Coleshill, sunrise to sunset, 1997–2017
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Met Office station 19187: Coleshill, Warwickshire  (B46 3); OS grid reference: SP 210869.
Coordinates:  N52°28'48" W1°41'20"  (52.480 -1.689), elevation 96 m.
Note: gusts not recorded in 13 out of the 21 years, 5.4% of daylight visibility records missing, 5.5% of daylight precipitation records missing, 5.3% 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 0 0 0 0 0 0 0 0 0 0 0 0  3  1%
≤ 10 mph 2 1 2 2 2 4 4 3 3 3 2 3  33  9%
≤ 15 mph 6 5 6 6 6 9 9 7 7 6 6 6  80  22%
≤ 20 mph 7 6 8 6 7 9 9 8 8 7 8 8  91  25%
≤ 30 mph 8 7 8 7 8 10 10 9 9 8 8 8  99  27%
≤ 40 mph 8 7 8 7 8 10 10 9 9 8 8 9  100  27%
any wind 8 7 8 7 8 10 10 9 9 8 8 9  100  27%
‘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                          
≤ 10 mph +0.1 +0.1 +0.1 +0.1 +0.1           −0.1 −0.1 +0.5
≤ 15 mph +0.1   +0.2 +0.3 +0.2 +0.1       −0.1 −0.1 −0.1 +0.6
≤ 20 mph     +0.1 +0.3 +0.2         −0.1 −0.2 −0.2 +0.2
≤ 30 mph     +0.1 +0.4 +0.3 +0.1 +0.1 +0.1 +0.1   −0.1 −0.1 +0.9
≤ 40 mph     +0.2 +0.4 +0.3 +0.1 +0.1 +0.1 +0.1   −0.1   +1.1
any wind     +0.2 +0.4 +0.3 +0.1 +0.1 +0.1 +0.1   −0.1   +1.1
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 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 18 16 16 16 17 17 18 19 16 17 17 19  207  57%

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 12 11 14 12 13 14 14 13 14 13 12 12  154  42%

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 3 3 2 2 2 2 2 2 2 2 2 2  28  8%
≤ 10 mph 10 9 9 8 9 11 10 11 12 11 11 12  122  33%
≤ 15 mph 21 19 21 21 23 24 25 25 24 23 22 21  268  73%
≤ 20 mph 25 23 26 26 27 27 28 28 27 26 26 26  314  86%
≤ 30 mph 29 26 30 29 30 29 31 31 29 30 29 29  352  96%
≤ 40 mph 31 28 31 30 31 30 31 31 30 31 30 31  363  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.