Wittering, 08:00 to 10:00, 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, 1.3% of daylight precipitation records missing, 0.5% of daylight wind records missing.

This is the analysis for the average of 21 years  (1997–2017).
Time slot: 08:00 to 10:00  (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 2 2 3 2 2 1 0 1  17  5%
≤ 10 mph 4 4 6 6 7 9 9 9 8 7 5 4  79  22%
≤ 15 mph 11 11 12 15 15 16 18 17 16 14 12 11  167  46%
≤ 20 mph 13 13 15 18 19 20 22 21 18 16 14 14  204  56%
≤ 30 mph 15 15 17 19 21 21 22 22 19 18 15 16  220  60%
≤ 40 mph 15 15 17 20 21 21 23 22 19 18 16 16  224  61%
any wind 16 16 17 20 22 21 23 22 19 18 16 16  225  62%
‘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 −0.1 −0.1   −0.1 −0.1         −0.5
≤ 10 mph −0.1 −0.1 −0.1 −0.1 −0.1 +0.2 +0.1 −0.2 +0.1 +0.2     −0.1
≤ 15 mph −0.1 +0.1   +0.2 +0.1 +0.1 +0.2   +0.3 +0.1 +0.1 −0.1 +1.1
≤ 20 mph   −0.1 +0.1 +0.3 +0.1 +0.2 +0.2 +0.1 +0.2 +0.2 +0.2 −0.1 +1.5
≤ 30 mph −0.1 −0.1   +0.2 +0.1 +0.2 +0.2 +0.2 +0.3 +0.1 +0.2 −0.1 +1.3
≤ 40 mph −0.1 −0.1 +0.1 +0.2 +0.2 +0.3 +0.2 +0.2 +0.3 +0.2 +0.2 −0.1 +1.6
any wind   −0.1 +0.1 +0.2 +0.2 +0.3 +0.2 +0.2 +0.3 +0.2 +0.2   +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 22 20 21 23 26 25 27 26 23 22 21 22  278  76%

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 19 19 22 24 23 23 24 25 23 23 20 21  267  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 4 2 3 3 3 3 4 3 4 3 3 4  37  10%
≤ 10 mph 11 10 12 10 10 13 13 14 13 12 12 11  141  39%
≤ 15 mph 22 20 22 22 22 23 25 25 24 25 23 22  276  76%
≤ 20 mph 26 24 27 27 28 28 30 29 28 29 28 27  331  91%
≤ 30 mph 30 27 30 29 30 29 31 31 30 30 29 30  357  98%
≤ 40 mph 30 28 31 30 31 30 31 31 30 31 30 31  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.