Odiham, sunrise to sunset, 1997–2017
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Met Office station 862: Odiham, Hampshire  (RG25 1); OS grid reference: SU 737494.
Coordinates:  N51°14'17" W0°56'38"  (51.238 -0.944), elevation 118 m.
Note: gusts not recorded in 5 out of the 21 years.

This is the analysis for the average of 21 years  (1997–2017).
Time slot: sunrise to sunset  (all daylight hours); click below on any-hour, or on the start time for a specific 2-hour slot (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 all daylight hours) 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 0 0 0 0 0 0 0 0 0 0  1  0%
≤ 10 mph 2 1 1 2 2 2 2 2 2 2 2 2  21  6%
≤ 15 mph 5 4 5 6 6 8 8 8 6 5 6 6  74  20%
≤ 20 mph 7 6 7 9 9 10 10 10 9 7 8 8  98  27%
≤ 30 mph 8 7 8 10 9 11 11 11 9 8 8 9  108  30%
≤ 40 mph 8 7 8 10 10 11 11 11 10 8 8 10  112  31%
any wind 8 7 8 10 10 11 11 11 10 8 9 10  112  31%
‘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 21 years) in the average number of days in each month for which (in all daylight hours) 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                          
≤ 10 mph     −0.1 +0.1 −0.1 +0.1 −0.1 −0.1         −0.1
≤ 15 mph       +0.1 +0.2 +0.1   −0.1         +0.2
≤ 20 mph −0.1     +0.3 +0.2 +0.2 +0.1 −0.1         +0.5
≤ 30 mph −0.1   +0.1 +0.3 +0.3 +0.2 +0.1 −0.1   −0.1     +0.7
≤ 40 mph −0.1 +0.1 +0.1 +0.3 +0.3 +0.2 +0.2 −0.1   −0.1   +0.1 +1.0
any wind −0.1 +0.1 +0.1 +0.3 +0.3 +0.2 +0.2     −0.1   +0.1 +1.1
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 all daylight hours) the visibility was adequate. That is, for the entire day:
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 14 12 14 16 16 16 17 17 14 14 14 16  181  49%

Bad weather analysis

This is the number of days in each month, on average, for which (in all daylight hours) no bad weather occurred. That is, for the entire day, 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 12 11 14 14 14 14 14 15 16 13 12 14  164  45%

Wind speed analysis

This is the number of days in each month, on average, for which (in all daylight hours) 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 1 1 0 0 0 0 0 0 0 1 1 1  5  1%
≤ 10 mph 6 4 4 4 4 4 4 5 6 5 6 7  59  16%
≤ 15 mph 15 14 16 15 17 17 16 18 18 17 16 16  195  53%
≤ 20 mph 21 19 22 23 23 25 25 26 25 23 23 22  277  76%
≤ 30 mph 26 25 27 28 28 28 30 30 28 28 27 27  333  91%
≤ 40 mph 29 27 30 30 30 30 31 31 30 30 29 30  356  98%

Please send any comments, questions, or corrections to me, Mike Cowlishaw, at mfc@speleotrove.com.

All text Copyright © Mike Cowlishaw 2008, 2018. All rights reserved. The pages and data here are for non-commercial use only.
This page was last edited on 2018-02-09.