Manston, 08:00 to 10:00, 1997–2020
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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 24 years, 3.1% of daylight visibility records missing, 3.0% of daylight precipitation records missing, 1.4% of daylight wind records missing.

This is the analysis for the average of 24 years  (1997–2020).
Time slot: 08:00 to 10:00  (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 2 1 1 1 2 1 2 1 1 ​ 15  4%
≤ 10 mph 5 5 6 7 8 9 9 9 8 7 7 6 ​ 86  24%
≤ 15 mph 13 11 13 15 17 18 20 19 17 15 13 14 ​ 185  51%
≤ 20 mph 16 15 17 19 21 21 23 23 21 19 17 17 ​ 228  63%
≤ 30 mph 18 17 19 21 23 22 24 24 22 21 18 19 ​ 247  68%
≤ 40 mph 18 17 19 21 23 22 24 24 22 21 19 19 ​ 250  68%
any wind 19 17 19 21 23 22 24 24 22 21 19 19 ​ 251  69%
‘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 24 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     −0.1 −0.1   ​−0.3
≤ 10 mph   −0.1 −0.1 +0.1   −0.1 −0.1 −0.2   −0.1 −0.2 −0.1 ​−0.8
≤ 15 mph +0.1 −0.2 −0.1 +0.2 +0.2 +0.1 −0.1 −0.1 +0.2 −0.1 −0.1   ​+0.1
≤ 20 mph +0.1 −0.1   +0.2 +0.3 +0.1 +0.1 +0.1 +0.2       ​+1.1
≤ 30 mph +0.1 −0.1 +0.2 +0.2 +0.2 +0.2 +0.1 +0.1 +0.2 −0.1 −0.1 +0.1 ​+1.1
≤ 40 mph +0.1 −0.1 +0.2 +0.2 +0.3 +0.2 +0.1 +0.1 +0.3 −0.1 −0.1 +0.1 ​+1.2
any wind +0.1 −0.1 +0.2 +0.2 +0.3 +0.2 +0.1 +0.1 +0.3 −0.1 −0.1 +0.1 ​+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 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 25 22 24 25 27 25 28 28 26 26 24 25 ​ 304  83%

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 21 24 25 26 25 26 26 25 24 22 23 ​ 288  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 2 2 2 2 2 2 3 3 2 2 2 ​ 28  8%
≤ 10 mph 10 9 10 10 11 11 12 12 11 10 11 10 ​ 127  35%
≤ 15 mph 21 18 21 21 23 24 25 25 23 21 20 21 ​ 263  72%
≤ 20 mph 26 24 27 27 28 28 29 29 28 27 26 26 ​ 324  89%
≤ 30 mph 29 27 30 30 31 30 31 31 29 30 29 29 ​ 355  97%
≤ 40 mph 30 28 30 30 31 30 31 31 30 31 30 30 ​ 362  99%
Please send any comments, questions, or corrections to me, Mike Cowlishaw, at mfc@speleotrove.com.

All text Copyright © Mike Cowlishaw 2008, 2021. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2021-05-09.