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Annual Review of Weymouth's weather 2013

The 30-year period of averages currently in use by the Meteorological Office is 1981 to 2010.

All data is recorded using standard Meteorological Office equipment, thermometers that are tested and certified, rain gauges and sun recorders, set on a standard site inspected by the meteorological office. On any one day the temperature, rainfall and sunshine in different parts of the Borough can vary greatly, readings are often queried by people using untested and improperly installed equipment.

The temperatures below are the monthly averages, specific daily data can be found on the What was it like page.

The Met Office divides the year up into precise 3 monthly periods:

Summary

January Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 75.9 67.2 8.6 4.0 Lowest sun since 2002 .The greatest rainfall was 28.1 mm on Tuesday 22nd. Eighth consecutive month that has seen more than the monthly average rainfall Rain fell on 19 days; hail fell on 28th, snow on 16th and 18th.
2013 133.4 50.6 8.2 4.1

February Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 57.9 89.5 8.5 3.4 Coldest February since 2006. Ground Frost was recorded on 13 occasions; lowest reading was minus 5.0 degrees on Sunday 3rd. Hail Saturday and Sunday 23rd and 24th. Ground Frost was recorded on 13 occasions; lowest reading was minus 5.0 degrees on Sunday 3rd.
2013 40.3 83.3 7.2 2.6

End of winter: Rainfall 343.4mm, 154% of the 30-year average, wettest winter since 1995. Sunshine 211.0 hours, 102.0% of the 30-year average. Temperatures were very close to the seasonal average.


March Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 61.8 128.7 10.3 4.7 Coldest March since 1880 and the wettest since 2001. Least amount of sunshine since 1984. Flakes of snow 0920 on Thursday 17th and at 0630 and 1900 on Wednesday 27th.
2013 109.6 84.0 7.4 2.1

April Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 49.4 196.3 12.5 5.7 Joint second coldest April with 1978, and the lowest Maximum average since 1986 which was just 9.6oC; and the lowest minimum temperatures since 1990, Snow flakes 1620 on April 4th.
2013 49.5 184.1 10.9 4.7

May Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 46.4 223.6 15.5 8.8 May turned out to be an average month, except for the persistent wind. No huge gusts, but the wind was there all the time lowering the warm feeling that the sunshine promised.
2013 48.5 233.5 14.6 7.8

End of Spring; Sunshine 94% and rainfall 132% of seasonal average, Temperatures: Maximum 1.7oC below and Minimum 1.5oC below seasonal average.


June Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 45.3 225.3 18.0 11.0 Lowest June rainfall for ten years and just 20% of 2012's record rainfall
2013 23.8 232.6 17.8 11.3

July Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 37.1 239.2 20.2 13.0 First 3 weeks dry, last 10 days saw a month's average rainfall. Sunshine 24% up on the average.
2013 45.0 297.2 21.6 14.4

August Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 47.8 219.6 20.3 13.8 Another nice sunny month, sunniest August for 6 years. Slightly below average rainfall
2013 34.5 257.8 21.1 14.4

End of Summer; Sunshine 119% and Rainfall just below the seasonal average. Minimum temperature was 0.8oC and Maximum temperature 0.7oC above seasonal average. Driest and warmest summer since 2006.


September Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 56.4 171.6 18.5 12.2 A dry month and quite warm month with a disappointing amount of sunshine.
2013 25.9 139.0 18.9 12.4

October Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 85.1 123.9 15.2 9.9 Average October until the wrath of St. Jude descended gusts between 29 and 69 MPH during the last week.
2013 129.3 136.2 17.0 12.3

November Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 93.1 85.8 11.9 6.8 A little on the cool side but all in all a very nice month. Air frost was recorded on Wednesday 20th and there were 9 occasions of ground frost.
2013 51.9 102.0 11.4 6.1

End of Autumn: Sunshine slightly above average, Rainfall slightly below the seasonal average, Minimum temperature was 0.7oC and Maximum temperature 0.8oC above seasonal average.


December Rainfall mm Sunshine Hrs. Maximum oC Minimum oC Notes
30 year average 88.6 63.6 9.1 4.3 A very wet month wettest since 1989, and as with last year one of the warmest Decembers on record, 1 air frost, but 11 ground frosts very windy, also Lightning, thunder and hail.
2013 169.3 62.9 11.1 6.4

Sunshine

The average annual sunshine is 1855 hours 18 minutes, 2013 saw an increase in sunshine in a year that was pretty bad all over the country recording 1863 hours and 12 minutes, the sunniest day was 14th June with 14 hours and 42 minutes.

Rainfall

The average annual rainfall in Weymouth is 744.8 millimetres, 2013 saw a 17% increase (124.4 mm) above the 30-year average, recording a total of 869.2mm. June and September were all drier than average. January, March October and December were well above their averages, making this a wet year, but falling well below the 2012 total of 1133.5mm.

Wind

The prevailing wind for Weymouth is from the southwest, 119 days the wind came from the southwest quadrant, 56 days came from the southeast quarter, 108 from the northeast direction, 71 from the northwest and 11 days were calm at the 0900 observation. Gale force winds, i.e. wind at a speed of 34 knots or more, for a period of 10 minutes, or for gust exceeding 43 knots occurred on 27 occasions, gusts occurred more frequently but not for extended periods. The highest being 69 knots on 27th October.

Temperatures

Average Max
2013 was an average year for temperature with both the Maximum and Minimum. The warmest day was 8th July at 25.8oC.

Average Min
October and December were over 2 degrees above the 30-year average, whilst March was the coldest month; the highest minimum temperature was on 22nd July at 17.5oC.

Air frost

The air temperature dropped to zero or below on 18 days, most of these were in March. Lowest air temperature was -2.6oC on 12th March.

Ground frost

Occurred on 70 occasions throughout the year, January 16 times, February 17 times, March 14 times, and April 9 times, 9 in November, and on 5 occasions during December, the lowest ground temperature was -5.0oC on 21st January.

Sea

The sea temperature is measured in Weymouth Bay from the Pleasure Pier, (and is mainly recorded for the convenience of the bathers, whether they be local or visitors), the temperature of the water in the bay varies considerably from day to day depending on tide and wind, the rate of cooling and warming is a lot slower that of the air temperature, and in the winter is often a lot warmer than the air temperature. The temperature is measured 1 metre below the surface. The sea temperature was mainly below the 30-year average, from 4o in April to 18.5oC on 5th September.

Thunder

5 occurrences of thunder were recorded, 12th January, 21st July, 7th September, 19th October and 25th December.

Hail

Hail was recorded 4 times 12th January, 16th March, 16th September, and 25th December.

Snow

Snow, a rare phenomenon in Weymouth saw light flakes on 16th and 18th January, March 10th, 11th, 26th and 27th, and April 4th.

Fog

Fog is 'wet air', not to be confused with haze, which is 'dirty but dry air'. When assessing visibility, fog reduces visibility to 1000 metres, whilst thick fog brings visibility down to 400 metres. Fog was observed on 24th and 25th April, 6th May, 20th and 26th June, 31st July, 4th , 24th and 26th September, Mist and haze was present on several occasions during the year.

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