March is one of the cooler months of the year in New Castle, with average highs near 10.4°C and lows around 0.3°C (mean 5.4°C). It is about average for rainfall, averaging 101 mm of rainfall and 81% relative humidity across the period.
March is one of the cooler months of the year in New Castle. Across 45 years of records, the warmest March in New Castle was 2012 — when the month averaged 9.9°C — while the coldest was 1984 at 1.5°C. Typical March days reach 10.4°C with nights near 0.3°C. The long-term trend is warming, about 0.5°C per decade.
March is about average for rainfall in New Castle, averaging 101 mm of rainfall. The wettest March on record was 1994 with 207 mm, while the driest was 2006 at 10 mm.
Relative humidity in New Castle during March averages 81%. The most humid Marchs were 1993 and 1994 at 88%, and the least humid was 2025 at 74%.
March receives about 3.9 kWh/m²/day of solar energy in New Castle. The sunniest March was 2006 at 4.5 kWh/m²/day, and the cloudiest was 1993 at 3.2.
Average wind speed in New Castle during March is 3.3 m/s. The windiest March was 1999 at 4 m/s, while the calmest were 2003, 2012 and 2015, among others at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 4.6°C | 4.7°C | 5.5°C | 5.0°C | 7.6°C | +3°C |
| Avg High | 9.7°C | 9.6°C | 10.7°C | 9.9°C | 13.0°C | +3.3°C |
| Avg Low | -0.5°C | -0.1°C | 0.3°C | 0.1°C | 2.1°C | +2.6°C |
| Avg Rain | 86 mm | 125 mm | 92 mm | 100 mm | 100 mm | +14 mm |
March temperatures in New Castle have risen by about 3.2°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -19.4°C (2015) to a record high of 26.3°C (1998).
Rainfall in March is about average for rainfall, averaging 101 mm, with a wettest year of 207 mm.
A quieter season to visit New Castle
If your dates are flexible, the more temperate months of June and September tend to be the most comfortable for visiting New Castle. That said, March — with days averaging 10.4°C and nights around 0.3°C (mean 5.4°C) and higher rainfall (101 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 | 14.5°C | 8.4°C | 2.3°C | 25.3°C | -6.3°C | 111 mm | 74% | 3.5 m/s | 4.2 |
| 2024 | 12.8°C | 7.7°C | 2.7°C | 22.2°C | -3.1°C | 175 mm | 82% | 3.2 m/s | 4 |
| 2023 | 11.8°C | 6.4°C | 1.0°C | 18.2°C | -3.8°C | 50 mm | 77% | 3.3 m/s | 4 |
| 2022 | 12.5°C | 7.3°C | 2.0°C | 22.6°C | -6.0°C | 69 mm | 77% | 3.4 m/s | 3.8 |
| 2021 | 12.4°C | 7.0°C | 1.6°C | 23.2°C | -4.7°C | 107 mm | 80% | 3.1 m/s | 4.3 |
| 2020 | 13.7°C | 8.5°C | 3.2°C | 22.4°C | -4.1°C | 86 mm | 80% | 2.9 m/s | 3.6 |
| 2019 | 8.9°C | 4.1°C | -0.8°C | 20.2°C | -8.8°C | 107 mm | 82% | 3.1 m/s | 4.1 |
| 2018 | 7.8°C | 3.4°C | -1.0°C | 19.8°C | -3.8°C | 107 mm | 80% | 3.7 m/s | 3.9 |
| 2017 | 9.3°C | 4.3°C | -0.6°C | 21.2°C | -9.5°C | 119 mm | 75% | 3.6 m/s | 4 |
| 2016 | 13.6°C | 8.3°C | 3.0°C | 22.6°C | -4.4°C | 65 mm | 82% | 3 m/s | 4 |
| 2015 | 7.2°C | 2.2°C | -2.9°C | 17.7°C | -19.4°C | 133 mm | 82% | 2.8 m/s | 3.5 |
| 2014 | 7.0°C | 2.1°C | -2.8°C | 16.6°C | -12.7°C | 96 mm | 81% | 3.3 m/s | 3.5 |
| 2013 | 7.8°C | 3.4°C | -1.0°C | 13.8°C | -3.4°C | 74 mm | 80% | 3.4 m/s | 3.5 |
| 2012 🔥 | 15.1°C | 9.9°C | 4.6°C | 25.1°C | -4.2°C | 25 mm | 82% | 2.8 m/s | 4.1 |
| 2011 | 10.0°C | 5.0°C | 0.0°C | 22.2°C | -5.8°C | 122 mm | 80% | 3.3 m/s | 4.1 |
| 2010 | 12.4°C | 7.6°C | 2.7°C | 20.2°C | -3.5°C | 149 mm | 84% | 3.2 m/s | 3.6 |
| 2009 | 10.4°C | 5.4°C | 0.4°C | 21.5°C | -11.3°C | 47 mm | 80% | 2.9 m/s | 3.7 |
| 2008 | 11.6°C | 6.0°C | 0.3°C | 18.3°C | -3.5°C | 86 mm | 79% | 3.4 m/s | 4 |
| 2007 | 10.2°C | 4.7°C | -0.8°C | 23.0°C | -9.7°C | 104 mm | 82% | 3.3 m/s | 4.2 |
| 2006 | 10.9°C | 5.7°C | 0.5°C | 21.5°C | -4.6°C | 10 mm | 75% | 3 m/s | 4.5 |
| 2005 | 7.7°C | 3.2°C | -1.3°C | 15.6°C | -7.6°C | 93 mm | 81% | 3.1 m/s | 3.5 |
| 2004 | 11.1°C | 6.1°C | 1.1°C | 20.3°C | -4.1°C | 64 mm | 82% | 3.1 m/s | 3.7 |
| 2003 | 10.5°C | 5.5°C | 0.4°C | 20.3°C | -7.7°C | 106 mm | 86% | 2.8 m/s | 3.8 |
| 2002 | 12.5°C | 6.9°C | 1.2°C | 21.2°C | -6.7°C | 112 mm | 74% | 3.5 m/s | 3.7 |
| 2001 | 8.6°C | 3.8°C | -1.0°C | 13.5°C | -5.7°C | 138 mm | 79% | 3.5 m/s | 3.6 |
| 2000 | 13.4°C | 7.7°C | 1.9°C | 24.0°C | -5.4°C | 165 mm | 80% | 3.4 m/s | 4.1 |
| 1999 | 9.3°C | 4.0°C | -1.2°C | 18.2°C | -6.9°C | 105 mm | 76% | 4 m/s | 4.3 |
| 1998 | 10.4°C | 6.3°C | 2.2°C | 26.3°C | -5.5°C | 142 mm | 85% | 3.3 m/s | 3.7 |
| 1997 | 10.4°C | 5.4°C | 0.5°C | 19.5°C | -4.0°C | 133 mm | 82% | 3.6 m/s | 3.7 |
| 1996 | 6.9°C | 2.2°C | -2.5°C | 16.5°C | -11.3°C | 110 mm | 82% | 3.2 m/s | 4 |
| 1995 | 11.8°C | 6.1°C | 0.3°C | 20.8°C | -8.6°C | 52 mm | 79% | 2.9 m/s | 4 |
| 1994 🌧️ | 7.9°C | 3.5°C | -0.9°C | 19.6°C | -6.8°C | 207 mm | 88% | 3.3 m/s | 3.7 |
| 1993 | 7.4°C | 2.8°C | -1.7°C | 16.8°C | -14.4°C | 190 mm | 88% | 3.2 m/s | 3.2 |
| 1992 | 8.7°C | 4.0°C | -0.6°C | 17.2°C | -6.6°C | 108 mm | 80% | 3.4 m/s | 3.7 |
| 1991 | 11.1°C | 6.1°C | 1.2°C | 18.6°C | -4.7°C | 131 mm | 82% | 3.4 m/s | 3.7 |
| 1990 | 11.8°C | 6.8°C | 1.9°C | 24.3°C | -7.5°C | 75 mm | 81% | 2.8 m/s | 3.8 |
| 1989 | 9.5°C | 4.6°C | -0.3°C | 23.3°C | -8.7°C | 124 mm | 84% | 3.4 m/s | 3.5 |
| 1988 | 10.6°C | 5.3°C | 0.0°C | 20.0°C | -6.0°C | 61 mm | 79% | 3.2 m/s | 4.3 |
| 1987 | 10.7°C | 5.5°C | 0.2°C | 20.1°C | -6.4°C | 48 mm | 82% | 3 m/s | 4.2 |
| 1986 | 10.8°C | 5.1°C | -0.6°C | 20.7°C | -10.6°C | 43 mm | 80% | 3.2 m/s | 4.4 |
| 1985 | 11.1°C | 5.7°C | 0.2°C | 21.5°C | -6.1°C | 59 mm | 76% | 3.5 m/s | 3.9 |
| 1984 ❄️ | 5.7°C | 1.5°C | -2.6°C | 15.0°C | -10.5°C | 149 mm | 84% | 3.5 m/s | 3.7 |
| 1983 | 11.0°C | 6.0°C | 1.1°C | 19.1°C | -5.0°C | 173 mm | 82% | 3.8 m/s | — |
| 1982 | 9.4°C | 4.4°C | -0.6°C | 18.1°C | -5.3°C | 72 mm | 82% | 3.1 m/s | — |
| 1981 | 8.8°C | 3.6°C | -1.6°C | 20.7°C | -6.3°C | 41 mm | 76% | 3.3 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 10.4°C with lows near 0.3°C (mean 5.4°C), based on 45 years of NASA POWER data.
March averages 101 mm of rainfall in New Castle, about average for rainfall. The wettest on record was 207 mm in 1994.
The hottest March reached 26.3°C in 1998. The coldest dipped to -19.4°C in 2015.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 3.2°C. Daytime highs moved from 9.2°C to 12.8°C and overnight lows from -0.7°C to 1.9°C over the same span.
March is one of the cooler months of the year in New Castle and about average for rainfall, so plan for around 10.4°C daytime highs and 0.3°C at night.
Not quite — March is the 4th coolest month in New Castle, averaging 5.4°C.
For March in New Castle, pack warm layers and a jacket for chilly mornings, with typical highs of 10.4°C and lows of 0.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 81% — quite humid.
Average wind speed in March is 3.3 m/s. The windiest March on record averaged 4 m/s (1999).
The wettest March on record was 1994 with 207 mm. On average, March sees 101 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 New Castle 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.
