Wittering, 16:00 to 18:00, 1997–2017
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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 5 out of the 21 years, 0.7% of daylight visibility records missing, 0.2% of daylight wind records missing.

This is the analysis for the average of 21 years  (1997–2017).
Time slot: 16:00 to 18:00  (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 0 0 1 1 1 1 1 2 2 0 0 0  8  2%
≤ 10 mph 0 1 6 5 5 6 6 6 7 1 0 0  45  12%
≤ 15 mph 0 2 14 13 14 14 15 16 17 3 0 0  109  30%
≤ 20 mph 0 3 17 18 18 19 20 20 20 4 0 0  141  39%
≤ 30 mph 0 4 20 21 21 21 22 22 22 4 0 0  157  43%
≤ 40 mph 0 4 20 21 22 21 22 22 22 4 0 0  159  44%
any wind 0 4 21 21 22 21 22 22 22 4 0 0  160  44%
‘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          
≤ 10 mph   +0.1 +0.1       −0.1 −0.2         −0.1
≤ 15 mph   +0.1 +0.2 +0.1       −0.2 +0.1       +0.3
≤ 20 mph   +0.1 +0.2 +0.2     +0.1 −0.1 +0.1       +0.7
≤ 30 mph   +0.1 +0.2 +0.3 +0.1 +0.1 +0.1   +0.1       +1.0
≤ 40 mph   +0.1 +0.2 +0.3 +0.1 +0.1 +0.2   +0.1       +1.1
any wind   +0.1 +0.3 +0.3 +0.1 +0.1 +0.2 +0.1 +0.1       +1.2
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 0 6 28 28 29 28 29 29 28 6 0 0  211  58%

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 20 19 22 22 22 22 23 23 23 23 21 22  260  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 3 2 2 1 1 2 1 2 2 3 4 4  25  7%
≤ 10 mph 11 9 8 7 8 9 8 9 9 11 13 12  113  31%
≤ 15 mph 21 17 19 18 19 21 21 22 22 22 23 22  249  68%
≤ 20 mph 26 22 25 26 26 27 28 28 27 27 27 26  316  86%
≤ 30 mph 30 27 30 29 30 30 31 31 29 30 29 30  354  97%
≤ 40 mph 31 27 31 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, 2018. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2018-02-09.