Pembrey Sands, 08:00 to 10:00, 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 6 out of the 19 years, 2.3% of daylight visibility records missing, 2.9% of daylight precipitation records missing, 2.2% of daylight wind records missing.

This is the analysis for the average of 19 years  (1997–2015).
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 3 4 4 4 3 3 2  36  10%
≤ 10 mph 7 6 9 9 8 9 10 9 10 8 7 7  99  27%
≤ 15 mph 11 10 14 16 15 16 16 16 16 12 12 11  163  45%
≤ 20 mph 13 12 16 18 18 19 19 19 18 15 13 14  195  53%
≤ 30 mph 17 15 19 21 22 21 22 21 21 19 17 18  234  64%
≤ 40 mph 17 16 19 22 23 22 22 22 22 21 18 19  241  66%
any wind 18 16 19 22 23 22 22 22 22 21 19 19  244  67%
‘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       −0.2 −0.1 +0.1 −0.1 −0.1 +0.1   
≤ 10 mph −0.1 +0.1 −0.1 +0.1 −0.1 +0.1   −0.2 +0.2   +0.1 −0.1   
≤ 15 mph −0.1 +0.3   +0.4 −0.1 +0.2 +0.1 −0.1 +0.3 +0.2   −0.1  +0.1
≤ 20 mph −0.1 +0.2 +0.1 +0.3 +0.1 +0.3     +0.4 +0.3   −0.2  +0.1
≤ 30 mph +0.1 +0.2 +0.1 +0.3 +0.1 +0.3 +0.2 +0.1 +0.4 +0.3 +0.1 −0.1  +0.2
≤ 40 mph +0.1 +0.2 +0.1 +0.3 +0.3 +0.3 +0.2 +0.1 +0.4 +0.3 +0.1    +0.2
any wind +0.2 +0.2 +0.1 +0.3 +0.3 +0.3 +0.2 +0.2 +0.4 +0.3 +0.2    +0.2
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 20 19 21 24 25 24 24 24 24 24 22 22  273  75%

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 22 27 26 26 25 26 26 25 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 4 4 6 4 4 4 5 5 6 5 5 5  57  15%
≤ 10 mph 11 11 13 12 11 11 12 12 13 11 11 12  140  38%
≤ 15 mph 17 17 21 20 19 20 20 21 20 17 17 17  227  62%
≤ 20 mph 21 20 25 24 23 25 25 25 24 22 20 21  274  75%
≤ 30 mph 28 25 29 29 29 29 30 30 29 28 27 27  340  93%
≤ 40 mph 30 28 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, 2017. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2017-01-01.