Brize Norton, 06:00 to 08:00, 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 5 out of the 19 years.

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 3 7 5 7 8 10 8 3 0 0  51  14%
≤ 10 mph 0 0 8 13 12 15 16 17 14 6 0 0  101  28%
≤ 15 mph 0 0 9 16 15 19 19 18 15 7 0 0  119  33%
≤ 20 mph 0 0 9 17 16 19 19 18 15 8 0 0  121  33%
≤ 30 mph 0 0 10 17 16 19 19 18 15 8 0 0  122  34%
≤ 40 mph 0 0 10 17 16 20 19 18 15 8 0 0  123  34%
any wind 0 0 10 17 16 20 19 18 15 8 0 0  123  34%
‘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   −0.1       
≤ 10 mph         +0.1 −0.1 +0.1 +0.1 −0.1 −0.2       
≤ 15 mph       +0.1   +0.1 +0.1 +0.2   −0.2       
≤ 20 mph       +0.1   +0.1 +0.1 +0.1   −0.2       
≤ 30 mph       +0.1 +0.1 +0.1 +0.1 +0.1   −0.2       
≤ 40 mph     +0.1 +0.1 +0.1 +0.1 +0.1 +0.1   −0.2       
any wind     +0.1 +0.1 +0.1 +0.1 +0.1 +0.1   −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 12 20 21 22 21 21 18 10 0 0  146  40%

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 20 19 24 24 23 23 24 25 24 21 20 20  265  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 8 9 10 11 9 10 11 15 15 12 11 9  131  36%
≤ 10 mph 20 17 23 22 22 23 26 28 26 23 22 20  272  74%
≤ 15 mph 27 25 28 28 29 29 31 31 29 30 28 27  343  94%
≤ 20 mph 29 27 29 29 30 29 31 31 30 30 29 29  353  97%
≤ 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.