Summary of ‘flyable’ days, 1997–2017
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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 15 8
Δ Linton On Ouse, NYork. 46 48 39 30 27 14 8
Δ Wittering, Cambs 18 17 16 15 14 8 6
Δ Coleshill, Warks 42 38 29 23 22 16 12
Δ Brize Norton, Oxon 51 49 32 24 24 17 10
Δ Pembrey Sands, Dyfed 31 36 22 11 10 7 6
Δ Manston, Kent 15 15 8 5 8 5 3
Δ Odiham, Hants 31 26 21 16 13 8 4
Δ Yeovilton, Som. 52 48 37 26 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 36 39 40 36 31 24 20
Δ Prestwick RNAS, Ayrs 86 107 101 82 76 50 38
Δ Aldergrove, Antrim 80 99 97 89 89 66 44
Δ Linton On Ouse, NYork. 105 126 107 93 93 61 45
Δ Wittering, Cambs 69 79 71 68 68 45 27
Δ Coleshill, Warks 99 134 124 113 113 80 47
Δ Brize Norton, Oxon 101 136 123 112 115 83 49
Δ Pembrey Sands, Dyfed 76 99 77 55 55 40 24
Δ Manston, Kent 75 85 70 61 65 45 26
Δ Odiham, Hants 81 91 81 75 74 51 30
Δ Yeovilton, Som. 97 118 100 86 79 49 33
Δ Culdrose, Cornw. 54 75 61 52 51 41 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 73 89 97 95 91 71 52
Δ Prestwick RNAS, Ayrs 116 164 172 164 164 117 76
Δ Aldergrove, Antrim 111 163 173 169 169 124 78
Δ Linton On Ouse, NYork. 136 199 193 189 193 139 90
Δ Wittering, Cambs 120 167 160 158 159 109 62
Δ Coleshill, Warks 120 194 202 198 198 138 73
Δ Brize Norton, Oxon 119 195 204 202 207 146 74
Δ Pembrey Sands, Dyfed 111 165 156 145 142 102 56
Δ Manston, Kent 132 184 176 171 173 117 57
Δ Odiham, Hants 115 170 171 172 175 124 66
Δ Yeovilton, Som. 121 184 184 181 180 128 70
Δ Culdrose, Cornw. 83 132 125 126 127 103 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 91 120 138 135 131 101 68
Δ Prestwick RNAS, Ayrs 124 183 202 201 201 141 86
Δ Aldergrove, Antrim 115 175 195 195 194 140 84
Δ Linton On Ouse, NYork. 142 220 226 230 233 164 98
Δ Wittering, Cambs 134 204 209 208 210 141 74
Δ Coleshill, Warks 122 204 216 217 217 148 75
Δ Brize Norton, Oxon 122 203 220 221 225 156 77
Δ Pembrey Sands, Dyfed 130 197 199 196 199 146 78
Δ Manston, Kent 150 227 227 225 227 148 67
Δ Odiham, Hants 122 193 207 214 218 153 76
Δ Yeovilton, Som. 124 201 216 223 223 160 84
Δ Culdrose, Cornw. 90 150 152 155 159 127 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 101 144 172 175 166 123 75
Δ Prestwick RNAS, Ayrs 127 193 219 220 219 151 89
Δ Aldergrove, Antrim 117 180 204 204 204 145 86
Δ Linton On Ouse, NYork. 144 229 241 248 252 174 100
Δ Wittering, Cambs 137 220 233 239 237 157 77
Δ Coleshill, Warks 123 209 225 228 227 153 76
Δ Brize Norton, Oxon 123 209 231 237 240 167 80
Δ Pembrey Sands, Dyfed 151 237 244 252 259 190 98
Δ Manston, Kent 154 245 252 255 255 162 71
Δ Odiham, Hants 124 201 222 233 237 163 78
Δ Yeovilton, Som. 125 207 228 241 244 174 86
Δ Culdrose, Cornw. 95 169 176 185 192 145 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 102 146 177 179 170 125 76
Δ Prestwick RNAS, Ayrs 127 195 222 223 222 152 89
Δ Aldergrove, Antrim 117 182 206 207 206 147 86
Δ Linton On Ouse, NYork. 145 232 247 256 259 178 101
Δ Wittering, Cambs 138 224 239 246 243 159 78
Δ Coleshill, Warks 123 209 227 230 231 154 76
Δ Brize Norton, Oxon 123 210 233 241 245 169 80
Δ Pembrey Sands, Dyfed 153 244 253 265 273 199 100
Δ Manston, Kent 155 248 256 262 260 165 72
Δ Odiham, Hants 124 203 225 238 242 165 78
Δ Yeovilton, Som. 126 209 232 246 248 175 87
Δ Culdrose, Cornw. 97 179 190 202 209 155 77

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

All text Copyright © Mike Cowlishaw 2008, 2018. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2018-02-04.