Pembrey Sands, 10:00 to 12:00, 1997–2019
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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 23 years, 2.3% of daylight visibility records missing, 3.1% of daylight precipitation records missing, 2.1% of daylight wind records missing.

This is the analysis for the average of 23 years  (1997–2019).
Time slot: 10:00 to 12:00  (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 2 2 1 1 0 0 1 2 3 4 3  21  6%
≤ 10 mph 7 5 6 6 6 5 7 6 6 7 8 7  77  21%
≤ 15 mph 11 11 13 14 14 15 15 14 14 13 12 11  157  43%
≤ 20 mph 14 14 17 18 18 19 20 19 18 16 14 14  200  55%
≤ 30 mph 17 17 20 22 22 22 23 23 22 21 18 18  246  67%
≤ 40 mph 18 18 21 23 23 22 23 23 23 22 19 19  256  70%
any wind 19 18 22 23 23 22 23 23 23 23 20 20  259  71%
‘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 23 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       −0.3
≤ 10 mph       +0.1 +0.2 +0.1 −0.1 −0.2 −0.1 +0.1 +0.1 −0.1 −0.1
≤ 15 mph   +0.1 +0.1 +0.1 +0.1 +0.3 +0.1 −0.2   +0.4 +0.2 −0.1 +1.1
≤ 20 mph   +0.2 +0.1 +0.2 +0.3 +0.4 +0.2     +0.4 +0.2 −0.1 +2.0
≤ 30 mph +0.1 +0.2 +0.2 +0.2 +0.2 +0.4 +0.3 +0.2 +0.2 +0.5 +0.2   +2.7
≤ 40 mph +0.1 +0.2 +0.3 +0.2 +0.3 +0.4 +0.3 +0.2 +0.3 +0.5 +0.3   +3.0
any wind +0.1 +0.2 +0.3 +0.2 +0.3 +0.4 +0.3 +0.2 +0.3 +0.5 +0.3 +0.1 +3.3
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 22 20 24 25 26 25 26 26 26 26 24 23  290  80%

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 26 26 26 25 26 26 26 25 23 24  299  82%

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 3 3 1 2 1 1 2 2 3 5 5  32  9%
≤ 10 mph 10 8 9 7 8 7 8 8 8 9 10 10  102  28%
≤ 15 mph 16 16 17 17 18 18 18 18 17 16 16 16  204  56%
≤ 20 mph 20 20 22 24 23 24 25 24 22 21 20 20  263  72%
≤ 30 mph 27 25 28 29 30 29 30 30 28 28 26 27  337  92%
≤ 40 mph 30 27 30 30 31 30 31 31 29 30 29 30  357  98%

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

All text Copyright © Mike Cowlishaw 2008, 2020. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2020-04-03.