Odiham, 10:00 to 12:00, 1997–2015
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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 19 years.

This is the analysis for the average of 19 years  (1997–2015).
Time slot: 10:00 to 12:00  (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 1 1 1 2 2 2 2 2 2 2 2 1  20  6%
≤ 10 mph 4 4 5 7 8 10 9 9 8 6 5 5  80  22%
≤ 15 mph 10 9 13 16 16 18 18 18 17 13 11 10  170  46%
≤ 20 mph 12 12 16 20 19 21 20 21 20 16 13 14  205  56%
≤ 30 mph 14 14 18 21 20 22 21 22 21 19 14 15  220  60%
≤ 40 mph 14 14 19 21 20 22 21 22 22 19 14 16  224  61%
any wind 14 14 19 21 20 22 21 22 22 19 15 16  224  61%
‘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 −0.2 −0.3 +0.2 −0.1 −0.1 −0.1   
≤ 15 mph       +0.2   +0.2   −0.2 +0.1 +0.1 −0.1 −0.1   
≤ 20 mph   −0.1 +0.1 +0.2   +0.2   −0.1 +0.1   −0.1 +0.1   
≤ 30 mph −0.1 −0.1 +0.1 +0.2 +0.1 +0.2       −0.1 −0.1     
≤ 40 mph   −0.1 +0.2 +0.2 +0.2 +0.2     +0.1 −0.1   +0.1   
any wind   −0.1 +0.2 +0.2 +0.2 +0.2     +0.1     +0.1  +0.1
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 19 18 22 25 26 27 27 27 25 23 19 20  278  76%

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 18 23 22 21 22 22 23 24 22 19 20  256  70%

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 3 3 3 3 2 2 2 3 2 2 3 4  33  9%
≤ 10 mph 10 9 10 9 10 11 11 11 11 10 11 12  123  34%
≤ 15 mph 20 19 21 21 22 23 24 24 23 22 21 19  259  71%
≤ 20 mph 25 23 26 27 27 28 29 30 28 26 26 26  321  88%
≤ 30 mph 29 27 29 30 30 30 31 31 30 30 28 29  353  97%
≤ 40 mph 30 28 31 30 31 30 31 31 30 31 29 30  362  99%

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.