Manston, 14:00 to 16:00, 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, 3.9% of daylight visibility records missing, 3.1% of daylight precipitation records missing, 1.3% of daylight wind records missing.

This is the analysis for the average of 21 years  (1997–2017).
Time slot: 14:00 to 16:00  (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 1 1 1 0 1 0 1 0 1 1 1 1  8  2%
≤ 10 mph 4 5 5 6 6 6 6 6 5 5 6 5  65  18%
≤ 15 mph 12 12 14 15 15 16 16 17 16 13 13 13  173  47%
≤ 20 mph 16 16 19 20 20 20 21 21 20 18 17 18  227  62%
≤ 30 mph 19 19 21 22 22 22 23 23 23 21 19 20  255  70%
≤ 40 mph 19 20 22 23 23 22 23 24 23 22 20 21  260  71%
any wind 19 20 22 23 23 23 24 24 23 22 20 21  263  72%
‘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 −0.2
≤ 10 mph −0.1 −0.1   +0.1   −0.2 −0.1 −0.3   −0.1 −0.2   −1.0
≤ 15 mph −0.1 −0.1 −0.1 +0.2 −0.1 −0.3 −0.2 −0.4   −0.2 −0.3   −1.4
≤ 20 mph   −0.1   +0.2 +0.1   +0.1 −0.2 +0.2   −0.3 +0.1  
≤ 30 mph   −0.2 +0.1 +0.1 +0.1   +0.2 −0.1 +0.2 −0.1 −0.2 +0.1 +0.1
≤ 40 mph   −0.3 +0.2 +0.1 +0.1   +0.2 −0.1 +0.2 −0.1 −0.2 +0.2 +0.4
any wind   −0.2 +0.2 +0.1 +0.2   +0.2 −0.1 +0.2   −0.2 +0.2 +0.6
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 26 25 27 27 28 26 28 29 27 27 27 26  322  88%

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 22 22 25 24 25 25 26 25 25 24 22 23  289  79%

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 2 1 1 1 1 1 1 1 1 1 1 2  14  4%
≤ 10 mph 7 6 7 7 8 8 8 8 7 7 8 8  89  24%
≤ 15 mph 18 16 19 19 20 21 20 22 20 19 19 19  231  63%
≤ 20 mph 24 22 25 25 26 27 27 27 26 25 25 25  305  84%
≤ 30 mph 29 26 29 29 30 29 30 30 29 30 28 29  350  96%
≤ 40 mph 30 28 30 30 30 30 31 31 30 31 29 30  360  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.