Daily weather data collected from cooperative weather stations across Wisconsin between 1950 and 2006 show that, statewide, the annual average temperature has risen by 1.1 °F since 1950—consistent with global trends. Average temperatures have risen fastest in winter and spring, while summer and fall have actually cooled a bit. There are geographic differences as well; winters in northwestern Wisconsin have warmed most, by as much as 4.5 °F.
