Manston, any hour sunrise to sunset, 1997–2015
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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 19 years, 3.8% of daylight visibility records missing, 3.7% of daylight precipitation records missing, 1.5% 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 4 5 7 9 11 13 13 12 10 7 5 4  101  28%  283  6%
≤ 10 mph 13 14 18 21 23 24 25 26 22 17 15 14  231  63%  1302  27%
≤ 15 mph 22 22 26 27 28 27 30 30 28 25 23 23  312  85%  2572  53%
≤ 20 mph 26 25 28 29 29 28 30 30 29 28 26 27  334  92%  3091  64%
≤ 30 mph 28 27 29 29 29 28 30 30 29 29 28 28  344  94%  3337  69%
≤ 40 mph 28 27 29 29 29 28 30 30 29 29 28 28  345  94%  3373  69%
any wind 28 27 29 29 29 28 30 30 29 29 28 28  345  95%  3387  70%
‘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 −0.1 −0.1   −0.1 −0.1 −0.1 −0.5 −0.5   −0.1 −0.3 −0.1  −0.2
≤ 10 mph −0.1 −0.1 −0.1 +0.1 −0.1 −0.4 −0.1 −0.2 +0.1 −0.3 −0.4 −0.1  −0.1
≤ 15 mph +0.1     +0.1 −0.1 −0.2     +0.1 −0.1 −0.2     
≤ 20 mph +0.1   +0.1 +0.1 −0.1 −0.2       −0.2 −0.2 −0.1   
≤ 30 mph   −0.1       −0.2     +0.1 −0.3 −0.2    −0.1
≤ 40 mph   −0.1       −0.2     +0.1 −0.3 −0.2    −0.1
any wind   −0.1       −0.2     +0.1 −0.3 −0.2    −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 29 27 30 29 29 28 31 31 30 30 29 29  351  96%

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 30 28 31 30 31 30 31 31 30 31 29 30  360  99%

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 4 5 7 9 11 13 13 12 10 7 5 4  101  28%
≤ 10 mph 13 14 18 21 23 24 25 26 22 17 15 14  231  63%
≤ 15 mph 22 22 26 27 28 27 30 30 28 25 23 23  312  85%
≤ 20 mph 26 25 28 29 29 28 30 30 29 28 26 27  334  92%
≤ 30 mph 28 27 29 29 29 28 30 30 29 29 28 28  344  94%
≤ 40 mph 28 27 29 29 29 28 30 30 29 29 28 28  345  94%

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.