April is one of the cooler months of the year in Norristown, with average highs near 16.3°C and lows around 4.3°C (mean 10.3°C). It is about average for rainfall, averaging 96 mm of rainfall and 78% relative humidity across the period.
April is one of the cooler months of the year in Norristown. Across 45 years of records, the warmest April in Norristown was 2017 — when the month averaged 13.7°C — while the coldest was 1982 at 7.7°C. Typical April days reach 16.3°C with nights near 4.3°C. The long-term trend is warming, about 0.5°C per decade.
April is about average for rainfall in Norristown, averaging 96 mm of rainfall. The wettest April on record was 1983 with 216 mm, while the driest was 1985 at 17 mm.
Relative humidity in Norristown during April averages 78%. The most humid Aprils were 1983 and 1984 at 84%, and the least humid was 2012 at 72%.
April receives about 4.7 kWh/m²/day of solar energy in Norristown. The sunniest April was 2010 at 5.5 kWh/m²/day, and the cloudiest was 2011 at 3.8.
Average wind speed in Norristown during April is 0.7 m/s. The windiest Aprils were 1982, 1996 and 2020 at 0.8 m/s, while the calmest were 2017, 2021 and 2023, among others at 0.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 9.4°C | 9.8°C | 10.6°C | 10.9°C | 11.0°C | +1.6°C |
| Avg High | 15.3°C | 15.7°C | 16.6°C | 16.9°C | 16.8°C | +1.5°C |
| Avg Low | 3.4°C | 3.8°C | 4.6°C | 4.8°C | 5.1°C | +1.7°C |
| Avg Rain | 103 mm | 88 mm | 101 mm | 89 mm | 105 mm | +2 mm |
April temperatures in Norristown have risen by about 1.8°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -8.4°C (1982) to a record high of 33.5°C (2002).
Rainfall in April is about average for rainfall, averaging 96 mm, with a wettest year of 216 mm.
A good time to visit Norristown
April is a good time to visit Norristown, with days averaging 16.3°C and nights around 4.3°C (mean 10.3°C, cooler than Norristown's yearly average) and higher rainfall. June and August are marginally more temperate, but April still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 17.4°C | 11.5°C | 5.6°C | 25.2°C | -4.4°C | 75 mm | 74% | 0.7 m/s | 4.6 |
| 2024 | 17.4°C | 11.7°C | 6.0°C | 31.4°C | 0.5°C | 112 mm | 81% | 0.7 m/s | 4.5 |
| 2023 | 19.4°C | 13.0°C | 6.6°C | 28.2°C | -1.9°C | 136 mm | 75% | 0.6 m/s | 4.9 |
| 2022 | 15.8°C | 9.8°C | 3.8°C | 25.3°C | -1.1°C | 125 mm | 74% | 0.7 m/s | 4.9 |
| 2021 | 16.9°C | 10.9°C | 4.8°C | 27.5°C | -4.7°C | 52 mm | 77% | 0.6 m/s | 4.9 |
| 2020 | 14.2°C | 8.9°C | 3.5°C | 23.2°C | -2.7°C | 130 mm | 77% | 0.8 m/s | 4.3 |
| 2019 | 18.3°C | 12.4°C | 6.4°C | 24.8°C | -3.5°C | 90 mm | 79% | 0.7 m/s | 4.6 |
| 2018 | 14.2°C | 8.5°C | 2.7°C | 26.2°C | -2.7°C | 92 mm | 77% | 0.7 m/s | 4.4 |
| 2017 🔥 | 19.8°C | 13.7°C | 7.7°C | 28.7°C | -0.6°C | 75 mm | 79% | 0.6 m/s | 4.5 |
| 2016 | 15.9°C | 9.8°C | 3.8°C | 25.9°C | -5.0°C | 55 mm | 75% | 0.7 m/s | 5 |
| 2015 | 16.4°C | 10.2°C | 4.0°C | 24.3°C | -3.8°C | 68 mm | 78% | 0.7 m/s | 4.9 |
| 2014 | 15.4°C | 9.1°C | 2.8°C | 23.1°C | -4.3°C | 176 mm | 80% | 0.7 m/s | 5 |
| 2013 | 17.0°C | 10.8°C | 4.5°C | 26.2°C | -4.7°C | 68 mm | 77% | 0.7 m/s | 5.3 |
| 2012 | 16.7°C | 10.5°C | 4.3°C | 28.9°C | -0.3°C | 65 mm | 72% | 0.7 m/s | 5.4 |
| 2011 | 16.9°C | 11.6°C | 6.2°C | 26.8°C | -0.9°C | 136 mm | 82% | 0.7 m/s | 3.8 |
| 2010 | 18.6°C | 12.3°C | 6.0°C | 28.0°C | 0.9°C | 62 mm | 78% | 0.6 m/s | 5.5 |
| 2009 | 16.6°C | 10.7°C | 4.8°C | 31.0°C | -3.5°C | 101 mm | 78% | 0.7 m/s | 4.7 |
| 2008 | 17.6°C | 11.6°C | 5.6°C | 27.7°C | -4.2°C | 78 mm | 79% | 0.6 m/s | 4.9 |
| 2007 | 14.1°C | 8.7°C | 3.2°C | 26.2°C | -3.4°C | 193 mm | 79% | 0.7 m/s | 4.3 |
| 2006 | 18.1°C | 11.7°C | 5.4°C | 25.7°C | -1.7°C | 93 mm | 75% | 0.7 m/s | 5.4 |
| 2005 | 17.4°C | 11.1°C | 4.8°C | 26.5°C | -0.5°C | 128 mm | 78% | 0.7 m/s | 5.2 |
| 2004 | 16.3°C | 10.6°C | 5.0°C | 26.9°C | -3.3°C | 134 mm | 80% | 0.7 m/s | 4.6 |
| 2003 | 15.0°C | 9.3°C | 3.6°C | 25.8°C | -4.6°C | 66 mm | 82% | 0.7 m/s | 4.3 |
| 2002 | 18.9°C | 12.4°C | 5.9°C | 33.5°C | -5.2°C | 76 mm | 72% | 0.6 m/s | 4.7 |
| 2001 | 17.0°C | 10.6°C | 4.3°C | 28.0°C | -3.3°C | 53 mm | 78% | 0.6 m/s | 4.8 |
| 2000 | 15.2°C | 9.4°C | 3.6°C | 23.6°C | -2.6°C | 85 mm | 80% | 0.7 m/s | 4.2 |
| 1999 | 16.4°C | 10.0°C | 3.5°C | 23.7°C | -0.6°C | 80 mm | 76% | 0.6 m/s | 4.9 |
| 1998 | 16.6°C | 10.9°C | 5.1°C | 23.5°C | -0.7°C | 121 mm | 79% | 0.6 m/s | 4.9 |
| 1997 | 14.4°C | 8.4°C | 2.4°C | 20.8°C | -5.0°C | 53 mm | 76% | 0.7 m/s | 5.2 |
| 1996 | 14.5°C | 9.0°C | 3.5°C | 24.4°C | -2.7°C | 137 mm | 82% | 0.8 m/s | 4.5 |
| 1995 | 15.3°C | 8.8°C | 2.3°C | 25.2°C | -4.9°C | 55 mm | 74% | 0.7 m/s | 5 |
| 1994 | 17.7°C | 11.6°C | 5.5°C | 26.7°C | -2.6°C | 79 mm | 81% | 0.6 m/s | 5.2 |
| 1993 | 15.3°C | 9.4°C | 3.5°C | 22.2°C | -3.1°C | 150 mm | 82% | 0.7 m/s | 4.4 |
| 1992 | 15.0°C | 9.0°C | 3.1°C | 23.0°C | -3.6°C | 42 mm | 79% | 0.6 m/s | 4.4 |
| 1991 | 16.4°C | 10.7°C | 5.0°C | 26.0°C | -3.6°C | 77 mm | 81% | 0.6 m/s | 4.2 |
| 1990 | 15.7°C | 10.1°C | 4.4°C | 29.8°C | -4.6°C | 87 mm | 80% | 0.7 m/s | 4.4 |
| 1989 | 14.6°C | 8.5°C | 2.5°C | 23.6°C | -4.1°C | 63 mm | 77% | 0.6 m/s | 4.8 |
| 1988 | 14.3°C | 8.6°C | 2.9°C | 20.7°C | -1.5°C | 74 mm | 79% | 0.7 m/s | 4.6 |
| 1987 | 15.1°C | 9.7°C | 4.2°C | 23.2°C | -3.0°C | 93 mm | 83% | 0.6 m/s | 4.3 |
| 1986 | 15.3°C | 9.7°C | 4.1°C | 24.0°C | -1.7°C | 99 mm | 81% | 0.6 m/s | 4.5 |
| 1985 | 18.1°C | 11.6°C | 5.1°C | 30.4°C | -5.8°C | 17 mm | 73% | 0.6 m/s | 4.8 |
| 1984 | 14.3°C | 8.8°C | 3.3°C | 22.1°C | -2.6°C | 118 mm | 84% | 0.6 m/s | 4.3 |
| 1983 🌧️ | 14.2°C | 9.0°C | 3.8°C | 25.2°C | -2.9°C | 216 mm | 84% | 0.7 m/s | — |
| 1982 ❄️ | 14.1°C | 7.7°C | 1.2°C | 23.0°C | -8.4°C | 138 mm | 75% | 0.8 m/s | — |
| 1981 | 17.5°C | 10.7°C | 3.9°C | 26.0°C | -3.7°C | 106 mm | 75% | 0.7 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 16.3°C with lows near 4.3°C (mean 10.3°C), based on 45 years of NASA POWER data.
April averages 96 mm of rainfall in Norristown, about average for rainfall. The wettest on record was 216 mm in 1983.
The hottest April reached 33.5°C in 2002. The coldest dipped to -8.4°C in 1982.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.8°C. Daytime highs moved from 15.6°C to 17.4°C and overnight lows from 3.5°C to 5.4°C over the same span.
April is one of the cooler months of the year in Norristown and about average for rainfall, so plan for around 16.3°C daytime highs and 4.3°C at night.
Not quite — April is the 6th coolest month in Norristown, averaging 10.3°C.
For April in Norristown, pack warm layers and a jacket for chilly mornings, with typical highs of 16.3°C and lows of 4.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in April averages 78% — quite humid.
Average wind speed in April is 0.7 m/s. The windiest April on record averaged 0.8 m/s (1982).
The wettest April on record was 1983 with 216 mm. On average, April sees 96 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 Norristown behaves each April, 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 April specifically, along with year-by-year records and how the month has changed over the decades.
