4°C | 52 mm | 74% | 4.3 m/s | 4.3 |
| 2023 | 10.3°C | 4.7°C | -0.9°C | 21.5°C | -9.3°C | 115 mm | 77% | 4.3 m/s | 3.5 |
| 2022 | 11.4°C | 5.6°C | -0.3°C | 21.5°C | -11.1°C | 123 mm | 78% | 4.2 m/s | 3.8 |
| 2021 | 13.4°C | 7.2°C | 0.9°C | 21.6°C | -5.7°C | 101 mm | 76% | 4.1 m/s | 4 |
| 2020 | 11.9°C | 6.6°C | 1.2°C | 21.5°C | -4.7°C | 90 mm | 83% | 3.8 m/s | 3.1 |
| 2019 | 8.1°C | 2.6°C | -2.9°C | 19.6°C | -16.9°C | 117 mm | 79% | 3.9 m/s | 3.6 |
| 2018 | 8.1°C | 2.9°C | -2.3°C | 14.6°C | -6.2°C | 88 mm | 77% | 3.8 m/s | 3.5 |
| 2017 | 11.3°C | 6.0°C | 0.6°C | 24.5°C | -8.1°C | 65 mm | 74% | 4.2 m/s | 3.6 |
| 2016 | 13.9°C | 8.3°C | 2.8°C | 22.1°C | -6.8°C | 89 mm | 82% | 3.9 m/s | 3.7 |
| 2015 | 9.5°C | 3.7°C | -2.1°C | 23.3°C | -15.5°C | 50 mm | 78% | 3.3 m/s | 3.9 |
| 2014 | 7.8°C | 1.8°C | -4.3°C | 19.5°C | -17.6°C | 42 mm | 75% | 3.9 m/s | 4.1 |
| 2013 | 5.9°C | 1.2°C | -3.5°C | 16.1°C | -10.8°C | 59 mm | 78% | 3.6 m/s | 3.4 |
| 2012 🔥 | 18.7°C | 12.6°C | 6.6°C | 26.8°C | -5.9°C | 38 mm | 77% | 4.3 m/s | 4.3 |
| 2011 | 10.9°C | 5.2°C | -0.6°C | 23.8°C | -5.5°C | 44 mm | 78% | 3.8 m/s | 3.3 |
| 2010 | 11.4°C | 6.0°C | 0.6°C | 23.4°C | -4.5°C | 68 mm | 86% | 3.2 m/s | 3.6 |
| 2009 | 12.0°C | 5.9°C | -0.3°C | 21.6°C | -11.6°C | 98 mm | 78% | 4 m/s | 4.1 |
| 2008 | 9.3°C | 3.6°C | -2.1°C | 20.0°C | -12.5°C | 86 mm | 82% | 3.9 m/s | 3.3 |
| 2007 | 14.4°C | 8.9°C | 3.3°C | 25.4°C | -6.3°C | 86 mm | 81% | 4.1 m/s | 3.9 |
| 2006 | 10.9°C | 5.1°C | -0.7°C | 23.1°C | -7.2°C | 87 mm | 78% | 4.1 m/s | 3.5 |
| 2005 | 8.7°C | 3.6°C | -1.5°C | 21.8°C | -9.2°C | 32 mm | 79% | 3.8 m/s | 3.9 |
| 2004 | 12.3°C | 6.5°C | 0.7°C | 23.8°C | -7.1°C | 108 mm | 77% | 4.3 m/s | 3.7 |
| 2003 | 12.3°C | 5.7°C | -0.9°C | 23.7°C | -11.8°C | 54 mm | 74% | 3.7 m/s | 4 |
| 2002 | 8.7°C | 2.9°C | -2.8°C | 18.4°C | -20.6°C | 69 mm | 80% | 4.2 m/s | 3.3 |
| 2001 | 8.0°C | 2.6°C | -2.8°C | 14.9°C | -7.0°C | 34 mm | 78% | 3.4 m/s | 3.8 |
| 2000 | 14.5°C | 7.9°C | 1.3°C | 25.6°C | -6.0°C | 50 mm | 69% | 3.6 m/s | 3.8 |
| 1999 | 9.2°C | 3.3°C | -2.6°C | 19.9°C | -7.3°C | 38 mm | 74% | 3.6 m/s | 4.2 |
| 1998 🌧️ | 9.1°C | 4.3°C | -0.5°C | 25.3°C | -16.3°C | 127 mm | 81% | 4.5 m/s | 3.5 |
| 1997 | 11.6°C | 5.5°C | -0.7°C | 25.5°C | -7.7°C | 64 mm | 76% | 4.3 m/s | 3.8 |
| 1996 | 7.7°C | 1.8°C | -4.2°C | 21.1°C | -14.7°C | 70 mm | 70% | 4.3 m/s | 3.6 |
| 1995 | 11.8°C | 5.9°C | 0.0°C | 22.3°C | -10.0°C | 78 mm | 76% | 3.5 m/s | 3.9 |
| 1994 | 9.4°C | 3.9°C | -1.7°C | 21.4°C | -6.8°C | 33 mm | 81% | 3.7 m/s | 3.9 |
| 1993 | 7.4°C | 2.6°C | -2.2°C | 20.9°C | -12.5°C | 83 mm | 86% | 3.7 m/s | 2.8 |
| 1992 | 10.8°C | 5.3°C | -0.1°C | 22.1°C | -7.0°C | 63 mm | 79% | 3.9 m/s | 3.3 |
| 1991 | 11.5°C | 5.8°C | 0.0°C | 25.0°C | -6.0°C | 86 mm | 80% | 5 m/s | 3.6 |
| 1990 | 12.1°C | 6.7°C | 1.2°C | 25.0°C | -6.4°C | 69 mm | 76% | 3.9 m/s | 3.7 |
| 1989 | 10.5°C | 4.5°C | -1.5°C | 23.5°C | -11.0°C | 45 mm | 77% | 4 m/s | 3.2 |
| 1988 | 9.6°C | 3.8°C | -2.0°C | 21.3°C | -7.8°C | 73 mm | 78% | 4.3 m/s | 3.7 |
| 1987 | 11.8°C | 6.1°C | 0.3°C | 20.8°C | -7.2°C | 32 mm | 76% | 4.1 m/s | 3.8 |
| 1986 | 11.5°C | 5.2°C | -1.1°C | 25.6°C | -11.0°C | 28 mm | 78% | 4.4 m/s | 3.9 |
| 1985 | 11.6°C | 5.6°C | -0.4°C | 24.6°C | -5.8°C | 119 mm | 81% | 4.5 m/s | 3.6 |
| 1984 ❄️ | 5.0°C | 0.3°C | -4.5°C | 15.9°C | -11.0°C | 107 mm | 84% | 3.9 m/s | 2.9 |
| 1983 | 10.2°C | 5.1°C | 0.1°C | 19.9°C | -6.6°C | 93 mm | 82% | 3.9 m/s | — |
| 1982 | 9.4°C | 3.5°C | -2.4°C | 20.1°C | -13.5°C | 95 mm | 82% | 4.1 m/s | — |
| 1981 | 11.1°C | 4.7°C | -1.8°C | 27.4°C | -6.5°C | 32 mm | 68% | 3.8 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 10.8°C with lows near -0.7°C (mean 5.1°C), based on 45 years of NASA POWER data.
March averages 72 mm of rainfall in Decatur, one of the drier months. The wettest on record was 127 mm in 1998.
The hottest March reached 27.4°C in 1981. The coldest dipped to -20.6°C in 2002.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 2.9°C. Daytime highs moved from 9.5°C to 12.9°C and overnight lows from -1.8°C to 0.6°C over the same span.
March is one of the cooler months of the year in Decatur and one of the drier months, so plan for around 10.8°C daytime highs and -0.7°C at night.
Not quite — March is the 4th coolest month in Decatur, averaging 5.1°C.
For March in Decatur, pack warm layers and a jacket for chilly mornings, with typical highs of 10.8°C and lows of -0.7°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 78% — quite humid.
Average wind speed in March is 4 m/s. The windiest March on record averaged 5 m/s (1991).
The wettest March on record was 1998 with 127 mm. On average, March sees 72 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 Decatur behaves each March, 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 March specifically, along with year-by-year records and how the month has changed over the decades.
