Present-Day Environments and Climate Change - Mountains and Plains: The Ecology of Wyoming Landscapes - page 39

2012
45.6°F

Mean Annual
Temperature

Average
41.7°F

1895
40.9°F

Mean March
Temperature

2012
40.2°F
Average
30.1°F

1895
27.8°F

November - March
Precipitation

1895
0.97 in / m

Average
0.72 in/ m

2012
0.65 in / m

1895 1905 1915 1925 1935 1945 1955 1965 1975 1985 1995 2005

Year

Fig. 3.9. Summary of historic climate data for Wyoming. the
trends suggest that, during the past two or three decades, the
frequency of unusually warm years and warm March temper-
atures has increased and the amount of winter precipitation
per month has generally declined. the shaded area indicates
±1 standard deviation of the averages for 1895-2012. the

data come from thirty long-time weather stations distrib-
uted throughout the state, all with records starting in 1895,
and were obtained from the national oceanographic and
Atmospheric Administration (http://www.ncdc.noaa.gov/
cag/). Adapted from Shuman (2012); supplemented with
recent data.