Wittering, any hour sunrise to sunset, 1997–2015
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Met Office station 583: Wittering, Cambridgeshire  (PE8 6); OS grid reference: TF 042026.
Coordinates:  N52°36'40" W0°27'32"  (52.611 -0.459), elevation 73 m.
Note: gusts not recorded in 4 out of the 19 years, 0.5% of daylight visibility records missing, 0.3% 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 4 7 9 11 14 14 14 10 7 5 4  104  28%  366  8%
≤ 10 mph 13 13 18 19 22 25 27 25 22 18 15 12  228  62%  1279  26%
≤ 15 mph 21 21 25 27 29 29 31 30 28 27 24 21  313  86%  2439  50%
≤ 20 mph 24 24 28 29 30 29 31 31 29 29 26 24  333  91%  2936  60%
≤ 30 mph 26 26 29 29 30 29 31 31 29 29 27 26  343  94%  3170  65%
≤ 40 mph 26 26 29 29 30 29 31 31 29 30 27 26  343  94%  3210  66%
any wind 27 26 29 29 30 29 31 31 29 30 27 26  344  94%  3227  66%
‘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   −0.4       −0.2  −0.1
≤ 10 mph −0.1     +0.1 −0.1 +0.1   −0.3 +0.1 +0.2 +0.1 −0.2   
≤ 15 mph       +0.1       −0.1   +0.2   +0.1   
≤ 20 mph   −0.1 +0.1 +0.1         +0.1 +0.2 −0.1     
≤ 30 mph   −0.3 +0.1           +0.1 +0.1   +0.1   
≤ 40 mph   −0.3 +0.1           +0.1 +0.1   +0.1   
any wind   −0.2 +0.1           +0.1 +0.1   +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 31 30 31 31 30 30 28 28  354  97%

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 29 27 30 29 31 30 31 31 30 30 29 29  355  97%

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 4 7 9 11 14 14 14 10 7 5 4  104  28%
≤ 10 mph 13 13 18 19 22 25 27 25 22 18 15 12  228  62%
≤ 15 mph 21 21 25 27 29 29 31 30 28 27 24 21  313  86%
≤ 20 mph 24 24 28 29 30 29 31 31 29 29 26 24  333  91%
≤ 30 mph 26 26 29 29 30 29 31 31 29 29 27 26  343  94%
≤ 40 mph 26 26 29 29 30 29 31 31 29 30 27 26  343  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.