Prestwick RNAS, 10:00 to 12:00, 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, 0.9% of daylight visibility records missing, 0.7% of daylight wind records missing.

This is the analysis for the average of 24 years  (1997–2020).
Time slot: 10:00 to 12:00  (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 4 4 3 1 1 1 1 2 2 3 4 4 ​ 30  8%
≤ 10 mph 8 7 7 8 8 9 8 8 8 9 10 10 ​ 100  27%
≤ 15 mph 12 12 13 15 16 16 17 15 14 14 14 13 ​ 171  47%
≤ 20 mph 14 14 16 18 20 20 19 18 17 16 16 15 ​ 202  55%
≤ 30 mph 15 15 18 20 21 21 20 19 19 18 17 16 ​ 219  60%
≤ 40 mph 16 16 18 20 21 21 20 20 19 18 17 16 ​ 222  61%
any wind 16 16 18 20 21 21 20 20 19 18 17 17 ​ 223  61%
‘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 −0.1 −0.1 −0.1 +0.1 +0.1 −0.1  
≤ 10 mph −0.1 +0.2 +0.1 +0.1 +0.1 +0.2 −0.1 −0.2 +0.1 +0.2 +0.2 −0.2 ​+0.5
≤ 15 mph −0.1 +0.2 +0.1 +0.1 +0.1 +0.3 −0.1 −0.2 +0.1 +0.2 +0.1 −0.2 ​+0.5
≤ 20 mph −0.1 +0.1 +0.1     +0.1 −0.1 −0.1   +0.2   −0.2 ​+0.1
≤ 30 mph −0.1     +0.1 +0.1 +0.1 −0.1 −0.1   +0.1   −0.2 ​+0.1
≤ 40 mph −0.1 +0.1   +0.1 +0.1 +0.1 −0.1 −0.1   +0.1   −0.1 ​+0.2
any wind   +0.1   +0.1 +0.1 +0.1 −0.1 −0.1   +0.2   −0.1 ​+0.4
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 28 25 28 28 30 28 28 28 27 28 28 28 ​ 334  91%

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 20 21 21 21 21 20 20 19 18 17 ​ 231  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 4 4 2 2 2 2 3 3 4 6 6 ​ 43  12%
≤ 10 mph 13 10 10 10 10 12 12 12 11 12 13 14 ​ 137  38%
≤ 15 mph 19 17 19 21 22 23 25 23 20 20 21 20 ​ 251  69%
≤ 20 mph 24 21 25 26 28 28 29 28 26 26 25 24 ​ 308  84%
≤ 30 mph 28 26 29 30 30 30 31 31 29 30 28 28 ​ 350  96%
≤ 40 mph 30 27 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.