Prestwick RNAS, 16:00 to 18:00, 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, 0.6% of daylight visibility records missing, 0.4% of daylight wind records missing.

This is the analysis for the average of 24 years  (1997–2020).
Time slot: 16:00 to 18:00  (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 0 1 1 1 0 1 0 1 1 1 0 0 ​ 6  2%
≤ 10 mph 0 3 7 6 6 7 6 6 7 3 0 0 ​ 50  14%
≤ 15 mph 0 5 13 15 16 16 17 16 15 5 0 0 ​ 118  32%
≤ 20 mph 0 6 16 18 20 19 19 19 17 6 0 0 ​ 141  39%
≤ 30 mph 0 6 18 20 22 20 20 20 19 7 0 0 ​ 150  41%
≤ 40 mph 0 6 18 20 22 20 20 20 19 7 0 0 ​ 152  42%
any wind 0 6 18 20 22 20 20 20 19 7 0 0 ​ 152  42%
‘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                          
≤ 10 mph     +0.1 +0.1 +0.1 +0.2 −0.1 −0.1   +0.1     ​+0.4
≤ 15 mph     +0.1 +0.1 +0.1 +0.3   −0.1   +0.1     ​+0.7
≤ 20 mph           +0.1 −0.1 −0.2          
≤ 30 mph       +0.1   +0.1 −0.1 −0.1         ​−0.1
≤ 40 mph       +0.1 +0.1 +0.1 −0.1 −0.1         ​+0.1
any wind       +0.1 +0.1 +0.1 −0.1 −0.1         ​+0.1
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 0 10 28 29 30 29 29 29 28 10 0 0 ​ 222  61%

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 17 19 21 22 21 20 21 19 18 17 17 ​ 227  62%

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 5 3 2 1 1 1 1 1 2 3 5 6 ​ 31  8%
≤ 10 mph 12 9 9 8 8 10 10 10 11 12 13 14 ​ 124  34%
≤ 15 mph 19 17 20 21 21 22 25 23 21 22 21 21 ​ 253  69%
≤ 20 mph 23 21 25 26 27 28 29 29 26 26 25 25 ​ 310  85%
≤ 30 mph 28 26 30 29 30 30 31 31 29 30 28 28 ​ 350  96%
≤ 40 mph 30 28 31 30 31 30 31 31 30 31 29 30 ​ 360  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.