January has a high mean of 40 and a low mean of 22. Records show that the thermometer hit a blazing 110 degrees in 1936 and a low of -20 in 1899. A mean annual rainfall of about 40 inches makes ponds and lakes practical since only about 28 inches are lost through evaporation. The growing season averages upwards of 175 days a year. That is more than average for the area because of the turbulence of air, created by the hills, which protects against hard frost.
Tornadoes are almost non-existent in Brown County.
Only a handful has been reported since 1916. Severe thunderstorms occur possibly 10 times a year. However, the average incidence of mild thunder and lightening is about 48 times annually, most in the spring and early summer. Brown County weather is practically harmless. Conditions severe enough to cause loss of life or property are rare.