Yeovilton, 08:00 to 10:00, 1997–2020
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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 24 years, 1.0% of daylight visibility records missing, 1.6% 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: 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 3 3 4 4 3 4 5 5 5 4 3 3 ​ 48  13%
≤ 10 mph 9 8 8 9 10 12 14 12 12 10 8 9 ​ 120  33%
≤ 15 mph 13 12 13 16 17 19 21 19 17 14 12 12 ​ 186  51%
≤ 20 mph 15 13 15 19 20 21 22 20 18 15 13 13 ​ 203  56%
≤ 30 mph 15 14 16 20 21 21 23 20 18 16 13 14 ​ 210  57%
≤ 40 mph 16 14 16 20 21 21 23 20 19 16 13 14 ​ 212  58%
any wind 16 14 16 20 21 21 23 20 19 16 13 14 ​ 212  58%
‘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   −0.1 −0.1 −0.1 −0.1 −0.1 ​−0.4
≤ 10 mph +0.1 +0.1 −0.1 +0.1 +0.2 −0.1 +0.1 +0.1     −0.1 −0.1 ​+0.4
≤ 15 mph +0.1 +0.1   +0.2 +0.3 +0.1 +0.2 +0.1 +0.1       ​+1.4
≤ 20 mph +0.1 +0.1   +0.2 +0.3 +0.1 +0.2 +0.2 +0.1   +0.1   ​+1.3
≤ 30 mph +0.1 +0.1 +0.1 +0.2 +0.3 +0.1 +0.2 +0.2 +0.1   +0.1   ​+1.4
≤ 40 mph +0.1 +0.1 +0.1 +0.2 +0.3 +0.1 +0.2 +0.2 +0.1   +0.1   ​+1.5
any wind +0.1 +0.1 +0.1 +0.2 +0.3 +0.1 +0.2 +0.2 +0.1   +0.1   ​+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 22 19 21 23 25 25 26 25 22 22 20 21 ​ 270  74%

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 20 18 22 24 24 23 25 24 24 21 18 19 ​ 260  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 7 7 9 7 6 6 7 8 9 9 9 9 ​ 93  26%
≤ 10 mph 17 15 16 14 15 16 18 18 19 18 19 18 ​ 204  56%
≤ 15 mph 25 23 25 25 26 26 28 29 27 27 26 25 ​ 311  85%
≤ 20 mph 28 25 28 28 29 29 30 30 29 29 28 28 ​ 342  94%
≤ 30 mph 30 27 30 30 31 30 31 31 30 30 29 30 ​ 357  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.