Weather in 1861 - see
Gives reports for various years.
http://weather.unisys.com/hurricane/atlantic/

Dress of individuals in the period and indication of the impact of the weather.
http://www.rust.net/~gwjchris/WEATHER.HTM

A mention of the weather
http://www.qmfound.com/feeding_billy_yank.htm

Peel diary
http://www.mindspring.com/~4jdurham/peel/lastroll.html
email jdurham@iname.com ask for diary sept 1963 it mentions a good bit about the weather. other months my also.

Weather in VA in 1861
http://www.thejucketts.com/civilwar/november91861.htm

Johns Diary
1861-65 with weather statements
http://homepages.rootsweb.com/~schmblss/home/JohnsJournal/1860-1865.html

LOC Weather in 1864
http://memory.loc.gov/ammem/today/dec16.html

KY
http://www.civilwarhome.com/darkandbloodyground.htm

Niles Diary
http://docsouth.unc.edu/niles/niles.html

Lucy Webb Hayes - mentions weather almost every day
http://www.rbhayes.org/mssfind/cw1861_lwh.htm

I hope helps you.