Wittering, 18:00 to 20:00, 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, 0.6% of daylight visibility records missing, 0.3% of daylight wind records missing.

This is the analysis for the average of 21 years  (1997–2017).
Time slot: 18:00 to 20:00  (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 0 0 1 2 2 1 0 0 0 0  6  2%
≤ 10 mph 0 0 0 0 7 8 8 4 0 0 0 0  27  7%
≤ 15 mph 0 0 0 0 17 17 19 9 0 0 0 0  62  17%
≤ 20 mph 0 0 0 0 21 21 22 10 0 0 0 0  74  20%
≤ 30 mph 0 0 0 0 22 21 23 11 0 0 0 0  77  21%
≤ 40 mph 0 0 0 0 22 22 23 11 0 0 0 0  78  21%
any wind 0 0 0 0 22 22 23 11 0 0 0 0  78  21%
‘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             −0.3 −0.1         −0.4
≤ 15 mph         +0.1   −0.1 −0.1         −0.2
≤ 20 mph         +0.1 +0.1 −0.1           +0.1
≤ 30 mph         +0.1 +0.1 −0.1           +0.1
≤ 40 mph         +0.1 +0.1 −0.1           +0.2
any wind         +0.1 +0.1 −0.1           +0.2
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 0 0 0 29 28 29 14 0 0 0 0  101  28%

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 23 22 23 22 24 23 21 21  263  72%

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 3 3 2 1 3 2 3 4 4 3 4  35  10%
≤ 10 mph 11 12 12 10 10 11 11 13 15 15 13 12  145  40%
≤ 15 mph 22 20 23 22 23 24 25 26 26 25 24 22  280  77%
≤ 20 mph 26 24 28 28 29 29 30 30 29 28 27 27  334  91%
≤ 30 mph 29 27 30 30 31 29 31 31 30 30 29 30  356  98%
≤ 40 mph 30 28 31 30 31 30 31 31 30 31 30 30  363  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.