Yeovilton, 06:00 to 08:00, 1997–2017
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Met Office station 1302: Yeovilton, Somerset  (BA22 8); OS grid reference: ST 551232.
Coordinates:  N51°00'22" W2°38'24"  (51.006 -2.640), elevation 20 m.
Note: gusts not recorded in 6 out of the 21 years, 0.6% of daylight visibility records missing, 1.7% of daylight precipitation records missing, 0.6% of daylight wind records missing.

This is the analysis for the average of 21 years  (1997–2017).
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 3 7 6 8 9 8 7 2 0 0  52  14%
≤ 10 mph 0 0 7 13 13 15 16 16 13 5 0 0  97  27%
≤ 15 mph 0 0 9 16 17 19 19 19 15 6 0 0  121  33%
≤ 20 mph 0 0 9 17 18 19 20 19 15 7 0 0  124  34%
≤ 30 mph 0 0 9 17 19 19 20 19 15 7 0 0  125  34%
≤ 40 mph 0 0 9 17 19 19 20 19 15 7 0 0  126  34%
any wind 0 0 9 17 19 19 20 19 15 7 0 0  126  34%
‘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 −0.1       −0.1
≤ 10 mph       +0.2 +0.1 +0.1 +0.1 +0.2         +0.6
≤ 15 mph       +0.3 +0.2 +0.1 +0.1 +0.3         +0.9
≤ 20 mph       +0.2 +0.2 +0.1 +0.2 +0.3         +0.9
≤ 30 mph       +0.3 +0.2 +0.1 +0.2 +0.3         +0.9
≤ 40 mph       +0.3 +0.2 +0.1 +0.2 +0.3         +0.9
any wind       +0.3 +0.2 +0.1 +0.2 +0.3         +0.9
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 12 21 23 23 23 23 19 9 0 0  153  42%

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 18 22 23 24 23 25 24 23 21 18 19  259  71%

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 8 8 12 13 11 12 14 14 15 11 11 9  137  37%
≤ 10 mph 18 16 21 21 21 22 24 26 25 21 20 19  254  69%
≤ 15 mph 25 23 27 27 28 29 30 30 29 28 26 25  327  90%
≤ 20 mph 28 25 29 29 30 30 31 31 30 29 28 28  348  95%
≤ 30 mph 30 27 30 30 31 30 31 31 30 30 29 30  359  98%
≤ 40 mph 31 28 31 30 31 30 31 31 30 31 30 31  364  100%

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.