Pembrey Sands, 06:00 to 08:00, 1997–2017
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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 21 years, 2.6% of daylight visibility records missing, 2.5% of daylight precipitation records missing, 2.3% of daylight wind records missing, no weather reports recorded.

This is the analysis for the average of 21 years  (1997–2017).
Time slot: 06:00 to 08:00  (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 2 3 5 5 6 5 4 1 0 0  31  8%
≤ 10 mph 0 0 5 10 11 11 12 12 11 3 0 0  76  21%
≤ 15 mph 0 0 8 16 17 17 18 17 15 4 0 0  111  31%
≤ 20 mph 0 0 9 18 19 20 22 20 18 5 0 0  130  36%
≤ 30 mph 0 0 10 21 23 22 25 23 22 6 0 0  151  41%
≤ 40 mph 0 0 10 21 24 22 25 23 22 6 0 0  153  42%
any wind 0 0 10 21 24 22 25 23 22 6 0 0  154  42%
‘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 21 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 −0.2 −0.1         −0.4
≤ 10 mph     −0.1     +0.1 −0.2   +0.1       −0.1
≤ 15 mph       +0.2   +0.2 −0.1     +0.1     +0.4
≤ 20 mph       +0.3 +0.2 +0.1 −0.1     +0.1     +0.6
≤ 30 mph     +0.1 +0.2 +0.1 +0.1 −0.1 +0.2 +0.1 +0.1     +0.9
≤ 40 mph     +0.1 +0.2 +0.1 +0.1   +0.2 +0.1 +0.1     +1.0
any wind     +0.1 +0.2 +0.1 +0.1   +0.2 +0.1 +0.1     +1.0
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 0 0 11 24 26 24 27 25 24 7 0 0  169  46%

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 25 23 26 25 27 26 28 27 27 25 24 25  308  84%

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 4 4 6 6 7 7 7 7 6 4 5 4  67  18%
≤ 10 mph 11 11 14 15 15 14 14 15 15 12 12 11  158  43%
≤ 15 mph 17 17 21 23 21 21 21 21 21 18 17 17  234  64%
≤ 20 mph 21 21 25 26 24 25 26 25 24 22 20 21  279  76%
≤ 30 mph 28 26 29 29 30 29 30 30 29 28 27 27  342  94%
≤ 40 mph 30 27 30 30 31 30 31 31 30 30 29 30  359  98%

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

All text Copyright © Mike Cowlishaw 2008, 2018. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2018-02-09.