Yeovilton, 14:00 to 16:00, 1997–2020
 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 24 years, 0.9% of daylight visibility records missing, 1.4% of daylight precipitation records missing, 0.5% of daylight wind records missing.

This is the analysis for the average of 24 years  (1997–2020).
Time slot: 14:00 to 16:00  (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 2 2 2 2 1 2 1 1 2 2 2 2 ​ 21  6%
≤ 10 mph 6 5 5 7 7 7 7 7 7 7 7 8 ​ 80  22%
≤ 15 mph 12 11 14 15 16 17 17 17 18 15 14 14 ​ 180  49%
≤ 20 mph 15 15 18 19 20 21 22 21 21 18 17 16 ​ 224  61%
≤ 30 mph 17 17 20 22 23 22 23 23 22 20 18 18 ​ 245  67%
≤ 40 mph 18 18 21 22 23 22 23 23 23 21 18 18 ​ 249  68%
any wind 18 18 21 22 23 22 23 23 23 21 18 19 ​ 250  69%
‘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
≤ 10 mph   −0.1 −0.1 +0.1     −0.1 −0.2   −0.1     ​−0.4
≤ 15 mph −0.1   −0.1 +0.3 +0.2     −0.3 +0.1        
≤ 20 mph −0.1   −0.1 +0.3 +0.3     −0.2         ​+0.2
≤ 30 mph −0.1 −0.1 −0.1 +0.2 +0.3   +0.1 −0.1       −0.1  
≤ 40 mph −0.1 −0.1 −0.1 +0.2 +0.3   +0.1 −0.1         ​+0.2
any wind −0.1     +0.2 +0.3   +0.1 −0.1         ​+0.3
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 24 23 26 27 28 27 28 28 27 27 25 25 ​ 317  87%

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 23 23 24 23 24 24 24 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 2 2 2 2 2 2 2 2 2 4 4 ​ 29  8%
≤ 10 mph 10 7 8 8 9 9 9 9 9 9 11 13 ​ 110  30%
≤ 15 mph 20 17 19 20 21 22 22 22 22 21 22 22 ​ 250  69%
≤ 20 mph 25 22 25 25 27 27 29 29 27 27 26 26 ​ 316  86%
≤ 30 mph 29 27 29 30 30 29 31 31 29 29 29 29 ​ 351  96%
≤ 40 mph 30 28 30 30 31 30 31 31 30 31 30 31 ​ 361  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.