Prestwick RNAS, 06:00 to 08:00, 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, 0.5% 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: 06:00 to 08:00  (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 0 3 6 6 7 7 8 6 1 0 0  44  12%
≤ 10 mph 0 0 5 12 13 13 13 14 13 2 0 0  86  23%
≤ 15 mph 0 0 7 17 19 18 18 18 16 3 0 0  116  32%
≤ 20 mph 0 0 8 18 20 19 19 19 18 3 0 0  124  34%
≤ 30 mph 0 0 9 18 21 19 19 19 18 3 0 0  127  35%
≤ 40 mph 0 0 9 18 21 19 19 19 18 3 0 0  127  35%
any wind 0 0 9 18 21 19 19 19 19 3 0 0  127  35%
‘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 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       +0.2
≤ 10 mph     +0.1 +0.2 +0.2 +0.2 +0.1 −0.1 +0.2       +0.9
≤ 15 mph       +0.2 +0.2 +0.1 +0.2 +0.1 +0.2       +1.0
≤ 20 mph     +0.1 +0.1 +0.2 +0.1 +0.2   +0.2       +0.9
≤ 30 mph     +0.1 +0.1 +0.2 +0.1 +0.2 +0.1 +0.2       +1.0
≤ 40 mph     +0.1 +0.1 +0.2 +0.1 +0.2 +0.1 +0.2       +1.0
any wind     +0.1 +0.1 +0.2 +0.1 +0.2 +0.1 +0.3       +1.0
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 0 14 26 28 28 27 27 26 5 0 0  182  50%

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 16 16 19 20 22 20 20 20 20 18 17 17  225  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 6 6 7 8 8 9 10 10 9 6 6 6  90  25%
≤ 10 mph 14 13 15 18 17 18 19 20 17 16 14 14  195  53%
≤ 15 mph 20 19 23 25 26 27 27 27 24 23 21 21  283  77%
≤ 20 mph 24 23 26 28 29 29 30 30 28 27 25 24  322  88%
≤ 30 mph 28 27 30 30 31 30 31 31 29 30 28 28  353  97%
≤ 40 mph 30 28 31 30 31 30 31 31 30 31 30 30  361  99%

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.