Kirkwall, 06:00 to 08:00, 1997–2015
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Met Office station 23: Kirkwall, Orkney  (KW17 2); OS grid reference: SY 482077.
Coordinates:  N58°57'14" W2°54'00"  (58.954 -2.900), elevation 26 m.
Note: gusts not recorded in 6 out of the 19 years, 2.1% of daylight visibility records missing, 17.8% of daylight precipitation records missing, 1.8% of daylight wind records missing.

This is the analysis for the average of 19 years  (1997–2015).
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 1 1 2 2 1 2 1 0 0 0  10  3%
≤ 10 mph 0 0 2 4 5 5 5 7 5 1 0 0  35  10%
≤ 15 mph 0 0 5 9 10 12 11 12 10 2 0 0  72  20%
≤ 20 mph 0 0 7 11 13 14 14 15 12 3 0 0  89  24%
≤ 30 mph 0 0 8 13 15 16 14 16 14 4 0 0  99  27%
≤ 40 mph 0 0 8 13 15 16 14 16 14 4 0 0  100  27%
any wind 0 0 8 13 15 16 14 16 14 4 0 0  100  27%
‘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     +0.1 +0.2 +0.2 +0.2 +0.3 +0.2 +0.1        +0.1
≤ 15 mph     +0.1 +0.2 +0.2 +0.5 +0.7 +0.4 +0.2        +0.2
≤ 20 mph     +0.1 +0.2 +0.1 +0.5 +0.8 +0.4 +0.2        +0.2
≤ 30 mph       +0.3 +0.1 +0.5 +0.8 +0.4 +0.2        +0.2
≤ 40 mph     +0.1 +0.2 +0.1 +0.5 +0.8 +0.4 +0.2        +0.2
any wind     +0.1 +0.3 +0.1 +0.5 +0.8 +0.4 +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 0 0 15 23 25 24 22 24 23 7 0 0  163  45%

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 15 14 16 17 18 17 18 18 17 15 13 14  190  52%

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 2 1 2 3 4 2 3 4 3 2 1 3  30  8%
≤ 10 mph 6 4 6 8 9 9 11 12 9 6 5 7  92  25%
≤ 15 mph 14 10 15 17 19 19 22 23 18 16 13 14  200  55%
≤ 20 mph 20 16 21 22 26 26 28 27 24 22 19 19  270  74%
≤ 30 mph 26 25 28 29 30 30 31 31 29 29 27 27  340  93%
≤ 40 mph 29 27 30 30 31 30 31 31 30 30 29 29  356  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.