Pembrey Sands, 18:00 to 20:00, 1997–2015
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Met Office station 1226: Pembrey Sands, Dyfed  (SA17 4); OS grid reference: SN 365043.
Coordinates:  N51°42'47" W4°22'05"  (51.713 -4.368), elevation 3 m.
Note: gusts not recorded in 8 out of the 19 years, 2.8% of daylight visibility records missing, 2.6% of daylight precipitation records missing, 2.3% of daylight wind records missing.

This is the analysis for the average of 19 years  (1997–2015).
Time slot: 18:00 to 20:00  (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 0 1 2 1 1 1 0 0 0 0  6  2%
≤ 10 mph 0 0 0 2 7 6 6 4 0 0 0 0  25  7%
≤ 15 mph 0 0 0 4 15 15 14 9 0 0 0 0  57  16%
≤ 20 mph 0 0 0 5 19 20 20 14 0 0 0 0  79  22%
≤ 30 mph 0 0 0 7 25 24 25 17 0 0 0 0  99  27%
≤ 40 mph 0 0 0 7 26 25 26 18 0 0 0 0  101  28%
any wind 0 0 0 7 26 25 26 18 0 0 0 0  101  28%
‘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         −0.1   −0.1 −0.1           
≤ 10 mph         −0.2 +0.1   −0.4          −0.1
≤ 15 mph         −0.2 +0.1 −0.1 −0.2           
≤ 20 mph           +0.1 −0.1 −0.1           
≤ 30 mph         +0.1 +0.1               
≤ 40 mph         +0.1 +0.2 +0.1             
any wind         +0.2 +0.2 +0.1             
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 0 0 0 7 28 26 28 19 0 0 0 0  107  29%

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 26 25 28 28 28 28 28 28 27 26 25 25  322  88%

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 3 2 2 2 3 3 3 3  33  9%
≤ 10 mph 10 9 10 8 9 8 7 7 10 10 10 11  110  30%
≤ 15 mph 17 17 20 18 18 18 16 17 19 18 17 17  211  58%
≤ 20 mph 21 20 24 24 22 23 23 24 23 21 20 21  268  73%
≤ 30 mph 27 25 29 29 29 29 30 30 28 28 26 26  339  93%
≤ 40 mph 30 27 31 30 31 30 31 31 30 30 28 29  358  98%

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.