Wittering, 06:00 to 08:00, 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, 0.4% of daylight visibility records missing, 0.3% of daylight wind records missing.

This is the analysis for the average of 24 years  (1997–2020).
Time slot: 06:00 to 08:00  (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 2 3 3 3 3 3 1 0 0 ​ 18  5%
≤ 10 mph 0 0 5 8 10 9 12 11 10 5 0 0 ​ 70  19%
≤ 15 mph 0 0 9 15 17 17 20 19 17 9 0 0 ​ 123  34%
≤ 20 mph 0 0 11 17 20 20 21 20 18 10 0 0 ​ 137  37%
≤ 30 mph 0 0 11 17 20 20 22 21 18 10 0 0 ​ 140  38%
≤ 40 mph 0 0 12 17 20 20 22 21 18 10 0 0 ​ 141  39%
any wind 0 0 12 17 20 20 22 21 18 10 0 0 ​ 141  39%
‘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 −0.1       ​−0.2
≤ 10 mph       +0.1 +0.1 +0.1 +0.2 −0.1 +0.1       ​+0.5
≤ 15 mph       +0.3 +0.3 +0.1 +0.4 +0.2 +0.1       ​+1.5
≤ 20 mph       +0.3 +0.2 +0.1 +0.4 +0.3 +0.2       ​+1.6
≤ 30 mph       +0.2 +0.3 +0.2 +0.4 +0.3 +0.2 +0.1     ​+1.7
≤ 40 mph     +0.1 +0.2 +0.3 +0.2 +0.4 +0.3 +0.2 +0.1     ​+1.8
any wind     +0.1 +0.2 +0.3 +0.2 +0.4 +0.3 +0.2 +0.1     ​+1.8
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 15 21 24 24 25 24 22 13 0 0 ​ 168  46%

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 18 21 23 24 23 25 25 23 22 20 21 ​ 266  73%

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 4 4 4 4 4 5 5 4 3 4 ​ 49  13%
≤ 10 mph 12 11 15 15 15 15 17 18 17 15 12 11 ​ 171  47%
≤ 15 mph 22 21 24 26 26 26 28 28 27 26 24 22 ​ 301  82%
≤ 20 mph 27 25 28 29 30 29 31 30 29 29 28 27 ​ 342  94%
≤ 30 mph 30 27 30 30 31 30 31 31 30 31 30 30 ​ 359  98%
≤ 40 mph 30 28 31 30 31 30 31 31 30 31 30 31 ​ 363  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.