Pembrey Sands, 08:00 to 10:00, 1997–2020
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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 6 out of the 24 years, 2.2% of daylight visibility records missing, 2.7% of daylight precipitation records missing, 1.9% 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 2 2 3 3 3 2 4 4 4 3 3 2 ​ 36  10%
≤ 10 mph 7 6 8 9 9 9 10 9 9 9 8 7 ​ 99  27%
≤ 15 mph 11 10 14 16 16 16 16 16 16 13 12 11 ​ 166  45%
≤ 20 mph 13 12 16 19 19 19 20 19 18 16 14 14 ​ 198  54%
≤ 30 mph 17 15 19 22 22 22 23 22 22 20 18 18 ​ 238  65%
≤ 40 mph 18 16 20 22 23 22 23 22 22 21 19 19 ​ 246  67%
any wind 18 17 20 22 23 22 23 22 22 21 19 19 ​ 249  68%
‘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         ​−0.2
≤ 10 mph     −0.1 +0.1 +0.1 +0.1   −0.1   +0.1 +0.1 −0.1 ​+0.1
≤ 15 mph   +0.1 −0.1 +0.3 +0.2 +0.1 +0.2 −0.1 +0.1 +0.2 +0.1 −0.1 ​+1.0
≤ 20 mph   +0.1   +0.3 +0.3 +0.2 +0.2 −0.1 +0.2 +0.2 +0.1 −0.1 ​+1.3
≤ 30 mph   +0.2   +0.2 +0.2 +0.2 +0.3 +0.1 +0.3 +0.2 +0.1 −0.1 ​+1.7
≤ 40 mph +0.1 +0.2 +0.1 +0.2 +0.2 +0.3 +0.3 +0.1 +0.3 +0.2 +0.2   ​+2.1
any wind +0.1 +0.2 +0.2 +0.2 +0.2 +0.3 +0.3 +0.1 +0.3 +0.2 +0.2   ​+2.4
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 21 19 22 24 26 24 25 24 24 24 22 22 ​ 278  76%

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 24 23 27 26 27 26 27 26 26 25 23 24 ​ 302  83%

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 5 4 5 4 5 3 4 5 5 5 5 4 ​ 55  15%
≤ 10 mph 11 10 13 12 12 11 12 12 12 11 11 11 ​ 137  38%
≤ 15 mph 17 16 20 21 20 20 20 20 20 17 17 17 ​ 225  62%
≤ 20 mph 20 20 24 25 24 24 25 25 23 22 20 20 ​ 272  74%
≤ 30 mph 27 25 29 29 30 29 30 30 29 28 26 27 ​ 339  93%
≤ 40 mph 30 27 30 30 31 30 31 31 30 30 29 30 ​ 358  98%
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.