Table 3. Example of climate fluctuations for Bloomington, IN and species' ranges.

	Annual Mean Temp	Min Temp of Coldest Month	Max Temp of Warmest Month	Temp Seasonality
Bloomington, IN
Present	11.5	−7.3	29.9	950
LGM	−8.5	−29.1	11.6	910
120 kya	9.7	−22.8	38.4	1408
Species' Ranges
C. horridus	2.5 – 21.5	−17.9 – 6.9	21.0 – 35.9	562 – 1212
C. viridis	−3.8 – 22.1	−22.6 – 5.6	15.7 – 38.0	543 – 1245
C. scutulatus	5.9 – 24.2	−9.6 – 14.7	14.9 – 43.2	106 – 949
C. enyo	15.2 – 23.9	3.4 – 12.3	25.8 – 37.1	336 – 502
C. molossus	5.9 – 28.2	−11.0 – 16.5	14.9 – 41.4	106 – 864
C. basiliscus	15.0 – 28.8	3.1 – 17.7	24.6 – 39.9	141 – 512
C. mitchellii	7.5 – 24.3	−6.7 – 12.3	25.4 – 42.2	336 – 913
C. tigris	15.0 – 25.7	−1.7 – 11.3	31.7 – 41.2	512 – 827
C. adamanteus	15.9 – 23.8	−0.8 – 13.7	31.5 – 33.8	332 – 776
C. atrox	6.7 – 27.6	−10.6 – 19.6	23.3 – 42.2	145 – 974
C. ruber	10.1 – 23.9	−3.6 – 12.3	25.8 – 38.9	336 – 740

Example of the variance of 4 bioclimatic variables for one 50 km point in the Midwest, Global ID #139912, (Bloomington, IN) and the range of these variables in the modern climate envelopes for 11 rattlesnake species.