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Sunshine Hours
How long has the sun been out today...
Traditionally, the World Meteorological
Organisation, WMO, defines a sunshine hour as “the sum of the time intervals (in
hours) during which the direct normal solar irradiance exceeds a threshold of
120 W/m2”. Recently, the WMO has approved the “pyranometric method” of
calculating sunshine duration from pyranometer measurements (WMO-No. 8, Guide to
Meteorological Instruments). Inside the Mountsorrel & Rothley Weather Station, a
software algorithm calculates sunshine hours by first calculating the 1-second
maximum potential solar radiation possible (clear sky, bright sun) based on the
time and location of the sun proximity to the weather station. If the weather
station' Pyranometer output is greater than 40% of the maximum potential direct solar radiation, then a sun second is recorded. These sun seconds are then totalled up to calculate sun hours per day.
Leicestershire averages 1364 hours of sun a year
Sunshine Hours by Month (2024) |
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| 2024 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | TOTAL(hrs) |
| JAN | 1.3 | 0.9 | 1.7 | 0.7 | 0.0 | 1.6 | 1.3 | 0.0 | 2.5 | 0.9 | 0.2 | 0.0 | 1.6 | 1.2 | 2.5 | 2.7 | 0.9 | 2.5 | 2.8 | 2.1 | 0.7 | 2.0 | 0.3 | 4.0 | 1.9 | 2.9 | 2.8 | 3.1 | 2.2 | 3.8 | 0.5 |
51.6
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| FEB | 3.4 | 4.1 | 1.2 | 0.8 | 2.1 | 2.1 | 1.2 | 0.0 | 0.6 | 1.5 | 1.0 | 5.3 | 0.1 | 1.6 | 1.5 | 3.6 | 3.2 | 5.5 | 3.2 | 2.7 | 0.1 | 1.7 | 3.9 | 6.9 | 6.9 | 3.2 | 5.7 | 2.5 | 0.0 | 0.0 | 0.0 |
75.6
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| MAR | 6.2 | 5.5 | 9.9 | 9.6 | 7.0 | 6.9 | 2.5 | 6.1 | 8.0 | 0.1 | 2.1 | 2.3 | 3.4 | 5.6 | 5.6 | 4.8 | 2.2 | 9.8 | 7.4 | 5.6 | 2.1 | 3.3 | 6.1 | 11.4 | 0.7 | 6.5 | 9.2 | 6.5 | 8.9 | 9.0 | 7.2 |
181.5
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| APR | 7.8 | 9.1 | 6.8 | 4.8 | 10.1 | 11.4 | 8.5 | 8.2 | 5.7 | 7.3 | 10.1 | 9.4 | 5.6 | 6.4 | 5.1 | 7.2 | 9.5 | 5.1 | 2.6 | 8.8 | 6.3 | 6.3 | 6.2 | 4.2 | 6.1 | 6.1 | 7.2 | 8.0 | 10.9 | 14.2 | 0.0 |
225.0
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| MAY | 8.0 | 8.8 | 4.5 | 6.9 | 6.9 | 7.1 | 7.1 | 6.5 | 12.5 | 14.1 | 12.7 | 10.8 | 12.0 | 8.2 | 1.9 | 7.7 | 7.4 | 4.4 | 11.7 | 9.4 | 7.1 | 2.0 | 5.3 | 1.2 | 9.2 | 4.7 | 5.4 | 5.8 | 7.0 | 4.1 | 5.3 |
225.7
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| JUN | 5.0 | 13.2 | 4.5 | 6.0 | 5.2 | 6.6 | 4.8 | 9.0 | 4.1 | 9.9 | 7.3 | 7.4 | 9.0 | 1.9 | 2.8 | 4.1 | 4.4 | 3.5 | 3.0 | 4.4 | 6.1 | 4.0 | 3.7 | 4.1 | 10.1 | 8.1 | 9.5 | 9.9 | 4.1 | 7.1 | 0.0 |
182.8
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| JUL | 3.4 | 5.7 | 6.8 | 10.7 | 3.4 | 4.7 | 8.3 | 10.1 | 4.2 | 8.6 | 7.6 | 9.1 | 3.1 | 5.9 | 2.4 | 0.3 | 4.6 | 6.8 | 5.6 | 0.5 | 4.8 | 2.5 | 3.1 | 2.4 | 0.6 | 4.1 | 3.6 | 5.6 | 7.1 | 5.3 | 6.7 |
157.6
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| AUG | 3.9 | 5.7 | 1.8 | 0.7 | 0.4 | 2.2 | 1.9 | 2.0 | 4.7 | 1.3 | 6.2 | 4.6 | 6.3 | 0.3 | 1.4 | 5.7 | 2.3 | 3.5 | 0.9 | 4.0 | 2.7 | 1.0 | 3.5 | 0.9 | 2.9 | 2.9 | 0.7 | 1.0 | 3.9 | 4.1 | 3.0 |
86.4
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| SEP | 1.7 | 0.2 | 0.4 | 1.9 | 0.0 | 2.7 | 0.0 | 2.7 | 0.7 | 0.5 | 1.8 | 2.7 | 3.3 | 3.6 | 1.6 | 4.4 | 2.2 | 0.7 | 0.3 | 0.1 | 2.2 | 0.0 | 0.0 | 1.9 | 2.3 | 1.4 | 0.7 | 3.4 | 0.4 | 0.0 | 0.0 |
43.8
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| OCT | 0.0 | 0.1 | 3.2 | 2.7 | 1.9 | 0.1 | 2.0 | 1.1 | 0.8 | 1.4 | 3.0 | 0.8 | 1.6 | 0.0 | 0.0 | 0.0 | 2.9 | 1.1 | 0.9 | 0.0 | 0.0 | 1.2 | 1.1 | 1.1 | 0.0 | 0.4 | 2.7 | 0.3 | 0.1 | 0.0 | 0.0 |
30.5
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| NOV | 0.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.1 | 0.0 | 2.1 | 1.2 | 0.7 | 0.5 | 1.0 | 0.8 | 0.0 | 1.2 | 0.0 | 1.5 | 0.0 | 0.0 | 1.5 | 1.3 | 0.2 | 0.9 | 0.3 | 0.0 | 0.0 |
14.6
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| DEC | 0.0 | 0.0 | 0.2 | 0.1 | 0.0 | 0.9 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 0.1 | 0.5 | 0.0 | 0.0 | 0.4 | 0.4 | 0.1 | 0.5 | 0.0 | 0.1 | 0.3 | 0.0 | 0.0 | 0.0 | 0.2 | 0.4 | 0.1 |
5.3
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Sunshine Hours by Year |
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| YEAR | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | TOTAL(hrs) |
| 2025 | 20.0 | 28.5 | 100.1 | 149.4 | 133.4 | 78.0 | 64.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
573.8
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| 2024 | 31.6 | 47.1 | 81.4 | 75.6 | 92.3 | 104.8 | 93.2 | 86.4 | 43.8 | 30.5 | 14.6 | 5.3 |
706.6
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| 2023 | 34.2 | 71.9 | 65.4 | 148.3 | 184.1 | 214.4 | 136.4 | 158.6 | 126.7 | 68.6 | 42.4 | 9.6 |
1260.6
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| 2022 | 31.9 | 46.9 | 133.6 | 172.3 | 168.4 | 173.9 | 192.1 | 211.4 | 93.8 | 85.4 | 23.5 | 17.4 |
1350.6
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| 2021 | 18.8 | 61.0 | 82.1 | 210.1 | 149.9 | 170.4 | 135.4 | 93.0 | 100.7 | 63.4 | 28.0 | 6.1 |
1118.9
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| 2020 | 29.2 | 69.8 | 133.8 | 232.5 | 258.3 | 152.7 | 149.5 | 143.2 | 156.3 | 44.0 | 34.5 | 14.6 |
1418.4
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| 2019 | 0.0 | 0.0 | 0.0 | 134.4 | 148.1 | 120.2 | 151.1 | 172.0 | 141.9 | 76.4 | 24.5 | 19.5 |
988.1
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Outlook for Wednesday to Friday: A fair bit of dry weather is probable, but with the risk of some outbreaks of rain or showers at times. Temperatures likely above average.
UK Outlook for Friday 18 Jul 2025 to Sunday 27 Jul 2025: Weather conditions are expected to be changeable overall across the UK during this forecast period, which probably will start unsettled across the UK, before probably transforming into something a bit more settled after the first weekend. Any settled spells could persist for several days at a time and are likely to be accompanied by plenty of sunshine. Interspersed with this will be cloudier, more unsettled intervals which will bring some showers or longer spells of persistent rainfall. Some of the rainfall is likely to be heavy in places, with a risk thunderstorms at times as well. Temperatures are expected to be above normal for the majority of the UK throughout this period. Some hot conditions are likely to develop at times, particularly in southern and eastern areas of the UK.
Mountsorrel is a village in Leicestershire on the River Soar, just south of Loughborough with a population of 6,662 inhabitants. A castle was built in 1080 by Hugh Lupus, but there is evidence of an earlier Norman settlement in the area in the form
of pottery fragments. A Roman villa is supposed to have existed on Broad Hill during the 4th century AD, the site of today's quarry, as quarrying during the late 1800s revealed many artefacts including a preserved wooden bucket. However, the first recording of the village was in 1377, when it had a population of 156.
The Mountsorrel Weather Station is located in Mountsorrel which is just South of Loughborough andjust North of Leicester, Leicestershire.
This website is non for profit and is freely maintained by Stormchaser Stuart Robinson whose passion is for all type of weather but especially the more severe types of weather such as Hurricanes, Typhoons and Tornadoes.
Stuart oftens travels the globle to experabce severe weather first after seeing his first tornado outside a town called Stuart in Nebraska, USA on the 9th June 2003.