|Rainfall for the conterminous US in July 1993. Note the heavy rainfall in Kansas, Nebraska, Iowa and Missouri near the boundary between much-hotter and much-cooler than normal conditions.|
|Conterminous US temperature anomalies for May 1907. Note the extreme cool in the Upper Midwest, where many places averaged below freezing overnight.|
Although it’s often the case that temperature anomalies in the contiguous US do not reflect global trends (e.g. March 1946) the summer of 1907 seems not to follow such a pattern, being cool to very cool almost everywhere with reliable data. May 1907’s extreme cool (if the base period on the top map is manifestly outside the virgin period and unnecessarily influenced by Australian car and coal pollution) can be seen to extend well into the Arctic Circle.
The extremely cool summer in the US and Britain is hardly counterbalanced at all – like we would expect it to be in the maps for the 1906/1907 winter, the summer of 1816, and July 1993. It is true that there is a hotter-than-normal area just west of the Urals, but unlike many more famous months of simultaneous unusually cool weather in the US and Europe, there is no markedly hotter-than-average weather over the Labrador or Bering Seas. This suggests 1907 really was a “year without a summer” on quite a wide scale, though global temperature data do not show this as far as I am aware – the winter of 1906/1907 was extremely cold in southeastern Europe, Canada and Greenland, but very mild in Scandinavia and northwestern Russia.
It’s interesting to see that this “year without a summer” saw googly bowlers – expected to be at their best in a hot and dry summer – do so well. It’s almost as if the extreme cool weather did not make pitches softer as would be expected, especially as if it was windy they might have dried out well as is indicate by the high proportion of finished matches for a summer with only 53 dry days out of 123.
It may also have helped Arthur Fielder gain his surprising return of 172 wickets in an era when fast bowlers tended to be valueless in wet weather – if this very cool summer and improved drainage made getting a foothold easier, it makes sense Fielder could against weaker batsmen do so well.