March is one of the cooler months of the year in New Castle, with average highs near 8.2°C and lows around -2.8°C (mean 2.7°C). It is about average for rainfall, averaging 74 mm of rainfall and 82% 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 8.9°C — while the coldest was 1984 at -1.8°C. Typical March days reach 8.2°C with nights near -2.8°C. The long-term trend is warming, about 0.4°C per decade.
March is about average for rainfall in New Castle, averaging 74 mm of rainfall. The wettest March on record was 2008 with 154 mm, while the driest was 1990 at 32 mm.
Relative humidity in New Castle during March averages 82%. The most humid March was 2008 at 90%, and the least humid was 2021 at 75%.
March receives about 3.3 kWh/m²/day of solar energy in New Castle. The sunniest March was 2021 at 4.3 kWh/m²/day, and the cloudiest was 2013 at 2.7.
Average wind speed in New Castle during March is 0.5 m/s. The windiest Marchs were 2023, 2024 and 2025, among others at 0.6 m/s, while the calmest were 2019, 2020 and 2021, among others at 0.5 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 2.0°C | 2.1°C | 2.7°C | 2.4°C | 4.9°C | +2.9°C |
| Avg High | 7.6°C | 7.5°C | 8.1°C | 7.8°C | 11.0°C | +3.4°C |
| Avg Low | -3.6°C | -3.1°C | -2.8°C | -2.9°C | -1.2°C | +2.4°C |
| Avg Rain | 76 mm | 69 mm | 73 mm | 75 mm | 81 mm | +5 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 -17.6°C (1984) to a record high of 27.2°C (2012).
Rainfall in March is about average for rainfall, averaging 74 mm, with a wettest year of 154 mm.
A quieter season to visit New Castle
If your dates are flexible, the more temperate months of August and July tend to be the most comfortable for visiting New Castle. That said, March — with days averaging 8.2°C and nights around -2.8°C (mean 2.7°C) and moderate rainfall (74 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 | 12.4°C | 5.5°C | -1.4°C | 23.6°C | -9.5°C | 56 mm | 77% | 0.6 m/s | 3.6 |
| 2024 | 11.5°C | 5.8°C | 0.2°C | 22.0°C | -6.6°C | 85 mm | 81% | 0.6 m/s | 3.4 |
| 2023 | 8.5°C | 3.0°C | -2.5°C | 18.1°C | -7.4°C | 96 mm | 80% | 0.6 m/s | 3.2 |
| 2022 | 9.9°C | 4.1°C | -1.7°C | 20.5°C | -11.8°C | 75 mm | 82% | 0.6 m/s | 3.4 |
| 2021 | 12.3°C | 5.4°C | -1.4°C | 20.7°C | -9.8°C | 47 mm | 75% | 0.5 m/s | 4.3 |
| 2020 | 11.5°C | 5.7°C | -0.2°C | 21.8°C | -8.8°C | 130 mm | 84% | 0.5 m/s | 3.1 |
| 2019 | 6.1°C | 1.1°C | -4.0°C | 18.9°C | -13.6°C | 72 mm | 82% | 0.5 m/s | 3.4 |
| 2018 | 4.3°C | -0.2°C | -4.7°C | 15.8°C | -8.8°C | 89 mm | 85% | 0.6 m/s | 3.4 |
| 2017 | 7.0°C | 2.4°C | -2.3°C | 19.3°C | -11.8°C | 100 mm | 82% | 0.6 m/s | 3 |
| 2016 | 12.1°C | 6.2°C | 0.3°C | 21.4°C | -6.4°C | 83 mm | 81% | 0.5 m/s | 3.4 |
| 2015 | 6.2°C | 0.3°C | -5.6°C | 15.1°C | -17.2°C | 69 mm | 82% | 0.5 m/s | 3.5 |
| 2014 | 5.4°C | -0.8°C | -7.0°C | 17.2°C | -17.1°C | 42 mm | 76% | 0.6 m/s | 3.3 |
| 2013 | 4.2°C | 0.2°C | -3.9°C | 16.7°C | -11.6°C | 48 mm | 84% | 0.5 m/s | 2.7 |
| 2012 🔥 | 14.9°C | 8.9°C | 2.9°C | 27.2°C | -7.6°C | 67 mm | 83% | 0.5 m/s | 3.6 |
| 2011 | 6.7°C | 1.6°C | -3.6°C | 18.8°C | -10.5°C | 116 mm | 85% | 0.5 m/s | 3.4 |
| 2010 | 11.0°C | 4.7°C | -1.6°C | 19.7°C | -8.2°C | 67 mm | 82% | 0.5 m/s | 3.9 |
| 2009 | 9.8°C | 3.6°C | -2.6°C | 18.6°C | -12.6°C | 80 mm | 79% | 0.6 m/s | 3.8 |
| 2008 🌧️ | 4.9°C | 0.2°C | -4.5°C | 13.9°C | -11.7°C | 154 mm | 90% | 0.5 m/s | 3.1 |
| 2007 | 9.1°C | 3.6°C | -1.9°C | 22.4°C | -13.3°C | 100 mm | 86% | 0.6 m/s | 3.4 |
| 2006 | 7.6°C | 2.5°C | -2.7°C | 21.8°C | -9.1°C | 50 mm | 80% | 0.5 m/s | 3.3 |
| 2005 | 5.4°C | 0.5°C | -4.4°C | 19.5°C | -13.1°C | 39 mm | 87% | 0.5 m/s | 3.1 |
| 2004 | 9.2°C | 4.3°C | -0.6°C | 21.6°C | -7.6°C | 83 mm | 84% | 0.5 m/s | 2.9 |
| 2003 | 9.6°C | 3.2°C | -3.3°C | 21.7°C | -15.8°C | 52 mm | 82% | 0.5 m/s | 3.2 |
| 2002 | 7.9°C | 2.6°C | -2.8°C | 19.5°C | -11.6°C | 77 mm | 80% | 0.6 m/s | 3.1 |
| 2001 | 5.6°C | 0.8°C | -4.1°C | 12.2°C | -8.0°C | 54 mm | 80% | 0.5 m/s | 2.9 |
| 2000 | 11.6°C | 5.3°C | -1.0°C | 24.1°C | -8.1°C | 42 mm | 76% | 0.6 m/s | 3.3 |
| 1999 | 6.1°C | 0.3°C | -5.4°C | 19.3°C | -15.7°C | 37 mm | 81% | 0.6 m/s | 4.1 |
| 1998 | 8.7°C | 4.1°C | -0.5°C | 24.7°C | -10.5°C | 55 mm | 83% | 0.6 m/s | 3.4 |
| 1997 | 7.6°C | 2.4°C | -2.8°C | 17.4°C | -8.0°C | 101 mm | 85% | 0.6 m/s | 2.9 |
| 1996 | 5.0°C | -0.5°C | -6.0°C | 16.5°C | -16.6°C | 81 mm | 80% | 0.6 m/s | 3.5 |
| 1995 | 10.3°C | 3.6°C | -3.0°C | 21.2°C | -11.3°C | 42 mm | 79% | 0.5 m/s | 3 |
| 1994 | 5.5°C | 0.6°C | -4.2°C | 20.1°C | -13.8°C | 95 mm | 86% | 0.5 m/s | 3.4 |
| 1993 | 5.9°C | 1.0°C | -3.8°C | 18.2°C | -16.6°C | 103 mm | 90% | 0.5 m/s | 3 |
| 1992 | 6.8°C | 1.7°C | -3.5°C | 20.7°C | -11.5°C | 77 mm | 82% | 0.5 m/s | 3.6 |
| 1991 | 8.4°C | 3.6°C | -1.1°C | 19.8°C | -10.7°C | 71 mm | 86% | 0.6 m/s | 3 |
| 1990 | 10.2°C | 4.6°C | -1.0°C | 23.3°C | -12.6°C | 32 mm | 81% | 0.5 m/s | 3 |
| 1989 | 8.5°C | 2.2°C | -4.0°C | 22.6°C | -13.4°C | 102 mm | 82% | 0.5 m/s | 3.1 |
| 1988 | 7.8°C | 2.0°C | -3.8°C | 20.3°C | -12.8°C | 55 mm | 81% | 0.5 m/s | 3.2 |
| 1987 | 9.8°C | 3.7°C | -2.4°C | 21.8°C | -10.5°C | 71 mm | 79% | 0.5 m/s | 3.8 |
| 1986 | 8.2°C | 2.3°C | -3.6°C | 22.1°C | -16.4°C | 51 mm | 84% | 0.5 m/s | 3.2 |
| 1985 | 8.8°C | 3.2°C | -2.4°C | 19.3°C | -9.5°C | 129 mm | 81% | 0.6 m/s | 3.4 |
| 1984 ❄️ | 3.0°C | -1.8°C | -6.5°C | 19.3°C | -17.6°C | 67 mm | 89% | 0.6 m/s | 3.7 |
| 1983 | 9.2°C | 3.8°C | -1.7°C | 21.4°C | -11.3°C | 86 mm | 82% | 0.5 m/s | — |
| 1982 | 7.3°C | 1.7°C | -3.9°C | 18.7°C | -13.5°C | 82 mm | 84% | 0.6 m/s | — |
| 1981 | 6.2°C | 1.1°C | -4.1°C | 20.8°C | -11.8°C | 42 mm | 80% | 0.6 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 8.2°C with lows near -2.8°C (mean 2.7°C), based on 45 years of NASA POWER data.
March averages 74 mm of rainfall in New Castle, about average for rainfall. The wettest on record was 154 mm in 2008.
The hottest March reached 27.2°C in 2012. The coldest dipped to -17.6°C in 1984.
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 6.9°C to 10.9°C and overnight lows from -3.7°C to -1.4°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 8.2°C daytime highs and -2.8°C at night.
Not quite — March is the 4th coolest month in New Castle, averaging 2.7°C.
For March in New Castle, pack warm layers and a jacket for chilly mornings, with typical highs of 8.2°C and lows of -2.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 82% — quite humid.
Average wind speed in March is 0.5 m/s. The windiest March on record averaged 0.6 m/s (1981).
The wettest March on record was 2008 with 154 mm. On average, March sees 74 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.
