Prestwick RNAS, sunrise to sunset, 1997–2017
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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 21 years, 0.6% of daylight visibility records missing, 0.6% of daylight wind records missing.

This is the analysis for the average of 21 years  (1997–2017).
Time slot: sunrise to sunset  (all daylight hours); click below on any-hour, or on the start time for a specific 2-hour slot (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 all daylight hours) 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 1 1 0 0 0 0 0 0 0 0 1 1  4  1%
≤ 10 mph 5 3 3 2 1 1 2 2 3 3 5 5  33  9%
≤ 15 mph 7 6 6 6 7 7 7 7 7 6 8 7  82  22%
≤ 20 mph 8 6 7 9 9 9 8 8 9 8 9 8  99  27%
≤ 30 mph 9 7 8 9 10 10 9 9 10 9 10 9  108  30%
≤ 40 mph 9 7 8 10 10 10 9 9 10 9 10 9  110  30%
any wind 9 7 9 10 10 10 9 9 10 9 10 9  110  30%
‘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 21 years) in the average number of days in each month for which (in all daylight hours) 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
≤ 10 mph −0.1 +0.2 +0.1 +0.1   +0.1 −0.1     +0.1 +0.2 −0.1 +0.5
≤ 15 mph   +0.1 +0.1 +0.1 +0.1 +0.3     +0.2 +0.1 +0.1 −0.1 +0.9
≤ 20 mph   +0.1   +0.1   +0.1   −0.1 +0.2   +0.1 −0.1 +0.4
≤ 30 mph −0.1     +0.1   +0.1   −0.1 +0.2     −0.1 +0.1
≤ 40 mph −0.1 +0.1   +0.1   +0.1   −0.1 +0.2   +0.1 −0.1 +0.3
any wind   +0.1   +0.1   +0.1   −0.1 +0.2   +0.1 −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 all daylight hours) the visibility was adequate. That is, for the entire day:
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 24 21 21 23 24 22 21 21 22 22 23 24  269  74%

Bad weather analysis

This is the number of days in each month, on average, for which (in all daylight hours) no bad weather occurred. That is, for the entire day, 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 11 8 10 11 12 11 10 10 11 10 10 10  123  34%

Wind speed analysis

This is the number of days in each month, on average, for which (in all daylight hours) 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 2 1 0 0 0 0 0 0 0 1 1 3  9  2%
≤ 10 mph 8 5 5 4 2 3 4 4 5 6 8 9  65  18%
≤ 15 mph 15 13 14 15 14 17 18 17 15 15 16 16  186  51%
≤ 20 mph 20 17 20 22 23 24 26 26 22 21 22 21  263  72%
≤ 30 mph 26 24 28 28 29 29 31 30 28 28 27 26  335  92%
≤ 40 mph 29 27 30 30 31 30 31 31 29 30 29 29  356  97%

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 2018-02-09.