May 1999
Date Time T RH Tmax Tmin T1 T10 T30 T50 MSLP Rain Gust Weather
01/05/99 18 19.5 48 21.0 4.7 16.4 14.6 12.0 11.2 1018 0.0 9 Early sun then cloudy. 02/05/99 21 15.0 69 21.2 10.2 14.3 14.7 13.0 11.7 1018 0.0 7 Mainly sunny. 03/05/99 17 21.3 40 22.2 5.7 17.5 14.9 13.6 11.8 1019 0.0 9 Sunny. 04/05/99 17 15.9 50 21.1 8.4 15.4 14.4 12.8 11.9 1012 0.0 13 Sunny periods AM then becoming cloudy. 05/05/99 18 13.7 84 17.6 8.2 14.1 13.7 12.5 11.9 1009 0.5 18 Sunny periods AM. Outbreaks rain late PM. 06/05/99 18 18.3 52 18.5 9.2 16.2 14.0 12.5 11.8 1013 0.1 9 Cloudy AM then sunny spells. 07/05/99 18 15.1 72 18.3 4.9 14.7 13.1 12.2 11.6 1005 9.7 8 Cloudy. Showery rain. 08/05/99 18 13.6 87 15.1 8.0 12.8 12.5 12.3 11.6 1010 2.8 14 Cloudy. Showery rain. Dry evening. 09/05/99 18 18.7 50 20.2 12.0 17.0 15.2 12.4 11.7 1010 0.0 11 Rather cloudy. Sunny spells. 10/05/99 17 16.3 65 18.7 11.3 16.0 14.7 13.0 12.3 1008 3.0 20 Sunny spells with a few showers. 11/05/99 17 17.0 55 18.0 11.0 16.2 14.9 13.0 12.3 1008 0.0 18 Sunny spells. 12/05/99 17 15.0 62 17.1 9.7 14.8 14.0 13.0 12.3 1009 1.1 14 Mainly cloudy with showers. 13/05/99 18 14.2 68 17.9 8.9 14.0 13.6 12.8 12.3 1007 4.0 15 Showers. Sunny intervals. 14/05/99 18 18.0 54 18.0 9.7 16.3 14.6 12.9 12.2 1010 1.6 5 Sunny spells and showers. Fine evening. 15/05/99 18 14.3 60 17.9 8.7 14.3 13.7 12.8 12.3 1020 1.0 4 Mainly cloudy. Occasional light rain. 16/05/99 18 14.5 47 15.8 4.2 14.0 13.4 12.5 12.1 1022 0.0 3 Sunny intervals. 17/05/99 17 14.6 50 14.9 6.2 13.6 12.6 12.2 11.9 1016 0.0 14 Sunny spells. Windy. 18/05/99 18 14.1 81 14.8 9.7 13.4 12.2 12.2 11.8 1012 2.6 11 Rain AM then cloudy. 19/05/99 19 14.1 87 23.3 9.0 14.8 15.3 13.0 11.8 1010 15.2 17 Sunny AM. Increasing cloud. Thunderstorm 1630-1830. Heavy rain. Frequent lightning 1700-1800 (>10 flashes per minute). 25% of strokes cloud to ground. Cloudy thereafter. 20/05/99 18 21.2 52 23.4 8.2 19.2 17.2 13.4 12.4 1013 0.1 7 Sunny periods. 21/05/99 18 15.9 75 21.2 8.8 15.0 14.7 13.8 12.8 1013 0.0 13 Becoming cloudy. Light rain in evening. 22/05/99 18 16.0 46 17.5 7.0 14.4 14.6 13.2 12.6 1019 0.0 13 Sunny periods. 23/05/99 18 16.2 71 18.8 9.4 15.9 15.0 13.3 12.8 1018 0.0 11 Cloudy with sunny intervals. 24/05/99 18 17.4 67 19.0 11.2 16.2 15.2 13.6 12.9 1017 0.0 10 Increasing cloud. Outbreaks rain in evening. 25/05/99 18 18.3 45 18.8 7.3 17.4 16.2 13.3 12.8 1020 0.7 9 Sunny periods. 26/05/99 17 19.2 55 21.7 5.5 18.2 16.3 13.9 12.9 1018 0.0 7 Sunny periods AM then becoming cloudy. 27/05/99 18 24.3 39 26.4 7.2 21.3 18.5 14.6 13.3 1012 0.0 11 Sunny. Becoming cloudy in afternoon. Slight rain in evening. 28/05/99 18 20.6 52 24.3 14.7 19.8 18.3 15.4 14.1 1019 0.0 14 Early drizzle then sunny periods. 29/05/99 18 17.6 85 24.8 9.4 18.3 18.0 15.6 14.2 1014 13.1 12 Sunny periods. Thunderstorm in late afternoon with small hail. 30/05/99 18 11.5 92 18.3 11.0 13.8 14.8 15.0 14.3 1019 0.2 5 Cloudy with occasional light rain. 31/05/99 16.4 9.6 0.0 (Observer away from site)
Days marked in bold are when severe weather occurred.
Summary
Highest day max 26.4 27th Lowest day max 14.8 18th Lowest night min 4.2 16th Highest night min 14.7 28th Mean day max 19.4 Mean night min 8.7 Mean temperature 14.1
Total rainfall 55.7 Highest daily total 15.2 19th No. rain days (>= 0.2) 13 No. wet days (>= 1.0) 11 Mean pressure 1014 Highest value read 1022 16th Lowest value read 1005 7th
Mean RH 62%
Mean 10 cm earth temperature 14.8 Mean 30 cm earth temperature 13.2 Mean 50 cm earth temperature 12.4
No. days with air frost 0 No. days with thunder 2 No. days with snow 0 No. days with sleet 0 No. days with hail < 0.5 cm 1 No. days with hail >=0.5 cm 0
Max snow depth N/A Max. wind gust (corrected to 10m) 28 mph 10th
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