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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 | 2.8 | 2.9 | 0.1 | 1.3 | 3.6 | 6.8 | 0.0 |
190.0
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| MAY | 1.3 | 4.4 | 0.0 | 4.2 | 3.5 | 4.7 | 2.7 | 6.3 | 6.0 | 7.3 | 5.7 | 3.7 | 3.8 | 0.6 | 1.7 | 0.0 | 3.8 | 2.0 | 7.7 | 4.1 | 0.1 | 0.4 | 0.0 | 0.6 | 5.9 | 2.8 | 4.3 | 1.8 | 1.8 | 0.9 | 0.2 |
92.3
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| JUN | 1.0 | 8.0 | 1.3 | 0.7 | 3.9 | 3.3 | 3.3 | 4.8 | 2.2 | 3.4 | 1.3 | 2.2 | 2.3 | 1.9 | 2.8 | 4.1 | 4.4 | 3.5 | 3.0 | 4.4 | 6.1 | 4.0 | 3.7 | 4.1 | 6.3 | 5.9 | 4.2 | 4.4 | 3.4 | 0.9 | 0.0 |
104.8
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| JUL | 1.3 | 1.7 | 1.2 | 5.1 | 2.4 | 2.7 | 4.1 | 2.9 | 0.1 | 1.1 | 0.0 | 2.0 | 1.1 | 1.5 | 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 |
93.2
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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 | 114.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
263.0
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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 Sunday to Tuesday: Dry and sunny conditions will persist through this period, accompanied by light winds. Temperatures are expected to rise steadily each day, becoming widely warm across the region.
UK Outlook for Tuesday 29 Apr 2025 to Thursday 8 May 2025: Widely fine and dry across the majority of the UK for the first couple of days of this forecast period. Clear or sunny spells are likely across most regions, although the north and northwest of Scotland and Northern Ireland could be cloudier with a little light rain or drizzle at times. Into early May, it will probably begin to turn more changeable, with dry, settled periods interspersed with some spells of unsettled weather. This will bring some showers or longer spells of rain at times, which could be heavy and thundery in places. Temperatures are likely to be widely above average to begin with, but will probably fall nearer normal as we move into early May.
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.