April is one of the cooler months of the year in Sleaford, with average highs near 12.7°C and lows around 3.7°C (mean 8.2°C). It is about average for rainfall, averaging 50 mm of rainfall and 82% relative humidity across the period.
April is one of the cooler months of the year in Sleaford. Across 45 years of records, the warmest April in Sleaford was 2011 — when the month averaged 11.4°C — while the coldest was 1986 at 5.2°C. Typical April days reach 12.7°C with nights near 3.7°C. The long-term trend is warming, about 0.4°C per decade.
April is about average for rainfall in Sleaford, averaging 50 mm of rainfall. The wettest April on record was 2012 with 132 mm, while the driest was 2011 at 9 mm.
Relative humidity in Sleaford during April averages 82%. The most humid April was 2018 at 86%, and the least humid was 2021 at 78%.
April receives about 3.9 kWh/m²/day of solar energy in Sleaford. The sunniest April was 2025 at 4.9 kWh/m²/day, and the cloudiest was 1993 at 3.1.
Average wind speed in Sleaford during April is 3.3 m/s. The windiest Aprils were 1991 and 1994 at 4.2 m/s, while the calmest was 2021 at 2.6 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 7.2°C | 8.2°C | 8.5°C | 8.5°C | 8.6°C | +1.4°C |
| Avg High | 11.5°C | 12.6°C | 13.0°C | 13.2°C | 13.4°C | +1.9°C |
| Avg Low | 2.8°C | 3.8°C | 4.1°C | 3.9°C | 3.7°C | +0.9°C |
| Avg Rain | 58 mm | 51 mm | 56 mm | 43 mm | 34 mm | -24 mm |
April temperatures in Sleaford have risen by about 1.2°C between 1981–1985 and 2021–2025.
April has ranged from a record low of -3.8°C (1990) to a record high of 24.5°C (2018).
Rainfall in April is about average for rainfall, averaging 50 mm, with a wettest year of 132 mm.
Daytime highs and overnight lows have shifted differently — highs rose about 0.5°C per decade while lows rose 0.2°C per decade, widening the gap between day and night.
A good time to visit Sleaford
April is a good time to visit Sleaford, with days averaging 12.7°C and nights around 3.7°C (mean 8.2°C, cooler than Sleaford's yearly average) and moderate rainfall. July 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 | 15.5°C | 10.1°C | 4.7°C | 22.0°C | 0.7°C | 20 mm | 80% | 2.7 m/s | 4.9 |
| 2024 | 12.9°C | 8.9°C | 4.9°C | 18.9°C | 0.3°C | 65 mm | 83% | 4.1 m/s | 3.8 |
| 2023 | 12.8°C | 8.3°C | 3.7°C | 17.1°C | -2.3°C | 64 mm | 81% | 3.2 m/s | 3.9 |
| 2022 | 13.7°C | 8.9°C | 4.1°C | 19.7°C | -2.5°C | 17 mm | 79% | 3.4 m/s | 4.3 |
| 2021 | 10.8°C | 5.6°C | 0.4°C | 15.6°C | -3.1°C | 17 mm | 78% | 2.6 m/s | 4.6 |
| 2020 | 14.8°C | 9.6°C | 4.5°C | 21.0°C | 0.8°C | 23 mm | 80% | 2.9 m/s | 4.7 |
| 2019 | 14.0°C | 8.7°C | 3.4°C | 20.8°C | -1.2°C | 19 mm | 80% | 3.1 m/s | 4.2 |
| 2018 | 13.3°C | 9.3°C | 5.4°C | 24.5°C | 0.0°C | 86 mm | 86% | 3.5 m/s | 3.2 |
| 2017 | 13.4°C | 8.5°C | 3.6°C | 21.6°C | -1.2°C | 19 mm | 80% | 3.1 m/s | 4 |
| 2016 | 11.3°C | 6.9°C | 2.5°C | 14.6°C | -2.0°C | 63 mm | 82% | 3.1 m/s | 4.1 |
| 2015 | 13.8°C | 8.6°C | 3.5°C | 18.1°C | -0.8°C | 21 mm | 79% | 2.9 m/s | 4.7 |
| 2014 | 14.5°C | 9.9°C | 5.4°C | 17.4°C | 0.3°C | 35 mm | 84% | 3.1 m/s | 3.7 |
| 2013 | 11.1°C | 6.6°C | 2.0°C | 17.9°C | -3.2°C | 19 mm | 81% | 3.8 m/s | 4 |
| 2012 🌧️ | 10.7°C | 6.9°C | 3.1°C | 17.4°C | -2.3°C | 132 mm | 83% | 3.4 m/s | 3.4 |
| 2011 🔥 | 16.7°C | 11.4°C | 6.1°C | 23.6°C | 3.1°C | 9 mm | 80% | 3 m/s | 4.4 |
| 2010 | 13.4°C | 8.4°C | 3.5°C | 19.2°C | -0.1°C | 32 mm | 82% | 2.8 m/s | 4.4 |
| 2009 | 14.3°C | 9.5°C | 4.7°C | 17.9°C | 1.0°C | 29 mm | 84% | 2.8 m/s | 4 |
| 2008 | 11.3°C | 7.3°C | 3.4°C | 19.0°C | -1.8°C | 56 mm | 85% | 3.4 m/s | 3.7 |
| 2007 | 15.9°C | 10.8°C | 5.8°C | 21.4°C | 2.6°C | 11 mm | 82% | 2.9 m/s | 4.5 |
| 2006 | 12.2°C | 7.8°C | 3.3°C | 16.9°C | -2.8°C | 41 mm | 82% | 3.3 m/s | 3.7 |
| 2005 | 13.0°C | 8.5°C | 4.0°C | 18.7°C | -1.4°C | 50 mm | 82% | 3.3 m/s | 3.8 |
| 2004 | 13.8°C | 9.5°C | 5.2°C | 20.5°C | 1.6°C | 91 mm | 84% | 3.2 m/s | 3.6 |
| 2003 | 13.6°C | 8.7°C | 3.8°C | 22.6°C | -2.9°C | 40 mm | 83% | 3.2 m/s | 3.9 |
| 2002 | 13.6°C | 8.7°C | 3.8°C | 19.7°C | -0.8°C | 32 mm | 81% | 3.2 m/s | 4.2 |
| 2001 | 10.7°C | 6.6°C | 2.6°C | 18.4°C | -0.3°C | 81 mm | 86% | 3.5 m/s | 3.3 |
| 2000 | 11.7°C | 7.8°C | 4.0°C | 16.8°C | -1.3°C | 128 mm | 85% | 3.2 m/s | 3.4 |
| 1999 | 13.1°C | 8.9°C | 4.8°C | 18.6°C | -2.9°C | 62 mm | 84% | 3.3 m/s | 3.8 |
| 1998 | 10.9°C | 7.4°C | 3.8°C | 18.3°C | -1.4°C | 101 mm | 86% | 3.6 m/s | 3.3 |
| 1997 | 13.3°C | 8.4°C | 3.5°C | 18.2°C | -2.3°C | 31 mm | 79% | 3.1 m/s | 3.7 |
| 1996 | 12.5°C | 7.8°C | 3.1°C | 21.0°C | -3.5°C | 31 mm | 82% | 2.9 m/s | 3.6 |
| 1995 | 13.1°C | 8.4°C | 3.7°C | 18.4°C | -1.8°C | 22 mm | 82% | 3.3 m/s | 3.7 |
| 1994 | 11.6°C | 7.5°C | 3.5°C | 21.3°C | -0.5°C | 56 mm | 82% | 4.2 m/s | 3.8 |
| 1993 | 13.5°C | 9.4°C | 5.2°C | 21.6°C | 0.9°C | 91 mm | 83% | 3.4 m/s | 3.1 |
| 1992 | 12.8°C | 8.5°C | 4.3°C | 18.0°C | -0.3°C | 39 mm | 79% | 3.9 m/s | 3.5 |
| 1991 | 12.1°C | 7.6°C | 3.1°C | 19.6°C | -0.3°C | 48 mm | 80% | 4.2 m/s | 3.5 |
| 1990 | 12.9°C | 7.8°C | 2.7°C | 21.7°C | -3.8°C | 25 mm | 79% | 3.4 m/s | 4.2 |
| 1989 | 9.9°C | 5.9°C | 1.9°C | 14.6°C | -2.9°C | 90 mm | 83% | 3.4 m/s | 3.2 |
| 1988 | 12.2°C | 7.7°C | 3.2°C | 18.6°C | -2.3°C | 37 mm | 84% | 2.9 m/s | 3.4 |
| 1987 | 14.4°C | 9.6°C | 4.9°C | 20.1°C | 0.7°C | 60 mm | 85% | 3.1 m/s | 3.5 |
| 1986 ❄️ | 9.1°C | 5.2°C | 1.3°C | 14.9°C | -1.7°C | 79 mm | 85% | 3.3 m/s | 3.3 |
| 1985 | 11.9°C | 7.7°C | 3.6°C | 18.2°C | -3.4°C | 62 mm | 82% | 4 m/s | 3.4 |
| 1984 | 12.4°C | 7.2°C | 1.9°C | 19.4°C | -2.4°C | 13 mm | 81% | 2.8 m/s | 4.5 |
| 1983 | 10.3°C | 6.2°C | 2.1°C | 14.7°C | -2.0°C | 83 mm | 85% | 3.2 m/s | — |
| 1982 | 12.4°C | 7.8°C | 3.3°C | 16.3°C | -2.6°C | 18 mm | 83% | 2.8 m/s | — |
| 1981 | 11.1°C | 7.2°C | 3.3°C | 18.8°C | -2.5°C | 86 mm | 85% | 3.5 m/s | — |
Actual recorded April data for each year, 1981–2025 — sourced from NASA POWER.
The average high in April is around 12.7°C with lows near 3.7°C (mean 8.2°C), based on 45 years of NASA POWER data.
April averages 50 mm of rainfall in Sleaford, about average for rainfall. The wettest on record was 132 mm in 2012.
The hottest April reached 24.5°C in 2018. The coldest dipped to -3.8°C in 1990.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average April temperatures have risen by about 1.2°C. Daytime highs moved from 11.6°C to 13.1°C and overnight lows from 2.8°C to 3.6°C over the same span.
April is one of the cooler months of the year in Sleaford and about average for rainfall, so plan for around 12.7°C daytime highs and 3.7°C at night.
Not quite — April is the 6th coolest month in Sleaford, averaging 8.2°C.
For April in Sleaford, pack warm layers and a jacket for chilly mornings, with typical highs of 12.7°C and lows of 3.7°C.
Relative humidity in April averages 82% — quite humid.
Average wind speed in April is 3.3 m/s. The windiest April on record averaged 4.2 m/s (1991).
The wettest April on record was 2012 with 132 mm. On average, April sees 50 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 Sleaford 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.
