Prestwick RNAS, any hour sunrise to sunset, 1997–2015
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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 19 years, 0.6% of daylight visibility records missing, 0.6% of daylight wind records missing.

This is the analysis for the average of 19 years  (1997–2015).
Time slot: sunrise to sunset  (any daylight hour); click below on the start time for a specific 2-hour slot, or on all-day 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 some daylight hour) 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 Hours
≤ 5 mph 10 10 12 15 16 17 18 17 14 11 11 11  163  45%  629  13%
≤ 10 mph 17 16 19 23 24 25 26 25 22 20 17 17  251  69%  1575  32%
≤ 15 mph 22 21 26 28 29 29 30 29 27 26 23 22  312  85%  2554  52%
≤ 20 mph 24 24 28 29 30 29 31 30 28 28 25 24  332  91%  2911  60%
≤ 30 mph 27 26 30 29 31 30 31 30 29 29 27 27  346  95%  3086  63%
≤ 40 mph 28 27 30 29 31 30 31 30 29 29 28 27  348  95%  3107  64%
any wind 28 27 30 29 31 30 31 30 29 29 28 27  349  95%  3115  64%
‘Total’ shows the total flyable days, on average, in a year, and the same as a percentage.
‘Hours’ shows the total flyable hours, on average, in a year, and the same as a percentage of total daylight hours.

Trend analysis

This is the average change (per year, over the 19 years) in the average number of days in each month for which (in some daylight hour) 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 −0.2 +0.4 +0.1 +0.1   +0.5 +0.1 −0.2 +0.1 +0.3 +0.2 −0.1  +0.1
≤ 10 mph −0.1 +0.4 +0.2 +0.2   +0.3   −0.1 +0.1 +0.3 +0.1 −0.3  +0.1
≤ 15 mph −0.1 +0.5   +0.1     +0.1     +0.1 −0.1 −0.4   
≤ 20 mph −0.1 +0.3   +0.1         −0.1 +0.1   −0.3   
≤ 30 mph −0.1 +0.2   +0.1           +0.1   −0.1   
≤ 40 mph −0.1 +0.2   +0.1           +0.1 +0.1 −0.1   
any wind   +0.2   +0.1           +0.1 +0.1     
Empty cells indicate negligible change; ‘Total’ shows the average trend over the whole year.

Visibility analysis

This is the number of days in each month, on average, for which (in some daylight hour) the visibility was adequate. That is, for the entire hour:
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 31 28 31 30 31 30 31 31 30 31 30 31  363  99%

Bad weather analysis

This is the number of days in each month, on average, for which (in some daylight hour) no bad weather occurred. That is, for the entire hour, 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 29 27 30 30 31 30 31 31 29 30 28 28  352  96%

Wind speed analysis

This is the number of days in each month, on average, for which (in some daylight hour) 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 10 10 12 15 16 17 18 17 14 11 11 11  163  45%
≤ 10 mph 17 16 19 23 24 25 26 25 22 20 17 17  251  69%
≤ 15 mph 22 21 26 28 29 29 30 29 27 26 23 22  312  85%
≤ 20 mph 24 24 28 29 30 29 31 30 28 28 25 24  332  91%
≤ 30 mph 27 26 30 29 31 30 31 30 29 29 27 27  346  95%
≤ 40 mph 28 27 30 29 31 30 31 30 29 29 28 27  348  95%

Please send any comments, questions, or corrections to me, Mike Cowlishaw, at mfc@speleotrove.com.

All text Copyright © Mike Cowlishaw 2008, 2017. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2017-01-01.