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    DATA QUALITY AND SUMMARY STATISTICS METEOROLOGICAL DATA Annual Report 2014 This report complements the data available on the data portal and is designed to help users by giving an overview of the quality and key statistics of the meterological data. Report produced on: 13 October 2020 Compiled by: Jane Hawkins using R version 3.6.1 (2019‐07‐05) Data version: 3 Data release date: 14 November 2018


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    Table of Contents Table of Contents 1 15 MINUTE METEOROLOGICAL DATA 1 1.1 Missing values table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Timesteps of missing 15 minute data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.3 Histograms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.4 Time series . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 MONTHLY SUMMARY STATISTICS 4 2.1 Table of statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Graphical summaries and comparison with 30 year meteorological means where data are available . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.1 Precipitation ‐ total . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2.2 Air temperature ‐ minimum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.2.3 Air temperature ‐ maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2.4 Air temperature ‐ mean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.2.5 Relative humidity ‐ mean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2.6 Solar radiation ‐ maximum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.2.7 Windspeed ‐ mean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 2.2.8 Windrose ‐ wind speed and direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 2.3 Calculated monthly variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.3.1 Number of days rainfall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.3.2 Days of air frost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3 ANNUAL SUMMARY STATISTICS 15 3.1 Table of statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15


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    List of Figures 4 APPENDIX 16 4.1 30 year meteorological means (1981‐2010) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 List of Tables 1 Total number of missing values (out of 35039) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Monthly summary statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Summary statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4 30 year meteorological means ‐ Crown copyright Met Office . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 List of Figures 1 Timestamps of missing 15 minute data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Histogram showing distribution of 15 minute data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3 Time series: precipitation, air temperature, relative humidity, solar radiation, wind speed and wind direction . . . . . . . . . . . . . . . . . . . . . . 3 4 Total precipitation and comparison with 30 year mean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 Minimum air temperature and comparison with 30 year mean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 6 Maximum air temperature and comparison with 30 year mean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 7 Mean relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 8 Mean relative humidity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 9 Maximum solar radiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 10 Mean windspeed and comparison with 30 year mean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 11 Windrose plots for wind speed and wind direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 12 Number of days with rainfall and comparison with 30 year mean. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 13 Number of days with air frost and comparison with 30 year mean . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 1 15 MINUTE METEOROLOGICAL DATA 1 15 MINUTE METEOROLOGICAL DATA 1.1 Missing values table Variable Precipitation Air Temperature Relative Humidity Windspeed Wind Direction Solar Radiation 1002 18 18 1459 1459 18 Table 1: Total number of missing values (out of 35039) 1.2 Timesteps of missing 15 minute data Colour bars represent missing data. Figure 1: Timestamps of missing 15 minute data Page 1 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 1 15 MINUTE METEOROLOGICAL DATA 1.3 Histograms Figure 2: Histogram showing distribution of 15 minute data Page 2 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 1 15 MINUTE METEOROLOGICAL DATA 1.4 Time series Figure 3: Time series: precipitation, air temperature, relative humidity, solar radiation, wind speed and wind direction Page 3 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2 MONTHLY SUMMARY STATISTICS Please be aware that statistics are based on data that may contain missing values. Full data summaries are available on request. 2.1 Table of statistics Total Precipitation Precipitation Days Min Temp Max Temp Mean Temp Mean Relative Humidity Mean Windspeed Mean Wind Direction Mean Solar Radiation Month (mm) (days) (0 C) (0 C) (0 C) (%) (kmh−1 ) (degrees) (Wm−2 ) Jan 39.0 11.0 0.0 12.0 5.9 91.5 12 213.5 30.9 Feb 41.0 10.0 0.0 11.0 5.6 88.4 17 215.7 67.3 Mar 19.0 6.0 0.0 17.0 6.8 87.3 9 191.6 120.2 Apr 21.0 6.0 0.0 16.0 8.8 87.2 8 196.4 166.5 May 22.0 8.0 4.0 21.0 11.0 86.2 8 211.3 193.8 Jun 36.0 7.0 7.0 24.0 14.4 81.3 6 192.0 239.3 Jul 7.0 3.0 8.0 26.0 16.3 83.8 7 235.3 227.5 Aug 30.0 13.0 6.0 22.0 13.8 85.9 8 235.0 178.7 Sep 0.0 0.0 5.0 22.0 14.2 88.0 4 158.4 139.8 Oct 22.0 8.0 5.0 20.0 12.1 89.5 9 205.7 79.5 Nov 29.0 10.0 0.0 14.0 8.2 93.9 8 178.2 43.5 Dec 4.0 3.0 ‐3.0 11.0 5.6 90.6 11 239.5 34.3 Table 2: Monthly summary statistics Page 4 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2.2 Graphical summaries and comparison with 30 year meteorological means where data are available Please be aware that statistics are based on data that may contain missing values. Full data summaries are available on request. 2.2.1 Precipitation ‐ total Numbers in red = number of missing 15 minute data observations. Figure 4: Total precipitation and comparison with 30 year mean Page 5 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2.2.2 Air temperature ‐ minimum Numbers in red = number of missing 15 minute data observations. Figure 5: Minimum air temperature and comparison with 30 year mean Page 6 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2.2.3 Air temperature ‐ maximum Numbers in red = number of missing 15 minute data observations. Figure 6: Maximum air temperature and comparison with 30 year mean Page 7 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2.2.4 Air temperature ‐ mean Vertical bars represent standard error of the mean. Numbers in red = number of missing 15 minute data observations. Figure 7: Mean relative humidity Page 8 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2.2.5 Relative humidity ‐ mean Vertical bars represent standard error of the mean. Numbers in red = number of missing 15 minute data observations. Figure 8: Mean relative humidity Page 9 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2.2.6 Solar radiation ‐ maximum Numbers in red = number of missing 15 minute data observations. Figure 9: Maximum solar radiation Page 10 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2.2.7 Windspeed ‐ mean Vertical bars represent standard error of the mean. Numbers in red = number of missing 15 minute data observations. Figure 10: Mean windspeed and comparison with 30 year mean Page 11 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2.2.8 Windrose ‐ wind speed and direction Figure 11: Windrose plots for wind speed and wind direction Page 12 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2.3 Calculated monthly variables 2.3.1 Number of days rainfall Calculated value: number of days where daily sum of rainfall > 0 mm. Numbers in red = number of missing 15 minute data observations. Figure 12: Number of days with rainfall and comparison with 30 year mean. Page 13 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 2 MONTHLY SUMMARY STATISTICS 2.3.2 Days of air frost Calculated value: number of days where minimum air temperature < 00 C. Numbers in red = number of missing 15 minute data observations. Figure 13: Number of days with air frost and comparison with 30 year mean Page 14 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 3 ANNUAL SUMMARY STATISTICS 3 ANNUAL SUMMARY STATISTICS Please be aware that statistics are based on data that may contain missing values. Full data summaries are available on request. 3.1 Table of statistics Variable Precipitation Air temperature Relative humidity Wind speed Wind direction Solar radiation Statistic (mm) (0 C) (%) (kmh−1 ) (degrees) (Wm−2 ) Total 270.0 NA NA NA NA NA Minimum 0.0 ‐3.0 43.0 0.0 0.0 0.0 Maximum 5.0 26.0 99.0 43.0 359.0 1192.0 Mean 0.0 10.2 87.8 8.6 205.8 127.1 Standard deviation 0.1 4.8 10.5 6.0 81.2 210.0 Median 0.0 10.0 91.0 7.0 223.0 5.0 Inter‐quartile range 0.0 7.0 13.0 8.0 125.0 177.0 Coefficient of variation 14.2 0.5 0.1 0.7 0.4 1.7 Missing values 1002 18 18 1459 1459 18 Missing values as a % 3 0 0 4 4 0 Table 3: Summary statistics Page 15 of 16


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    01 January 2014 00:15:00 to 01 January 2015 00:00:00 4 APPENDIX 4 APPENDIX 4.1 30 year meteorological means (1981‐2010) https://www.metoffice.gov.uk/public/weather/climate/gcj0z3b55 [North Wyke (Devon)] Month Max Temp Min Temp Air Frost Days Sunshine Hours Rainfall Rainfall Days Mean Windspeed (0 C) (0 C) (days) (hours) (mm) (days) (Wm−2 ) January 7.7 2.5 7.4 53.3 121.0 15.9 8.5 February 7.7 2.1 8.1 71.5 89.3 12.5 10.4 March 9.8 3.6 3.7 102.6 85.6 13.7 8.0 April 12.1 4.4 2.2 161.6 66.7 11.3 7.0 May 15.2 7.2 0.1 185.8 70.0 10.7 6.7 June 18.0 9.8 0.0 189.7 55.9 9.0 6.4 July 19.9 12.0 0.0 185.8 58.8 10.2 6.3 August 19.8 12.1 0.0 165.7 64.4 10.3 6.3 September 17.5 10.2 0.0 140.1 74.2 10.7 6.4 October 13.9 7.9 0.4 97.7 118.8 15.7 7.1 November 10.5 5.1 2.8 66.2 118.6 16.3 7.3 December 8.1 3.0 6.7 51.0 130.0 15.5 7.4 Table 4: 30 year meteorological means ‐ Crown copyright Met Office Page 16 of 16


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