Summary of ‘flyable’ days, 1997–2020
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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
📌 Kirkwall, Orkney 10 10 9 7 5 3 3
📌 Prestwick RNAS, Ayrs 43 44 30 18 15 6 7
📌 Aldergrove, Antrim 33 34 30 23 22 15 8
📌 Wittering, Cambs 18 17 16 15 13 9 6
📌 Coleshill, Warks 45 39 30 23 23 17 12
📌 Brize Norton, Oxon 52 50 32 25 24 17 10
📌 Pembrey Sands, Dyfed 32 36 21 11 10 7 6
📌 Manston, Kent 14 15 8 6 8 5 3
📌 Odiham, Hants 33 27 21 16 13 8 4
📌 Yeovilton, Som. 53 48 36 26 21 7 4
📌 Culdrose, Cornw. 14 18 11 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
📌 Kirkwall, Orkney 37 40 41 37 32 25 21
📌 Prestwick RNAS, Ayrs 87 107 100 82 76 50 38
📌 Aldergrove, Antrim 82 101 99 91 90 67 45
📌 Wittering, Cambs 70 80 72 68 68 45 27
📌 Coleshill, Warks 102 138 128 116 116 83 48
📌 Brize Norton, Oxon 102 138 125 115 116 84 50
📌 Pembrey Sands, Dyfed 76 99 76 55 54 40 25
📌 Manston, Kent 76 86 71 62 66 46 26
📌 Odiham, Hants 83 95 83 77 75 52 30
📌 Yeovilton, Som. 98 120 100 86 80 49 32
📌 Culdrose, Cornw. 54 74 60 51 50 40 27

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
📌 Kirkwall, Orkney 75 91 100 97 93 72 53
📌 Prestwick RNAS, Ayrs 118 165 171 164 164 118 76
📌 Aldergrove, Antrim 113 165 176 172 173 126 79
📌 Wittering, Cambs 123 169 162 159 160 109 62
📌 Coleshill, Warks 123 197 205 200 199 139 74
📌 Brize Norton, Oxon 121 196 204 203 207 147 75
📌 Pembrey Sands, Dyfed 113 166 157 145 143 103 57
📌 Manston, Kent 133 185 177 172 174 117 58
📌 Odiham, Hants 118 173 173 173 176 126 67
📌 Yeovilton, Som. 122 186 185 180 180 129 72
📌 Culdrose, Cornw. 83 131 125 126 128 104 59

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
📌 Kirkwall, Orkney 93 122 141 138 133 102 69
📌 Prestwick RNAS, Ayrs 126 183 202 201 201 141 86
📌 Aldergrove, Antrim 118 178 198 197 197 141 85
📌 Wittering, Cambs 137 206 212 210 211 142 75
📌 Coleshill, Warks 125 206 218 218 218 148 75
📌 Brize Norton, Oxon 123 204 220 221 225 157 78
📌 Pembrey Sands, Dyfed 131 198 200 197 200 146 79
📌 Manston, Kent 151 228 228 226 228 149 68
📌 Odiham, Hants 125 196 209 216 219 154 77
📌 Yeovilton, Som. 126 203 217 222 224 162 85
📌 Culdrose, Cornw. 91 151 153 156 161 128 69

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
📌 Kirkwall, Orkney 103 146 175 178 168 124 77
📌 Prestwick RNAS, Ayrs 129 194 219 220 218 150 88
📌 Aldergrove, Antrim 119 183 207 207 207 147 86
📌 Wittering, Cambs 140 222 236 240 238 158 78
📌 Coleshill, Warks 126 212 228 230 229 154 78
📌 Brize Norton, Oxon 125 210 232 238 241 168 81
📌 Pembrey Sands, Dyfed 151 238 245 254 260 190 98
📌 Manston, Kent 156 247 254 257 257 163 72
📌 Odiham, Hants 127 204 224 234 238 164 79
📌 Yeovilton, Som. 127 210 230 241 245 175 87
📌 Culdrose, Cornw. 97 171 178 187 194 148 77

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
📌 Kirkwall, Orkney 104 149 180 183 173 127 78
📌 Prestwick RNAS, Ayrs 129 196 222 223 222 152 89
📌 Aldergrove, Antrim 120 185 210 211 210 149 87
📌 Wittering, Cambs 141 226 242 248 245 160 79
📌 Coleshill, Warks 126 213 230 232 233 156 78
📌 Brize Norton, Oxon 125 212 235 242 246 170 81
📌 Pembrey Sands, Dyfed 154 246 256 267 275 199 101
📌 Manston, Kent 156 250 258 263 262 167 72
📌 Odiham, Hants 127 206 227 240 243 167 79
📌 Yeovilton, Som. 127 212 234 246 249 177 88
📌 Culdrose, Cornw. 100 182 193 205 212 157 79

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

All text Copyright © Mike Cowlishaw 2008, 2021. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2021-05-09.