January is one of the cooler months of the year in New Castle, with average highs near 3.7°C and lows around -4.2°C (mean -0.2°C). It is one of the drier months, averaging 80 mm of rainfall and 84% relative humidity across the period.
January is one of the cooler months of the year in New Castle. Across 45 years of records, the warmest January in New Castle was 2023 — when the month averaged 4.7°C — while the coldest was 1994 at -5.3°C. Typical January days reach 3.7°C with nights near -4.2°C. The long-term trend is warming, about 0.6°C per decade.
January is one of the drier months in New Castle, averaging 80 mm of rainfall. The wettest January on record was 2024 with 161 mm, while the driest was 1981 at 12 mm.
Relative humidity in New Castle during January averages 84%. The most humid January was 1987 at 91%, and the least humid was 2025 at 75%.
January receives about 2 kWh/m²/day of solar energy in New Castle. The sunniest Januarys were 1995 and 2016 at 2.3 kWh/m²/day, and the cloudiest were 2023 and 2024 at 1.6.
Average wind speed in New Castle during January is 3.1 m/s. The windiest January was 2000 at 3.7 m/s, while the calmest was 1984 at 2.4 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | -2.2°C | 0.5°C | 0.1°C | -0.5°C | 1.3°C | +3.5°C |
| Avg High | 1.8°C | 4.6°C | 4.0°C | 3.5°C | 5.3°C | +3.5°C |
| Avg Low | -6.2°C | -3.5°C | -3.9°C | -4.4°C | -2.6°C | +3.6°C |
| Avg Rain | 71 mm | 104 mm | 70 mm | 77 mm | 76 mm | +5 mm |
January temperatures in New Castle have risen by about 4.1°C between 1981–1985 and 2021–2025.
January has ranged from a record low of -24.2°C (1994) to a record high of 19.5°C (2002).
Rainfall in January is one of the drier months, averaging 80 mm, with a wettest year of 161 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, January — with days averaging 3.7°C and nights around -4.2°C (mean -0.2°C) and higher rainfall (80 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 | 2.3°C | -1.5°C | -5.4°C | 10.1°C | -12.0°C | 27 mm | 75% | 3.4 m/s | 2.2 |
| 2024 🌧️ | 5.8°C | 1.8°C | -2.3°C | 19.0°C | -10.0°C | 161 mm | 88% | 2.9 m/s | 1.6 |
| 2023 🔥 | 8.7°C | 4.7°C | 0.6°C | 15.8°C | -3.8°C | 69 mm | 87% | 2.8 m/s | 1.6 |
| 2022 | 3.0°C | -1.2°C | -5.4°C | 14.1°C | -13.8°C | 76 mm | 78% | 3.3 m/s | 2.1 |
| 2021 | 4.4°C | 1.1°C | -2.2°C | 10.0°C | -8.6°C | 49 mm | 85% | 2.7 m/s | 2.1 |
| 2020 | 7.3°C | 3.1°C | -1.0°C | 18.1°C | -6.8°C | 73 mm | 82% | 2.9 m/s | 2.1 |
| 2019 | 3.7°C | -0.2°C | -4.1°C | 14.6°C | -15.2°C | 87 mm | 85% | 3.3 m/s | 1.9 |
| 2018 | 3.6°C | -1.0°C | -5.5°C | 16.7°C | -17.5°C | 59 mm | 80% | 3.2 m/s | 2.1 |
| 2017 | 5.9°C | 2.4°C | -1.1°C | 16.6°C | -11.4°C | 76 mm | 84% | 3 m/s | 1.7 |
| 2016 | 3.4°C | -0.7°C | -4.8°C | 16.7°C | -12.9°C | 80 mm | 81% | 3.2 m/s | 2.3 |
| 2015 | 2.0°C | -1.9°C | -5.7°C | 14.4°C | -12.8°C | 116 mm | 82% | 3.1 m/s | 2 |
| 2014 | 1.1°C | -3.1°C | -7.4°C | 14.2°C | -16.1°C | 75 mm | 84% | 3.1 m/s | 2.1 |
| 2013 | 5.0°C | 1.3°C | -2.5°C | 18.2°C | -11.0°C | 83 mm | 85% | 2.7 m/s | 1.9 |
| 2012 | 6.2°C | 2.0°C | -2.2°C | 16.3°C | -9.1°C | 58 mm | 84% | 3.1 m/s | 2.2 |
| 2011 | 0.9°C | -2.7°C | -6.3°C | 8.7°C | -14.6°C | 72 mm | 85% | 2.7 m/s | 1.9 |
| 2010 | 2.7°C | -0.9°C | -4.5°C | 14.4°C | -11.5°C | 61 mm | 86% | 3.2 m/s | 2.1 |
| 2009 | 1.0°C | -2.4°C | -5.8°C | 6.9°C | -14.2°C | 65 mm | 82% | 2.7 m/s | 2 |
| 2008 | 5.1°C | 1.1°C | -2.8°C | 16.3°C | -10.5°C | 43 mm | 82% | 2.9 m/s | 2.2 |
| 2007 | 6.9°C | 3.0°C | -0.8°C | 19.1°C | -11.4°C | 82 mm | 83% | 3.1 m/s | 2 |
| 2006 | 8.4°C | 3.8°C | -0.7°C | 15.4°C | -5.1°C | 93 mm | 85% | 3.3 m/s | 2 |
| 2005 | 3.7°C | -0.5°C | -4.6°C | 19.0°C | -17.3°C | 97 mm | 88% | 3 m/s | 1.8 |
| 2004 | 0.2°C | -3.6°C | -7.4°C | 15.2°C | -15.1°C | 45 mm | 83% | 3.6 m/s | 2.1 |
| 2003 | 0.8°C | -2.6°C | -6.1°C | 10.5°C | -13.2°C | 52 mm | 84% | 3.3 m/s | 2 |
| 2002 | 7.3°C | 3.1°C | -1.2°C | 19.5°C | -9.7°C | 63 mm | 81% | 2.9 m/s | 2.1 |
| 2001 | 3.5°C | -0.3°C | -4.2°C | 10.5°C | -9.9°C | 77 mm | 86% | 2.6 m/s | 2 |
| 2000 | 3.1°C | -1.0°C | -5.2°C | 17.6°C | -16.6°C | 82 mm | 83% | 3.7 m/s | 2.2 |
| 1999 | 6.3°C | 1.4°C | -3.5°C | 18.6°C | -10.7°C | 157 mm | 83% | 3.2 m/s | 2 |
| 1998 | 7.7°C | 3.7°C | -0.3°C | 18.6°C | -6.8°C | 128 mm | 87% | 3 m/s | 1.8 |
| 1997 | 3.1°C | -0.7°C | -4.6°C | 15.1°C | -15.1°C | 72 mm | 85% | 3.6 m/s | 2 |
| 1996 | 1.4°C | -2.7°C | -6.8°C | 15.2°C | -19.0°C | 140 mm | 90% | 3.5 m/s | 1.7 |
| 1995 | 5.9°C | 2.4°C | -1.2°C | 17.9°C | -9.6°C | 88 mm | 83% | 3.3 m/s | 2.3 |
| 1994 ❄️ | -0.8°C | -5.3°C | -9.8°C | 10.9°C | -24.2°C | 136 mm | 91% | 3.2 m/s | 2 |
| 1993 | 5.5°C | 1.8°C | -1.8°C | 14.8°C | -5.1°C | 67 mm | 84% | 3 m/s | 1.9 |
| 1992 | 5.3°C | 1.1°C | -3.1°C | 16.8°C | -11.2°C | 43 mm | 82% | 3.3 m/s | 2.1 |
| 1991 | 4.4°C | 0.6°C | -3.3°C | 14.5°C | -9.6°C | 111 mm | 84% | 2.9 m/s | 2.2 |
| 1990 | 7.0°C | 3.0°C | -1.0°C | 15.1°C | -4.4°C | 99 mm | 87% | 2.9 m/s | 2.1 |
| 1989 | 5.4°C | 1.5°C | -2.4°C | 10.6°C | -11.3°C | 70 mm | 83% | 2.8 m/s | 2 |
| 1988 | 1.1°C | -2.8°C | -6.7°C | 11.3°C | -14.1°C | 78 mm | 84% | 2.8 m/s | 2.1 |
| 1987 | 1.3°C | -2.4°C | -6.1°C | 12.2°C | -22.7°C | 133 mm | 91% | 3.1 m/s | 2.1 |
| 1986 | 3.3°C | -0.8°C | -4.9°C | 11.4°C | -13.5°C | 98 mm | 83% | 3.2 m/s | 2 |
| 1985 | 0.8°C | -3.2°C | -7.2°C | 16.3°C | -19.8°C | 53 mm | 81% | 3.4 m/s | 2.1 |
| 1984 | 0.0°C | -4.3°C | -8.5°C | 7.4°C | -21.3°C | 48 mm | 91% | 2.4 m/s | 1.9 |
| 1983 | 4.4°C | 0.6°C | -3.2°C | 11.8°C | -12.0°C | 61 mm | 83% | 3 m/s | — |
| 1982 | -0.3°C | -4.6°C | -8.9°C | 15.3°C | -19.3°C | 89 mm | 85% | 3.6 m/s | — |
| 1981 | 0.3°C | -3.9°C | -8.2°C | 8.9°C | -17.1°C | 12 mm | 80% | 2.8 m/s | — |
Actual recorded January data for each year, 1981–2025 — sourced from NASA POWER.
The average high in January is around 3.7°C with lows near -4.2°C (mean -0.2°C), based on 45 years of NASA POWER data.
January averages 80 mm of rainfall in New Castle, one of the drier months. The wettest on record was 161 mm in 2024.
The hottest January reached 19.5°C in 2002. The coldest dipped to -24.2°C in 1994.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average January temperatures have risen by about 4.1°C. Daytime highs moved from 1°C to 4.8°C and overnight lows from -7.2°C to -2.9°C over the same span.
January is one of the cooler months of the year in New Castle and one of the drier months, so plan for around 3.7°C daytime highs and -4.2°C at night.
Yes — January is the coldest month of the year in New Castle, averaging -0.2°C.
For January in New Castle, pack warm layers and a jacket for chilly mornings, with typical highs of 3.7°C and lows of -4.2°C. Bring an umbrella or light rain jacket too.
Relative humidity in January averages 84% — quite humid.
Average wind speed in January is 3.1 m/s. The windiest January on record averaged 3.7 m/s (2000).
The wettest January on record was 2024 with 161 mm. On average, January sees 80 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 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.
