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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
Recorded
Sunshine Hours by Month (2021) |
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| 2021 | 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) |
| JUN | 11.3 | 9.4 | 6.0 | 3.2 | 11.3 | 4.0 | 5.5 | 13.0 | 10.4 | 2.6 | 4.4 | 6.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
87.4
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| MAY | 5.0 | 5.8 | 0.8 | 3.7 | 9.3 | 6.6 | 5.8 | 0.0 | 5.2 | 5.2 | 4.3 | 7.9 | 2.1 | 0.8 | 1.2 | 4.9 | 4.8 | 5.2 | 9.1 | 0.1 | 0.3 | 3.1 | 3.7 | 5.2 | 5.0 | 3.1 | 5.0 | 9.0 | 8.3 | 10.7 | 8.7 |
149.9
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| APR | 0.4 | 2.8 | 3.2 | 10.6 | 7.0 | 7.8 | 5.0 | 4.0 | 0.5 | 3.7 | 6.3 | 9.0 | 9.2 | 8.6 | 6.8 | 3.8 | 11.7 | 11.6 | 12.3 | 8.7 | 6.2 | 12.3 | 11.8 | 11.8 | 7.5 | 10.1 | 0.3 | 5.1 | 5.1 | 6.9 | 0.0 |
210.1
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| MAR | 0.0 | 0.0 | 0.0 | 0.3 | 0.1 | 0.0 | 5.5 | 2.0 | 4.0 | 0.0 | 3.9 | 4.8 | 2.9 | 1.4 | 1.9 | 1.5 | 3.0 | 1.3 | 0.2 | 0.5 | 3.2 | 2.6 | 1.9 | 4.6 | 5.5 | 2.6 | 3.7 | 0.7 | 5.0 | 9.6 | 9.4 |
82.1
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| FEB | 2.9 | 0.5 | 0.1 | 0.2 | 0.9 | 0.8 | 0.1 | 0.9 | 1.9 | 4.3 | 4.7 | 2.9 | 3.8 | 0.0 | 2.3 | 0.6 | 1.6 | 2.7 | 0.0 | 0.1 | 0.7 | 0.8 | 2.9 | 2.3 | 4.5 | 5.5 | 6.2 | 6.8 | 0.0 | 0.0 | 0.0 |
61.0
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| JAN | 0.2 | 1.1 | 0.3 | 0.5 | 2.0 | 0.3 | 1.7 | 0.0 | 0.1 | 0.5 | 0.1 | 0.2 | 0.0 | 0.0 | 0.0 | 0.1 | 1.7 | 0.0 | 0.0 | 0.0 | 1.1 | 2.2 | 1.0 | 0.0 | 2.1 | 0.3 | 0.2 | 0.8 | 1.2 | 0.0 | 1.1 |
18.8
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Recordred Sunshine Hours by Year |
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| YEAR | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | DEC | TOTAL(hrs) |
| 2021 | 18.8 | 61.0 | 82.1 | 210.1 | 149.9 | 87.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 |
609.3
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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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UK Outlook for Thursday 17 Jun 2021 to Saturday 26 Jun 2021: Likely remaining warm, perhaps very warm and humid towards the southeast at first with the risk of thundery showers across central and south-eastern areas. Elsewhere sunny spells and fresher, with some rain and thicker cloud towards the north and west at times. The fresher air is then likely to gradually spread to the rest of the country bringing a change to widely cooler more changeable conditions towards the end of the week, with a low risk of warm and humid air returning to the far southeast at times. This will likely bring occasional spells of rain or showers interspersed with drier and sunnier conditions. Overall, temperatures will likely average out to be close to normal.
UK Outlook for Saturday 26 Jun 2021 to Saturday 10 Jul 2021: Low confidence through this period due to mixed and weak signals. However, a west to south-westerly direction is most likely. This would favour occasional spells of warm to very warm conditions, with hot conditions probable at times towards the southeast. This may bring the possibility of thunderstorms in the east to southeast. Overall, rainfall amounts will likely be close to average for the time of the year.
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.