Summary of ‘flyable’ days, 1997–2015
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This is a summary of the average number of flyable days per year at various maximum wind speeds, for the stations so far analysed.

Each table is an analysis for a given maximum wind speed. The stations are listed from north to south, and for each two-hour timeslot the average number of flyable days per year is shown. See the home page for details of the criteria for ‘adequate visibility’ and ‘bad weather’.

Click on any of the day counts to see the detailed analysis for that station and timeslot.
Click on the Δ beside a station name to see its location in Google Maps.

Wind speed up to 5 mph

This table shows the average number of flyable days per year for each station and timeslot. Flyable days are those with adequate visibility, no bad weather, and wind speed no more than 5 mph.
  06:00–08:00 08:00–10:00 10:00–12:00 12:00–14:00 14:00–16:00 16:00–18:00 18:00–20:00
Δ Kirkwall, Orkney 10 10 9 6 5 3 3
Δ Prestwick RNAS, Ayrs 44 44 31 18 15 6 7
Δ Aldergrove, Antrim 32 34 29 24 22 16 8
Δ Linton On Ouse, NYork. 47 49 40 31 27 15 8
Δ Wittering, Cambs 18 17 16 16 14 8 6
Δ Coleshill, Warks 42 38 29 23 23 16 12
Δ Brize Norton, Oxon 51 49 31 24 23 16 10
Δ Pembrey Sands, Dyfed 31 36 22 11 10 7 6
Δ Manston, Kent 15 16 8 5 8 5 3
Δ Odiham, Hants 31 26 20 15 13 7 4
Δ Yeovilton, Som. 52 49 37 27 21 7 4
Δ Culdrose, Cornw. 14 18 12 6 5 4 3

Wind speed up to 10 mph

This table shows the average number of flyable days per year for each station and timeslot. Flyable days are those with adequate visibility, no bad weather, and wind speed no more than 10 mph.
  06:00–08:00 08:00–10:00 10:00–12:00 12:00–14:00 14:00–16:00 16:00–18:00 18:00–20:00
Δ Kirkwall, Orkney 35 38 40 36 31 24 20
Δ Prestwick RNAS, Ayrs 85 107 101 81 77 51 38
Δ Aldergrove, Antrim 79 98 96 89 89 66 44
Δ Linton On Ouse, NYork. 105 127 108 94 94 62 46
Δ Wittering, Cambs 68 78 70 68 67 45 27
Δ Coleshill, Warks 97 133 122 111 111 80 47
Δ Brize Norton, Oxon 101 134 122 111 114 83 49
Δ Pembrey Sands, Dyfed 76 99 77 56 55 41 25
Δ Manston, Kent 74 84 70 61 66 46 26
Δ Odiham, Hants 80 90 80 74 73 50 30
Δ Yeovilton, Som. 95 117 99 85 79 50 33
Δ Culdrose, Cornw. 53 75 61 52 52 42 28

Wind speed up to 15 mph

This table shows the average number of flyable days per year for each station and timeslot. Flyable days are those with adequate visibility, no bad weather, and wind speed no more than 15 mph.
  06:00–08:00 08:00–10:00 10:00–12:00 12:00–14:00 14:00–16:00 16:00–18:00 18:00–20:00
Δ Kirkwall, Orkney 72 88 96 93 90 70 51
Δ Prestwick RNAS, Ayrs 115 163 171 164 164 118 76
Δ Aldergrove, Antrim 110 160 170 167 168 124 77
Δ Linton On Ouse, NYork. 136 198 193 190 192 139 90
Δ Wittering, Cambs 119 166 159 157 156 108 62
Δ Coleshill, Warks 118 193 202 197 197 138 73
Δ Brize Norton, Oxon 119 195 203 202 207 146 74
Δ Pembrey Sands, Dyfed 112 163 155 145 142 103 57
Δ Manston, Kent 131 182 174 170 172 117 56
Δ Odiham, Hants 114 169 170 170 175 123 66
Δ Yeovilton, Som. 119 181 182 179 179 128 70
Δ Culdrose, Cornw. 82 130 125 127 127 103 58

Wind speed up to 20 mph

This table shows the average number of flyable days per year for each station and timeslot. Flyable days are those with adequate visibility, no bad weather, and wind speed no more than 20 mph.
  06:00–08:00 08:00–10:00 10:00–12:00 12:00–14:00 14:00–16:00 16:00–18:00 18:00–20:00
Δ Kirkwall, Orkney 89 117 137 134 128 99 67
Δ Prestwick RNAS, Ayrs 123 182 202 201 201 142 86
Δ Aldergrove, Antrim 114 173 193 193 193 139 84
Δ Linton On Ouse, NYork. 141 219 226 230 231 164 98
Δ Wittering, Cambs 132 202 207 206 208 141 74
Δ Coleshill, Warks 120 203 217 218 218 148 76
Δ Brize Norton, Oxon 121 202 219 221 225 157 77
Δ Pembrey Sands, Dyfed 130 195 197 194 199 146 79
Δ Manston, Kent 148 224 223 222 224 147 66
Δ Odiham, Hants 121 192 205 213 216 152 76
Δ Yeovilton, Som. 123 198 215 221 222 160 84
Δ Culdrose, Cornw. 89 148 151 155 158 126 67

Wind speed up to 30 mph

This table shows the average number of flyable days per year for each station and timeslot. Flyable days are those with adequate visibility, no bad weather, and wind speed no more than 30 mph.
  06:00–08:00 08:00–10:00 10:00–12:00 12:00–14:00 14:00–16:00 16:00–18:00 18:00–20:00
Δ Kirkwall, Orkney 99 141 170 173 163 121 75
Δ Prestwick RNAS, Ayrs 125 192 219 221 220 151 89
Δ Aldergrove, Antrim 115 178 202 203 203 145 85
Δ Linton On Ouse, NYork. 143 228 240 248 251 174 100
Δ Wittering, Cambs 135 219 231 237 235 156 77
Δ Coleshill, Warks 121 208 225 227 227 153 77
Δ Brize Norton, Oxon 122 209 230 237 240 167 80
Δ Pembrey Sands, Dyfed 151 234 241 250 258 190 99
Δ Manston, Kent 153 243 248 252 252 161 70
Δ Odiham, Hants 123 200 220 231 236 162 78
Δ Yeovilton, Som. 124 205 227 240 244 174 87
Δ Culdrose, Cornw. 93 167 175 185 190 144 74

Wind speed up to 40 mph

This table shows the average number of flyable days per year for each station and timeslot. Flyable days are those with adequate visibility, no bad weather, and wind speed no more than 40 mph.
  06:00–08:00 08:00–10:00 10:00–12:00 12:00–14:00 14:00–16:00 16:00–18:00 18:00–20:00
Δ Kirkwall, Orkney 100 144 175 178 167 123 75
Δ Prestwick RNAS, Ayrs 126 193 221 223 222 153 89
Δ Aldergrove, Antrim 116 179 204 205 205 147 85
Δ Linton On Ouse, NYork. 144 231 246 256 258 177 101
Δ Wittering, Cambs 136 222 237 244 241 158 78
Δ Coleshill, Warks 121 209 227 230 230 154 77
Δ Brize Norton, Oxon 123 210 233 241 244 169 80
Δ Pembrey Sands, Dyfed 153 241 250 263 271 199 101
Δ Manston, Kent 153 245 252 258 257 164 71
Δ Odiham, Hants 123 202 224 236 241 164 78
Δ Yeovilton, Som. 124 207 230 245 248 175 87
Δ Culdrose, Cornw. 96 177 190 202 208 153 76

Please send any comments, questions, or corrections to me, Mike Cowlishaw, at mfc@speleotrove.com.

All text Copyright © Mike Cowlishaw 2008, 2017. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2017-01-01.