Brize Norton, 08:00 to 10:00, 1997–2015
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Met Office station 605: Brize Norton, Oxfordshire  (OX18 3); OS grid reference: SP 292067.
Coordinates:  N51°45'29" W1°34'34"  (51.758 -1.576), elevation 81 m.
Note: gusts not recorded in 4 out of the 19 years.

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 4 4 3 4 3 4 5 5 5 5 4 4  49  13%
≤ 10 mph 9 9 9 10 11 14 15 14 12 11 10 10  134  37%
≤ 15 mph 13 13 14 17 18 20 21 20 17 15 13 14  195  53%
≤ 20 mph 14 14 15 18 19 21 22 20 18 16 13 14  202  55%
≤ 30 mph 14 14 15 19 20 21 22 21 18 16 14 15  209  57%
≤ 40 mph 14 14 16 19 20 21 22 21 18 16 14 15  210  57%
any wind 15 14 16 19 20 21 22 21 18 16 14 15  210  58%
‘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     −0.3 −0.1 −0.1   −0.1    −0.1
≤ 10 mph +0.1 −0.2 +0.1   +0.1 −0.1   +0.2 +0.1 +0.1 −0.2     
≤ 15 mph   −0.3 +0.1 +0.1 −0.1 +0.1 −0.1 +0.1 −0.1   −0.3 −0.1  −0.1
≤ 20 mph −0.1 −0.3 +0.1 +0.1 −0.1 +0.1 −0.1   −0.1   −0.3 −0.1  −0.1
≤ 30 mph −0.1 −0.3 +0.1 +0.1   +0.2 −0.1 +0.1 −0.1   −0.3 −0.1   
≤ 40 mph −0.1 −0.3 +0.2 +0.1   +0.2 −0.1 +0.1 −0.1   −0.3     
any wind −0.1 −0.3 +0.2 +0.1   +0.2 −0.1 +0.1 −0.1   −0.3     
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 21 19 19 22 24 25 26 24 21 20 19 20  259  71%

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 19 19 23 23 23 23 24 24 24 22 20 20  264  72%

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 9 8 7 6 5 6 6 7 8 8 11 9  90  25%
≤ 10 mph 19 17 18 16 16 19 21 22 21 20 20 19  229  63%
≤ 15 mph 27 25 27 26 27 28 30 30 29 28 27 27  331  91%
≤ 20 mph 29 26 29 29 29 29 30 30 29 30 28 28  346  95%
≤ 30 mph 30 28 30 30 31 30 31 31 30 31 29 30  361  99%
≤ 40 mph 31 28 31 30 31 30 31 31 30 31 30 31  365  100%

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.