On another forum, someone asked about weather data during the war. Here is what I posted for an answer:
There are several sites that offer this kind of historical weather data. Here is one example:
http://weather-warehouse.com/?gclid=CN3k2N...CFQGPWAodq32nsA
This is not a FREE service, but they seems quite reasonable.
Here's a comprehensive page from the NCDC
http://www.ncdc.noaa.gov/oa/climate/climatedata.html
This page on their site deals specifically with WWII era data
http://www.ncdc.noaa.gov/oa/climate/online...ww-ii-data.html
Also you can glean info from National Archive files. When I received all the S-1 thru S-4 reports, etc. from NARA in College Park, Maryland for my dad's unit, they have many references to weather conditions such as temperature.
Hope that helps ya!