Manston, sunrise to sunset, 1997–2017
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Met Office station 775: Manston, Kent  (CT12 5); OS grid reference: TR 323661.
Coordinates:  N51°20'46" E1°20'24"  (51.346 +1.340), elevation 49 m.
Note: gusts not recorded in 4 out of the 21 years, 3.8% of daylight visibility records missing, 3.6% of daylight precipitation records missing, 1.4% 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  0  0%
≤ 10 mph 1 1 1 1 1 1 1 1 1 2 2 2  15  4%
≤ 15 mph 6 5 6 6 6 8 7 7 7 6 7 7  79  22%
≤ 20 mph 8 8 9 9 10 11 11 11 11 10 10 11  120  33%
≤ 30 mph 11 10 11 11 12 12 12 12 13 12 11 13  140  38%
≤ 40 mph 11 11 12 11 12 12 12 12 13 12 12 14  146  40%
any wind 11 11 12 11 12 12 12 12 13 13 12 15  148  40%
‘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   −0.5
≤ 15 mph   −0.1 −0.2 +0.1 +0.1 −0.1   −0.1 +0.1   −0.2   −0.4
≤ 20 mph −0.1     +0.2 +0.2   +0.1   +0.3   −0.3 +0.1 +0.6
≤ 30 mph   −0.1 +0.1 +0.2 +0.2 +0.1 +0.1 +0.1 +0.3   −0.2 +0.1 +0.8
≤ 40 mph   −0.1 +0.2 +0.2 +0.2 +0.2 +0.2 +0.1 +0.4 −0.1 −0.2 +0.2 +1.2
any wind   −0.1 +0.2 +0.2 +0.2 +0.2 +0.2 +0.1 +0.4 −0.1 −0.1 +0.2 +1.3
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 20 19 18 18 20 19 21 21 19 20 20 22  237  65%

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 15 14 17 16 17 17 16 17 18 17 16 18  199  54%

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 0 0 0 0 0 0 0 0 0 0 0 1  3  1%
≤ 10 mph 4 3 3 3 2 2 2 2 4 3 5 4  38  10%
≤ 15 mph 14 12 14 14 15 16 16 17 16 14 15 15  178  49%
≤ 20 mph 21 19 22 22 23 24 25 25 24 22 21 22  270  74%
≤ 30 mph 27 25 28 28 28 28 30 29 28 28 27 27  332  91%
≤ 40 mph 29 27 29 30 30 30 31 31 30 31 29 29  354  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.