Wittering, 10:00 to 12:00, 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, 1.1% of daylight visibility records missing, 1.3% of daylight precipitation records missing, 0.8% of daylight wind records missing.

This is the analysis for the average of 24 years  (1997–2020).
Time slot: 10:00 to 12:00  (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 2 1 2 2 2 2 1 1 1 ​ 16  4%
≤ 10 mph 4 3 5 7 7 8 8 8 7 5 4 4 ​ 72  20%
≤ 15 mph 10 8 12 14 15 16 18 17 16 13 11 11 ​ 162  44%
≤ 20 mph 14 13 16 19 20 20 22 22 20 18 15 14 ​ 212  58%
≤ 30 mph 16 15 19 21 22 22 23 23 21 20 17 16 ​ 236  65%
≤ 40 mph 17 16 20 22 22 22 23 24 22 21 17 17 ​ 242  66%
any wind 17 16 20 22 22 22 23 24 22 21 17 17 ​ 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 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       −0.1 ​−0.3
≤ 10 mph           +0.1 +0.1 −0.2 −0.1 +0.1 +0.1 −0.1  
≤ 15 mph +0.1 +0.1   +0.2 +0.2 +0.1   −0.2 +0.1 +0.2 +0.1 −0.1 ​+0.7
≤ 20 mph +0.1   +0.1 +0.2 +0.2 +0.1 +0.1   +0.1 +0.2 +0.2   ​+1.3
≤ 30 mph +0.1 −0.1   +0.2 +0.2 +0.1 +0.1 +0.1 +0.1 +0.2 +0.1   ​+1.2
≤ 40 mph +0.2 −0.1 +0.1 +0.3 +0.2 +0.2 +0.1 +0.1 +0.2 +0.2 +0.1   ​+1.5
any wind +0.2   +0.1 +0.3 +0.2 +0.2 +0.1 +0.1 +0.2 +0.2 +0.1   ​+1.7
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 23 21 25 27 28 27 28 28 26 26 22 23 ​ 304  83%

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 23 23 23 23 24 25 24 24 21 21 ​ 271  74%

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 2 2 2 3 2 2 2 3 4 ​ 29  8%
≤ 10 mph 10 7 8 9 9 10 11 11 10 9 10 10 ​ 114  31%
≤ 15 mph 20 16 20 19 21 22 23 23 21 20 20 21 ​ 245  67%
≤ 20 mph 25 22 25 26 27 28 29 28 27 26 26 26 ​ 314  86%
≤ 30 mph 29 26 29 29 30 29 31 31 29 30 29 30 ​ 351  96%
≤ 40 mph 30 27 30 30 31 30 31 31 30 31 30 31 ​ 361  99%
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.