Yeovilton, 12:00 to 14:00, 1997–2015
 Home 



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 19 years, 1.1% of daylight visibility records missing, 1.8% of daylight precipitation records missing, 0.6% of daylight wind records missing.

This is the analysis for the average of 19 years  (1997–2015).
Time slot: 12:00 to 14:00  (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 2 2 2 2 3 2 2 2 2 3 3  27  7%
≤ 10 mph 6 5 6 7 7 8 8 8 9 7 7 8  85  23%
≤ 15 mph 11 11 15 15 15 18 18 18 18 15 13 13  179  49%
≤ 20 mph 14 14 19 19 20 21 21 21 21 18 16 16  221  60%
≤ 30 mph 16 16 20 21 22 22 23 22 22 20 18 18  240  66%
≤ 40 mph 17 17 21 22 22 22 23 22 22 20 18 18  245  67%
any wind 17 17 21 22 22 23 23 22 23 20 18 18  246  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 19 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             −0.3 −0.2 −0.1        −0.1
≤ 10 mph   −0.1       +0.1 −0.2 −0.6     −0.1    −0.1
≤ 15 mph     +0.1 +0.3   +0.2 −0.2 −0.6 +0.3 +0.1 −0.1     
≤ 20 mph     +0.1 +0.4 +0.1 +0.3 −0.2 −0.4 +0.2 +0.1 −0.2     
≤ 30 mph   −0.1 +0.1 +0.3 +0.2 +0.2 −0.1 −0.3 +0.1   −0.2     
≤ 40 mph   −0.1 +0.1 +0.3 +0.2 +0.2 −0.1 −0.3 +0.2   −0.2     
any wind +0.1 −0.1 +0.1 +0.3 +0.2 +0.2 −0.1 −0.3 +0.2   −0.2     
Empty cells indicate negligible change; ‘Total’ shows the average trend 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 26 26 28 27 28 27 27 26 23 24  306  84%

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 20 24 23 23 24 23 23 24 22 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 3 3 3 3 2 4 3 3 3 3 4 5  39  11%
≤ 10 mph 11 9 9 9 9 10 10 11 11 9 11 12  120  33%
≤ 15 mph 20 17 20 20 21 23 23 24 22 21 21 21  253  69%
≤ 20 mph 24 23 26 26 27 27 28 28 27 27 26 26  315  86%
≤ 30 mph 29 27 29 29 30 30 30 30 29 30 29 29  351  96%
≤ 40 mph 30 28 30 30 31 30 31 31 30 31 30 30  362  99%

Please send any comments, questions, or corrections to me, Mike Cowlishaw, at mfc@speleotrove.com.

All text Copyright © Mike Cowlishaw 2008, 2017. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2017-01-01.