Aldergrove, 06:00 to 08:00, 1997–2020
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Met Office station 1450: Aldergrove, County Antrim  (BT29 4); IRL grid reference: 314562E 380950N.
Coordinates:  N54°39'50" W6°13'26"  (54.664 -6.224), elevation 63 m.
Note: gusts not recorded in 5 out of the 24 years, 0.6% of daylight visibility records missing, 0.3% of daylight wind records missing.

This is the analysis for the average of 24 years  (1997–2020).
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 5 5 5 6 6 4 0 0 0 ​ 33  9%
≤ 10 mph 0 0 5 11 13 13 14 13 11 1 0 0 ​ 82  23%
≤ 15 mph 0 0 7 16 19 18 19 17 16 2 0 0 ​ 113  31%
≤ 20 mph 0 0 7 17 19 18 19 18 17 2 0 0 ​ 118  32%
≤ 30 mph 0 0 7 17 20 19 19 18 17 2 0 0 ​ 119  33%
≤ 40 mph 0 0 7 17 20 19 19 18 17 2 0 0 ​ 120  33%
any wind 0 0 7 17 20 19 19 18 17 2 0 0 ​ 120  33%
‘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   +0.2 +0.1   +0.1       ​+0.4
≤ 10 mph       +0.2 +0.1 +0.3 +0.4 +0.1 +0.3       ​+1.4
≤ 15 mph     +0.1 +0.3 +0.2 +0.2 +0.3 +0.2 +0.3       ​+1.7
≤ 20 mph     +0.1 +0.3 +0.3 +0.2 +0.3 +0.2 +0.3       ​+1.7
≤ 30 mph     +0.1 +0.3 +0.3 +0.2 +0.3 +0.2 +0.4       ​+1.8
≤ 40 mph     +0.1 +0.3 +0.3 +0.2 +0.3 +0.2 +0.4       ​+1.9
any wind     +0.1 +0.4 +0.3 +0.2 +0.3 +0.2 +0.4       ​+1.9
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 25 27 26 26 25 24 3 0 0 ​ 166  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 17 15 19 20 22 20 21 20 21 20 17 17 ​ 229  63%

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 6 5 6 8 7 7 8 9 7 7 6 5 ​ 82  22%
≤ 10 mph 14 13 16 18 18 20 21 21 19 16 16 14 ​ 205  56%
≤ 15 mph 23 22 25 27 28 28 29 29 27 26 25 24 ​ 313  86%
≤ 20 mph 27 25 29 29 30 29 31 30 29 29 28 28 ​ 343  94%
≤ 30 mph 30 27 30 30 31 30 31 31 30 30 29 30 ​ 358  98%
≤ 40 mph 30 28 31 30 31 30 31 31 30 31 30 31 ​ 364  100%
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.