March is one of the cooler months of the year in Duncan, with average highs near 9°C and lows around 3.3°C (mean 6.2°C). It is a relatively wet time of year, averaging 95 mm of rainfall and 83% relative humidity across the period.
March is one of the cooler months of the year in Duncan. Across 45 years of records, the warmest March in Duncan was 1992 — when the month averaged 9.4°C — while the coldest was 2002 at 3.7°C. Typical March days reach 9°C with nights near 3.3°C. The long-term March temperature trend is broadly flat.
March is a relatively wet time of year in Duncan, averaging 95 mm of rainfall. The wettest March on record was 1997 with 165 mm, while the driest was 2019 at 23 mm.
Relative humidity in Duncan during March averages 83%. The most humid March was 2025 at 91%, and the least humid was 2019 at 76%.
March receives about 3 kWh/m²/day of solar energy in Duncan. The sunniest March was 2019 at 3.9 kWh/m²/day, and the cloudiest was 2017 at 2.4.
Average wind speed in Duncan during March is 1.6 m/s. The windiest March was 1997 at 2.1 m/s, while the calmest was 1992 at 1.1 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 6.3°C | 6.4°C | 5.7°C | 6.3°C | 5.9°C | -0.4°C |
| Avg High | 9.2°C | 9.4°C | 8.5°C | 9.0°C | 8.6°C | -0.6°C |
| Avg Low | 3.4°C | 3.5°C | 3.0°C | 3.6°C | 3.2°C | -0.2°C |
| Avg Rain | 119 mm | 91 mm | 91 mm | 96 mm | 69 mm | -50 mm |
March temperatures in Duncan have fallen by about 0.5°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -5.3°C (2002) to a record high of 19.3°C (2016).
Rainfall in March is a relatively wet time of year, averaging 95 mm, with a wettest year of 165 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0°C per decade, narrowing the gap between day and night.
A good time to visit Duncan
March is a good time to visit Duncan, with days averaging 9°C and nights around 3.3°C (mean 6.2°C, cooler than Duncan's yearly average) and higher rainfall. August and July are marginally more temperate, but March still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 8.4°C | 6.1°C | 3.8°C | 12.2°C | 0.4°C | 129 mm | 91% | 1.7 m/s | 2.6 |
| 2024 | 9.3°C | 6.5°C | 3.7°C | 17.9°C | -0.3°C | 80 mm | 85% | 1.5 m/s | 3.1 |
| 2023 | 7.9°C | 5.3°C | 2.7°C | 13.5°C | 0.7°C | 48 mm | 84% | 1.7 m/s | 3.1 |
| 2022 | 9.2°C | 6.5°C | 3.8°C | 12.6°C | -0.1°C | 78 mm | 86% | 1.4 m/s | 2.9 |
| 2021 | 8.6°C | 5.8°C | 2.9°C | 10.8°C | 0.0°C | 45 mm | 81% | 1.7 m/s | 3.3 |
| 2020 | 7.9°C | 5.0°C | 2.1°C | 13.2°C | -3.2°C | 34 mm | 80% | 1.7 m/s | 3.3 |
| 2019 | 10.0°C | 6.7°C | 3.4°C | 17.1°C | -1.6°C | 23 mm | 76% | 1.3 m/s | 3.9 |
| 2018 | 8.8°C | 5.9°C | 3.1°C | 14.0°C | 0.2°C | 52 mm | 82% | 1.4 m/s | 3.1 |
| 2017 | 7.6°C | 5.4°C | 3.1°C | 11.6°C | -0.2°C | 138 mm | 89% | 1.9 m/s | 2.4 |
| 2016 | 10.3°C | 7.5°C | 4.7°C | 19.3°C | 1.4°C | 143 mm | 85% | 1.9 m/s | 3 |
| 2015 | 11.3°C | 8.5°C | 5.7°C | 15.6°C | 0.7°C | 88 mm | 83% | 1.3 m/s | 3 |
| 2014 | 9.0°C | 6.2°C | 3.4°C | 12.4°C | -0.5°C | 124 mm | 86% | 1.6 m/s | 2.8 |
| 2013 | 9.0°C | 6.4°C | 3.9°C | 14.9°C | 0.4°C | 91 mm | 81% | 1.5 m/s | 3 |
| 2012 | 7.2°C | 4.7°C | 2.2°C | 12.9°C | -1.0°C | 105 mm | 82% | 1.9 m/s | 2.6 |
| 2011 | 7.8°C | 5.4°C | 3.1°C | 12.1°C | -0.2°C | 125 mm | 88% | 1.9 m/s | 2.5 |
| 2010 | 9.3°C | 6.5°C | 3.8°C | 12.5°C | 0.4°C | 64 mm | 83% | 1.7 m/s | 3 |
| 2009 | 6.8°C | 4.1°C | 1.5°C | 11.8°C | -4.5°C | 70 mm | 80% | 1.9 m/s | 2.9 |
| 2008 | 7.2°C | 4.5°C | 1.9°C | 9.8°C | 0.0°C | 65 mm | 85% | 1.7 m/s | 2.7 |
| 2007 | 8.9°C | 6.2°C | 3.5°C | 13.9°C | -2.4°C | 123 mm | 86% | 1.7 m/s | 2.5 |
| 2006 | 8.5°C | 5.9°C | 3.2°C | 12.8°C | 0.5°C | 98 mm | 84% | 1.8 m/s | 3.1 |
| 2005 | 11.0°C | 7.9°C | 4.8°C | 16.0°C | 2.5°C | 96 mm | 84% | 1.6 m/s | 3.1 |
| 2004 | 9.9°C | 6.8°C | 3.8°C | 17.1°C | 1.6°C | 88 mm | 85% | 1.7 m/s | 3.1 |
| 2003 | 9.1°C | 6.5°C | 3.9°C | 12.5°C | -1.8°C | 119 mm | 86% | 1.9 m/s | 2.5 |
| 2002 ❄️ | 6.4°C | 3.7°C | 1.0°C | 12.7°C | -5.3°C | 73 mm | 82% | 1.8 m/s | 2.6 |
| 2001 | 9.0°C | 5.9°C | 2.8°C | 13.5°C | 0.8°C | 82 mm | 85% | 1.6 m/s | 2.9 |
| 2000 | 8.4°C | 5.8°C | 3.2°C | 12.3°C | 0.3°C | 99 mm | 85% | 1.8 m/s | 3 |
| 1999 | 7.6°C | 5.1°C | 2.6°C | 13.7°C | 0.1°C | 145 mm | 86% | 2 m/s | 2.9 |
| 1998 | 9.6°C | 6.9°C | 4.2°C | 14.4°C | 0.9°C | 59 mm | 82% | 1.4 m/s | 3 |
| 1997 🌧️ | 7.7°C | 5.2°C | 2.7°C | 11.4°C | -1.1°C | 165 mm | 86% | 2.1 m/s | 2.7 |
| 1996 | 9.1°C | 6.3°C | 3.5°C | 14.6°C | -0.7°C | 67 mm | 79% | 1.6 m/s | 3.1 |
| 1995 | 9.3°C | 6.4°C | 3.5°C | 15.0°C | -1.3°C | 115 mm | 80% | 1.7 m/s | 3.2 |
| 1994 | 10.3°C | 7.0°C | 3.8°C | 16.8°C | 0.2°C | 79 mm | 80% | 1.5 m/s | 3.3 |
| 1993 | 9.8°C | 6.7°C | 3.6°C | 13.0°C | 1.4°C | 111 mm | 83% | 1.7 m/s | 3 |
| 1992 🔥 | 12.9°C | 9.4°C | 5.9°C | 16.3°C | 3.5°C | 24 mm | 78% | 1.1 m/s | 3.7 |
| 1991 | 7.7°C | 4.8°C | 2.0°C | 13.8°C | -1.5°C | 69 mm | 82% | 1.6 m/s | 3.2 |
| 1990 | 9.7°C | 6.4°C | 3.1°C | 15.4°C | 0.1°C | 80 mm | 82% | 1.4 m/s | 3.2 |
| 1989 | 6.9°C | 4.4°C | 1.8°C | 10.7°C | -4.2°C | 140 mm | 86% | 1.8 m/s | 2.7 |
| 1988 | 9.2°C | 6.2°C | 3.2°C | 12.2°C | 0.7°C | 140 mm | 82% | 1.8 m/s | 2.8 |
| 1987 | 10.0°C | 7.1°C | 4.2°C | 15.4°C | 0.7°C | 136 mm | 83% | 1.5 m/s | 3.1 |
| 1986 | 9.9°C | 7.1°C | 4.3°C | 13.0°C | 1.9°C | 129 mm | 86% | 1.6 m/s | 2.8 |
| 1985 | 8.0°C | 5.0°C | 1.9°C | 12.9°C | 0.2°C | 93 mm | 83% | 1.7 m/s | 3.3 |
| 1984 | 10.1°C | 7.2°C | 4.2°C | 15.5°C | 2.0°C | 120 mm | 85% | 1.3 m/s | 3 |
| 1983 | 10.2°C | 7.4°C | 4.6°C | 13.6°C | 1.5°C | 136 mm | 84% | 1.6 m/s | — |
| 1982 | 8.2°C | 5.4°C | 2.6°C | 12.1°C | 0.8°C | 87 mm | 81% | 1.5 m/s | — |
| 1981 | 10.6°C | 7.3°C | 4.0°C | 14.1°C | 1.8°C | 91 mm | 81% | 1.6 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 9°C with lows near 3.3°C (mean 6.2°C), based on 45 years of NASA POWER data.
March averages 95 mm of rainfall in Duncan, a relatively wet time of year. The wettest on record was 165 mm in 1997.
The hottest March reached 19.3°C in 2016. The coldest dipped to -5.3°C in 2002.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have fallen by about 0.5°C. Daytime highs moved from 9.4°C to 8.7°C and overnight lows from 3.5°C to 3.4°C over the same span.
March is one of the cooler months of the year in Duncan and a relatively wet time of year, so plan for around 9°C daytime highs and 3.3°C at night.
Not quite — March is the 5th coolest month in Duncan, averaging 6.2°C.
For March in Duncan, pack warm layers and a jacket for chilly mornings, with typical highs of 9°C and lows of 3.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 83% — quite humid.
Average wind speed in March is 1.6 m/s. The windiest March on record averaged 2.1 m/s (1997).
The wettest March on record was 1997 with 165 mm. On average, March sees 95 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 Duncan 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.
