April is one of the cooler months of the year in Richland, with average highs near 17.7°C and lows around 4.3°C (mean 11°C). It is about average for rainfall, averaging 21 mm of rainfall and 57% relative humidity across the period.
April is one of the cooler months of the year in Richland. Across 45 years of records, the warmest April in Richland was 2016 — when the month averaged 14.9°C — while the coldest was 2011 at 7.7°C. Typical April days reach 17.7°C with nights near 4.3°C. The long-term April temperature trend is broadly flat.
April is about average for rainfall in Richland, averaging 21 mm of rainfall. The wettest April on record was 1995 with 43 mm, while the driest was 2021 at 2 mm.
Relative humidity in Richland during April averages 57%. The most humid April was 1993 at 64%, and the least humid was 2021 at 46%.
April receives about 5.3 kWh/m²/day of solar energy in Richland. The sunniest Aprils were 2021 and 2025 at 6.1 kWh/m²/day, and the cloudiest was 1988 at 4.7.
Average wind speed in Richland during April is 2.5 m/s. The windiest Aprils were 1981, 1991 and 2010 at 3 m/s, while the calmest was 1998 at 1.9 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 10.9°C | 11.2°C | 10.9°C | 11.2°C | 10.7°C | -0.2°C |
| Avg High | 17.6°C | 17.8°C | 17.6°C | 17.8°C | 17.7°C | +0.1°C |
| Avg Low | 4.1°C | 4.6°C | 4.2°C | 4.6°C | 3.8°C | -0.3°C |
| Avg Rain | 19 mm | 24 mm | 19 mm | 22 mm | 17 mm | -2 mm |
April temperatures in Richland have risen by about 0.5°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -3.4°C (1997) to a record high of 31.9°C (2012).
Rainfall in April is about average for rainfall, averaging 21 mm, with a wettest year of 43 mm.
A good time to visit Richland
April is a good time to visit Richland, with days averaging 17.7°C and nights around 4.3°C (mean 11°C, close to Richland's yearly average) and low rainfall. August and June 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 | 18.9°C | 11.0°C | 3.1°C | 26.0°C | -1.0°C | 17 mm | 58% | 2.1 m/s | 6.1 |
| 2024 | 17.8°C | 11.0°C | 4.3°C | 26.6°C | 0.8°C | 8 mm | 57% | 2.4 m/s | 5.4 |
| 2023 | 16.2°C | 10.0°C | 3.8°C | 30.4°C | -2.3°C | 31 mm | 59% | 2.2 m/s | 5 |
| 2022 | 13.8°C | 8.1°C | 2.5°C | 21.9°C | -2.5°C | 39 mm | 59% | 2.5 m/s | 5 |
| 2021 | 20.1°C | 12.2°C | 4.3°C | 29.0°C | -3.0°C | 2 mm | 46% | 2.7 m/s | 6.1 |
| 2020 | 19.3°C | 12.0°C | 4.7°C | 24.6°C | -2.0°C | 5 mm | 51% | 2.3 m/s | 5.9 |
| 2019 | 18.1°C | 11.7°C | 5.4°C | 25.6°C | 0.9°C | 29 mm | 59% | 2.6 m/s | 5 |
| 2018 | 17.4°C | 11.1°C | 4.8°C | 28.5°C | -1.1°C | 43 mm | 60% | 2.8 m/s | 5.2 |
| 2017 | 16.1°C | 10.2°C | 4.3°C | 21.5°C | -0.7°C | 32 mm | 62% | 2.7 m/s | 5.1 |
| 2016 🔥 | 22.3°C | 14.9°C | 7.6°C | 30.5°C | 2.7°C | 8 mm | 52% | 2.3 m/s | 6 |
| 2015 | 18.6°C | 11.6°C | 4.5°C | 26.8°C | 0.1°C | 5 mm | 49% | 2.3 m/s | 5.9 |
| 2014 | 18.4°C | 11.6°C | 4.9°C | 26.8°C | 0.3°C | 21 mm | 55% | 2.7 m/s | 5.5 |
| 2013 | 17.8°C | 11.1°C | 4.3°C | 28.0°C | -2.0°C | 18 mm | 55% | 2.8 m/s | 5.4 |
| 2012 | 18.2°C | 11.5°C | 4.9°C | 31.9°C | -0.7°C | 29 mm | 60% | 2.4 m/s | 5.1 |
| 2011 ❄️ | 13.9°C | 7.7°C | 1.6°C | 21.3°C | -1.4°C | 18 mm | 60% | 2.8 m/s | 5.1 |
| 2010 | 17.1°C | 10.6°C | 4.1°C | 27.7°C | -1.1°C | 22 mm | 56% | 3 m/s | 5.1 |
| 2009 | 17.2°C | 10.4°C | 3.6°C | 29.4°C | -1.6°C | 14 mm | 55% | 2.3 m/s | 5.3 |
| 2008 | 15.2°C | 8.5°C | 1.7°C | 25.1°C | -2.6°C | 7 mm | 54% | 2.5 m/s | 5.5 |
| 2007 | 17.5°C | 10.8°C | 4.1°C | 24.7°C | -2.1°C | 12 mm | 56% | 2.4 m/s | 5.5 |
| 2006 | 17.3°C | 10.9°C | 4.4°C | 27.0°C | -0.1°C | 30 mm | 60% | 2.3 m/s | 5 |
| 2005 | 18.8°C | 12.0°C | 5.1°C | 28.5°C | 0.4°C | 17 mm | 52% | 2.4 m/s | 5.3 |
| 2004 | 20.1°C | 12.9°C | 5.7°C | 28.6°C | -1.1°C | 12 mm | 53% | 2.1 m/s | 5.7 |
| 2003 | 16.2°C | 10.3°C | 4.4°C | 23.4°C | 0.1°C | 41 mm | 61% | 2.2 m/s | 5.3 |
| 2002 | 17.9°C | 11.0°C | 4.1°C | 26.1°C | -0.9°C | 14 mm | 54% | 2.6 m/s | 5.6 |
| 2001 | 16.2°C | 9.8°C | 3.5°C | 28.8°C | -1.9°C | 29 mm | 59% | 2.4 m/s | 4.9 |
| 2000 | 19.8°C | 12.6°C | 5.4°C | 26.9°C | 0.0°C | 14 mm | 56% | 2.4 m/s | 5.4 |
| 1999 | 17.2°C | 9.8°C | 2.4°C | 26.4°C | -1.7°C | 7 mm | 56% | 2.4 m/s | 5.4 |
| 1998 | 18.6°C | 11.5°C | 4.4°C | 31.5°C | -1.0°C | 6 mm | 55% | 1.9 m/s | 5.6 |
| 1997 | 16.1°C | 9.7°C | 3.2°C | 25.5°C | -3.4°C | 24 mm | 61% | 2.6 m/s | 5.3 |
| 1996 | 17.8°C | 11.6°C | 5.3°C | 25.9°C | -0.1°C | 20 mm | 60% | 2.6 m/s | 4.9 |
| 1995 🌧️ | 15.9°C | 9.8°C | 3.6°C | 23.8°C | -0.9°C | 43 mm | 60% | 2.2 m/s | 5.2 |
| 1994 | 19.5°C | 12.8°C | 6.0°C | 28.8°C | 2.0°C | 26 mm | 55% | 2.4 m/s | 5.1 |
| 1993 | 16.3°C | 10.4°C | 4.4°C | 21.9°C | -0.2°C | 35 mm | 64% | 2.6 m/s | 4.8 |
| 1992 | 18.8°C | 12.5°C | 6.2°C | 27.9°C | 0.2°C | 36 mm | 58% | 2.6 m/s | 5 |
| 1991 | 17.4°C | 10.7°C | 3.9°C | 26.0°C | -1.1°C | 16 mm | 55% | 3 m/s | 5.3 |
| 1990 | 20.4°C | 13.6°C | 6.7°C | 25.4°C | 2.3°C | 23 mm | 54% | 2.5 m/s | 5.3 |
| 1989 | 19.4°C | 12.4°C | 5.4°C | 26.1°C | 0.4°C | 28 mm | 57% | 2.5 m/s | 5.2 |
| 1988 | 18.8°C | 12.2°C | 5.5°C | 27.4°C | -0.5°C | 34 mm | 57% | 2.4 m/s | 4.7 |
| 1987 | 20.3°C | 13.2°C | 6.0°C | 30.6°C | 0.6°C | 14 mm | 54% | 2.4 m/s | 5.4 |
| 1986 | 16.8°C | 10.0°C | 3.2°C | 26.7°C | 0.2°C | 8 mm | 56% | 2.4 m/s | 5.2 |
| 1985 | 18.5°C | 11.5°C | 4.5°C | 26.6°C | -2.7°C | 8 mm | 58% | 2.7 m/s | 5.4 |
| 1984 | 15.1°C | 9.0°C | 3.0°C | 25.5°C | 0.3°C | 30 mm | 63% | 2.6 m/s | 4.8 |
| 1983 | 17.1°C | 10.4°C | 3.8°C | 24.6°C | -1.6°C | 14 mm | 57% | 2.1 m/s | — |
| 1982 | 14.9°C | 8.2°C | 1.5°C | 25.0°C | -3.2°C | 27 mm | 59% | 2.6 m/s | — |
| 1981 | 17.3°C | 10.8°C | 4.3°C | 29.2°C | -2.2°C | 9 mm | 59% | 3 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 17.7°C with lows near 4.3°C (mean 11°C), based on 45 years of NASA POWER data.
April averages 21 mm of rainfall in Richland, about average for rainfall. The wettest on record was 43 mm in 1995.
The hottest April reached 31.9°C in 2012. The coldest dipped to -3.4°C in 1997.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 0.5°C. Daytime highs moved from 16.6°C to 17.4°C and overnight lows from 3.4°C to 3.6°C over the same span.
April is one of the cooler months of the year in Richland and about average for rainfall, so plan for around 17.7°C daytime highs and 4.3°C at night.
Not quite — April is the 6th coolest month in Richland, averaging 11°C.
For April in Richland, pack warm layers and a jacket for chilly mornings, with typical highs of 17.7°C and lows of 4.3°C.
Relative humidity in April averages 57% — moderately humid.
Average wind speed in April is 2.5 m/s. The windiest April on record averaged 3 m/s (1981).
The wettest April on record was 1995 with 43 mm. On average, April sees 21 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 Richland 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.
