Brize Norton, 08:00 to 10:00, 1997–2020
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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 24 years.

This is the analysis for the average of 24 years  (1997–2020).
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 4 4 5 5 5 4 4 4 ​ 50  14%
≤ 10 mph 10 9 9 11 12 14 16 15 13 11 9 10 ​ 138  38%
≤ 15 mph 13 13 14 17 19 20 22 20 17 15 13 14 ​ 196  54%
≤ 20 mph 14 14 15 19 20 20 22 20 18 16 13 14 ​ 204  56%
≤ 30 mph 14 14 16 19 21 21 23 21 18 16 13 15 ​ 210  58%
≤ 40 mph 15 14 16 19 21 21 23 21 18 16 13 15 ​ 212  58%
any wind 15 14 16 19 21 21 23 21 18 16 13 15 ​ 212  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 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       +0.1   −0.2 −0.1     −0.1   ​−0.2
≤ 10 mph +0.2 −0.1 +0.1 +0.1 +0.3 −0.1 +0.1 +0.2 +0.1 +0.1 −0.1   ​+0.8
≤ 15 mph   −0.1   +0.2 +0.1 −0.1       +0.1 −0.2 −0.1 ​−0.1
≤ 20 mph   −0.2 +0.1 +0.2 +0.2           −0.2 −0.1 ​−0.1
≤ 30 mph   −0.2 +0.1 +0.2 +0.2 +0.1   +0.1     −0.2 −0.1 ​+0.1
≤ 40 mph   −0.2 +0.1 +0.2 +0.2 +0.1   +0.1 +0.1   −0.2 −0.1 ​+0.3
any wind   −0.2 +0.1 +0.2 +0.2 +0.1   +0.1 +0.1   −0.2 −0.1 ​+0.3
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 21 19 19 22 24 25 26 24 22 21 18 20 ​ 261  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 24 23 25 24 24 22 20 20 ​ 265  73%

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 10 8 7 6 5 6 6 7 8 8 11 9 ​ 91  25%
≤ 10 mph 20 17 18 16 17 19 21 22 21 21 20 20 ​ 232  64%
≤ 15 mph 27 25 26 26 27 28 30 30 28 29 28 27 ​ 331  91%
≤ 20 mph 29 26 28 29 29 29 30 30 29 30 28 28 ​ 345  94%
≤ 30 mph 30 27 30 30 31 30 31 31 30 31 29 30 ​ 360  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, 2021. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2021-05-09.