Wittering, 14:00 to 16:00, 1997–2020
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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 24 years, 1.0% of daylight visibility records missing, 1.2% of daylight precipitation records missing, 0.6% of daylight wind records missing.

This is the analysis for the average of 24 years  (1997–2020).
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 1 2 1 1 1 ​ 13  4%
≤ 10 mph 5 4 5 6 6 6 6 6 7 6 5 6 ​ 68  19%
≤ 15 mph 11 10 12 14 14 15 16 15 15 14 13 12 ​ 160  44%
≤ 20 mph 15 14 17 18 19 19 21 20 20 18 16 15 ​ 211  58%
≤ 30 mph 18 16 20 20 21 21 23 21 22 20 18 18 ​ 238  65%
≤ 40 mph 19 17 20 21 22 21 23 22 22 21 18 18 ​ 245  67%
any wind 19 18 21 21 22 21 23 22 23 22 19 19 ​ 248  68%
‘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 24 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   ​−0.2
≤ 10 mph +0.1           −0.1 −0.3     +0.1 −0.1 ​−0.2
≤ 15 mph +0.2 +0.1   +0.1 +0.1 +0.1   −0.3 +0.1 +0.1 +0.1   ​+0.6
≤ 20 mph +0.2 +0.1   +0.2 +0.1 +0.1 +0.1 −0.2 +0.1 +0.2 +0.1 −0.1 ​+0.9
≤ 30 mph +0.2     +0.2 +0.1 +0.1 +0.1 −0.1 +0.2 +0.1 +0.1   ​+1.0
≤ 40 mph +0.2   +0.1 +0.3 +0.1 +0.1 +0.2 −0.1 +0.2 +0.2 +0.1   ​+1.3
any wind +0.2   +0.1 +0.3 +0.2 +0.1 +0.2 −0.1 +0.2 +0.2 +0.2   ​+1.5
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 26 25 28 28 29 28 30 29 28 28 25 24 ​ 327  90%

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 22 23 22 23 22 23 23 21 22 ​ 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 2 1 1 1 1 2 1 2 2 2 2 3 ​ 21  6%
≤ 10 mph 9 7 7 8 8 9 7 8 9 8 9 10 ​ 98  27%
≤ 15 mph 18 15 17 18 19 20 21 21 19 19 20 20 ​ 227  62%
≤ 20 mph 24 21 24 25 25 26 27 28 26 25 26 25 ​ 302  83%
≤ 30 mph 29 26 29 29 30 29 30 30 29 29 29 29 ​ 347  95%
≤ 40 mph 30 27 30 30 31 30 31 31 30 31 30 30 ​ 359  98%
Please send any comments, questions, or corrections to me, Mike Cowlishaw, at mfc@speleotrove.com.

All text Copyright © Mike Cowlishaw 2008, 2021. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2021-05-09.