The Augusts of the 1920s v the Augusts of the 1930s

[Weather-history]

The Augusts of the 1920s were generally poor months and at times particularly cool, whilst the Augusts of the 1930s tended to be warmer with notable heatwaves

1920s decadal August average: 15.0

1930s decadal August average: 16.3

Number of days with a daily CET mean of 20.0C+

1920s: 1

1930s: 17

There was only one August in the 1920s that breeched the 16.0 CET mark: (1926: 16.2)

There were 7 August in the 1930s that breeched the 16.0 CET mark and 2 that breeched the 17.0 CET mark (1932: 17.1; 1933: 17.6)

The Augusts of the 1930s tended to be drier as well

1920s August rainfall average: 89.9mm

1930s August rainfall average: 65.9mm

There were no sub 50mm Augusts in the 1920s, there were 4 in the 1930s.

Edited August 10, 2007 by Mr_Data

[kold weather]

I wonder why it would change upwards like that??

The only explanation I can sort of think of is the AMO flipped to its positive phase which would have meant much more in the way of hurricanes pumping up more heat and helping to pump the Azores high more...then again it is probably just one of those strange features you see every now and then, like the July's of the last 10 years you mentioned a little while ago.

(Intrestingly 1932-33 was the 2 year period when it flipped and both years saw above average tropical activity in terms of the ACE which is the best measure of such activity in the tropics, both recorded wel above normal...indeed 1933 was hyperactive, second most active ever.)

Edited August 10, 2007 by kold weather