Manston, 10:00 to 12:00, 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, 3.6% of daylight precipitation records missing, 1.4% of daylight wind records missing.

This is the analysis for the average of 19 years  (1997–2015).
Time slot: 10:00 to 12:00  (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 1 1 0 1 1 1 1 0 1  8  2%
≤ 10 mph 4 4 5 6 7 7 7 8 6 6 5 5  70  19%
≤ 15 mph 11 11 13 15 17 17 18 18 17 13 12 13  174  48%
≤ 20 mph 15 15 17 20 21 20 21 22 21 18 16 18  223  61%
≤ 30 mph 17 18 20 22 22 21 23 23 23 21 18 20  248  68%
≤ 40 mph 17 19 20 22 23 22 23 24 23 21 19 20  252  69%
any wind 18 19 20 22 23 22 23 24 23 21 19 21  254  70%
‘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 19 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 −0.1           
≤ 10 mph −0.2     +0.1 −0.2 −0.1 −0.4 −0.4   −0.2 −0.2    −0.1
≤ 15 mph −0.2     +0.2   −0.1 −0.2 −0.3   −0.2 −0.3    −0.1
≤ 20 mph −0.2   +0.2 +0.2 +0.2     −0.1 +0.2 −0.1 −0.2     
≤ 30 mph −0.2 −0.1 +0.2 +0.2 +0.1 +0.1 +0.1   +0.2 −0.2 −0.2 +0.2   
≤ 40 mph −0.2 −0.1 +0.3 +0.2 +0.1 +0.1 +0.1   +0.2 −0.2 −0.1 +0.2   
any wind −0.2 −0.1 +0.3 +0.2 +0.2 +0.1 +0.1   +0.2 −0.2 −0.1 +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 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 24 23 25 26 27 25 28 28 26 27 24 26  309  85%

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 21 22 24 25 26 25 25 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 1 1 1 1 2 1 2 2  17  5%
≤ 10 mph 8 7 8 8 9 10 10 10 8 8 9 7  100  28%
≤ 15 mph 18 17 19 19 21 23 24 23 22 19 19 18  242  66%
≤ 20 mph 25 22 26 26 27 28 28 28 27 26 24 26  313  86%
≤ 30 mph 29 27 30 29 30 30 31 31 29 30 29 29  352  96%
≤ 40 mph 30 28 30 30 31 30 31 31 30 31 29 30  361  99%

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.