Prestwick RNAS, 08:00 to 10:00, 1997–2020
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Met Office station 1007: Prestwick RNAS, Ayrshire  (KA9 2); OS grid reference: NS 369276.
Coordinates:  N55°30'54" W4°35'06"  (55.515 -4.585), elevation 27 m.
Note: gusts not recorded in 13 out of the 24 years, 0.7% of daylight visibility records missing, 0.6% of daylight wind records missing.

This is the analysis for the average of 24 years  (1997–2020).
Time slot: 08:00 to 10:00  (two hours); click below for any-hour analysis, or a different start time, or for whole day analysis (all times are GMT):

any-hour  06:00  08:00  10:00  12:00  14:00  16:00  18:00  all-day

‘Flyable days’ analysis

This is the number of days in each month, on average, for which (in this timeslot) the visibility was adequate, and there was no bad weather, and the wind speed was less than or equal to that shown on the left.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
≤ 5 mph 2 4 5 4 4 3 4 5 5 5 4 1 ​ 44  12%
≤ 10 mph 4 8 9 10 10 11 11 11 10 10 10 2 ​ 107  29%
≤ 15 mph 5 11 14 17 18 17 17 17 15 14 14 3 ​ 165  45%
≤ 20 mph 6 13 16 19 20 19 19 19 17 16 15 4 ​ 183  50%
≤ 30 mph 7 14 18 20 21 20 20 20 18 17 16 4 ​ 194  53%
≤ 40 mph 7 15 18 20 21 20 20 20 18 17 16 4 ​ 196  54%
any wind 7 15 18 20 21 20 20 20 18 17 16 4 ​ 196  54%
‘Total’ shows the total flyable days, on average, in a year, and the same as a percentage.

Trend analysis

This is the average change (per year, over the 24 years) in the average number of days in each month for which (in this timeslot) the visibility was adequate, and there was no bad weather, and the wind speed was less than or equal to that shown on the left.

For example, if a value of +0.5 is shown for a given month then that implies that since 1997 the number of flyable days in that month has increased by (on average) half a day per year.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
≤ 5 mph −0.1   +0.1 +0.1     −0.1 −0.2 +0.1 +0.1      
≤ 10 mph −0.1 +0.1 +0.1 +0.1 +0.1 +0.3   −0.2 +0.1 +0.1 +0.2   ​+0.7
≤ 15 mph −0.1 +0.2 +0.2 +0.3 +0.2 +0.2 +0.1 −0.1 +0.1   +0.1 −0.1 ​+1.0
≤ 20 mph −0.1 +0.1 +0.1 +0.1 +0.1 +0.1   −0.1     +0.1   ​+0.5
≤ 30 mph −0.1   +0.2 +0.1 +0.1 +0.1 +0.1   +0.1       ​+0.5
≤ 40 mph −0.1   +0.2 +0.2 +0.1 +0.1 +0.1   +0.1       ​+0.7
any wind −0.1 +0.1 +0.2 +0.2 +0.2 +0.1 +0.1   +0.1       ​+0.8
Empty cells indicate negligible change; ‘Total’ shows the sum of the trends over the whole year.

Visibility analysis

This is the number of days in each month, on average, for which (in this timeslot) the visibility was adequate. That is, for the entire timeslot:
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 12 25 27 28 30 28 28 28 27 28 27 7 ​ 293  80%

Bad weather analysis

This is the number of days in each month, on average, for which (in this timeslot) no bad weather occurred. That is, for the entire timeslot, there was no rain, hail, snow, snow on the ground, icing conditions, thunderstorms, etc.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 17 16 19 21 22 20 21 21 19 18 17 17 ​ 228  63%

Wind speed analysis

This is the number of days in each month, on average, for which (in this timeslot) the maximum (gust) wind speed was less than or equal to the value shown on the left.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
≤ 5 mph 6 6 6 5 5 4 5 6 6 7 6 6 ​ 68  19%
≤ 10 mph 14 12 13 13 13 15 15 15 14 15 14 14 ​ 168  46%
≤ 15 mph 20 18 22 24 24 25 26 25 23 23 21 21 ​ 273  75%
≤ 20 mph 24 22 26 27 28 28 30 29 27 27 25 24 ​ 317  87%
≤ 30 mph 29 26 30 29 30 30 31 31 29 30 29 28 ​ 353  97%
≤ 40 mph 30 28 31 30 31 30 31 31 30 31 29 30 ​ 361  99%
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.