Wittering, 14:00 to 16:00, 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, 0.6% of daylight visibility records missing, 1.1% of daylight precipitation records missing, 0.3% of daylight wind records missing.

This is the analysis for the average of 19 years  (1997–2015).
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 1 1 1 1 2 2 1 1 1  14  4%
≤ 10 mph 4 4 5 6 6 7 6 6 8 5 5 5  67  18%
≤ 15 mph 10 10 12 13 13 15 15 15 15 14 12 12  156  43%
≤ 20 mph 15 13 17 18 18 19 20 20 20 18 16 15  208  57%
≤ 30 mph 17 16 20 20 21 21 22 21 22 20 18 18  235  64%
≤ 40 mph 18 17 20 20 21 21 22 22 22 21 18 18  241  66%
any wind 19 17 20 21 21 21 22 22 22 21 18 19  244  67%
‘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     
≤ 10 mph −0.1 +0.1 +0.1   −0.2   −0.2 −0.4 +0.2     −0.1   
≤ 15 mph   +0.1 +0.1 +0.1 −0.1 +0.1 −0.2 −0.5 +0.1 +0.2 +0.1 −0.1   
≤ 20 mph +0.1 +0.1 +0.1 +0.2 −0.3 +0.2 −0.1 −0.3 +0.2 +0.4 +0.1 −0.1  +0.1
≤ 30 mph +0.1 −0.1   +0.3 −0.1 +0.2 −0.1 −0.2 +0.2 +0.2 +0.1    +0.1
≤ 40 mph +0.1 −0.1 +0.1 +0.4   +0.2   −0.2 +0.2 +0.3 +0.2 +0.1  +0.1
any wind +0.2 −0.1 +0.1 +0.4   +0.2   −0.2 +0.3 +0.3 +0.2 +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 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 24 28 27 29 28 29 29 28 28 25 25  325  89%

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 19 22 21 22 22 22 22 23 23 21 21  259  71%

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 2 1 2 2 1 2 2  21  6%
≤ 10 mph 8 7 7 8 7 9 7 9 9 8 9 9  98  27%
≤ 15 mph 18 15 17 18 18 20 20 21 20 19 20 19  225  62%
≤ 20 mph 24 21 24 25 25 26 27 28 26 25 25 25  302  83%
≤ 30 mph 29 26 29 29 30 29 30 30 29 29 29 29  348  95%
≤ 40 mph 30 28 30 30 31 30 31 31 30 31 30 30  360  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.