Odiham, any hour 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  (any daylight hour); click below on the start time for a specific 2-hour slot, or on all-day 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 some daylight hour) 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 Hours
≤ 5 mph 5 5 8 12 14 14 15 14 11 8 6 6  119  32%  448  9%
≤ 10 mph 13 14 19 22 23 24 25 25 23 18 16 13  237  65%  1413  29%
≤ 15 mph 21 21 26 27 29 29 30 30 28 26 23 21  312  85%  2533  52%
≤ 20 mph 24 24 28 28 30 29 31 30 29 28 25 23  329  90%  2909  60%
≤ 30 mph 25 25 29 29 30 29 31 30 29 29 26 25  337  92%  3053  63%
≤ 40 mph 25 25 29 29 30 29 31 30 29 29 26 25  338  93%  3081  63%
any wind 26 25 29 29 30 29 31 30 29 29 26 25  339  93%  3089  64%
‘Total’ shows the total flyable days, on average, in a year, and the same as a percentage.
‘Hours’ shows the total flyable hours, on average, in a year, and the same as a percentage of total daylight hours.

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 some daylight hour) 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 −0.1 −0.3 +0.2 +0.1 +0.1   +0.1
≤ 10 mph     +0.1 +0.4     −0.1 −0.2 +0.2 +0.2     +0.6
≤ 15 mph       +0.2       −0.1 +0.1 +0.1   +0.1 +0.5
≤ 20 mph     +0.1 +0.1       −0.1 +0.1     +0.2 +0.4
≤ 30 mph   −0.1   +0.1       −0.1 +0.1     +0.1 +0.1
≤ 40 mph   −0.1   +0.1       −0.1 +0.1     +0.2 +0.1
any wind   −0.1   +0.1       −0.1 +0.1     +0.2 +0.2
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 some daylight hour) the visibility was adequate. That is, for the entire hour:
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
Good days 28 26 30 30 31 30 31 31 30 30 28 27  350  96%

Bad weather analysis

This is the number of days in each month, on average, for which (in some daylight hour) no bad weather occurred. That is, for the entire hour, 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 28 27 30 29 30 30 31 31 30 30 28 28  352  96%

Wind speed analysis

This is the number of days in each month, on average, for which (in some daylight hour) 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 5 5 8 12 14 14 15 14 11 8 6 6  119  32%
≤ 10 mph 13 14 19 22 23 24 25 25 23 18 16 13  237  65%
≤ 15 mph 21 21 26 27 29 29 30 30 28 26 23 21  312  85%
≤ 20 mph 24 24 28 28 30 29 31 30 29 28 25 23  329  90%
≤ 30 mph 25 25 29 29 30 29 31 30 29 29 26 25  337  92%
≤ 40 mph 25 25 29 29 30 29 31 30 29 29 26 25  338  93%

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.