Forecast the weather
Ruby 1.8, 95 characters

#!ruby -nrdate
7.times{|i|puts (Date.parse($_)+i).strftime"%A #{"\023\004\016\016\035"[$_[-3]%5]-9+rand(21)}"}


The character escapes inside the string should be replaced by the character literals they represent.


Found a shorter way to pack the data, Ruby 1.9 would be 4 characters longer now (add .ord after $_[-3]).
112 -> 105 by stealing Joey's idea of not splitting the input.
105 -> 101. Note that the first line is actually parsed by the Ruby interpreter itself, so it even works when running the solution like echo "Thursday Winter" | ruby1.8 forecast.rb
101 -> 96. Stole Joey's idea again to just embed the temperatures into a string instead of an array.
Whoops, just noticed it should be rand(21), not rand(20).
96 -> 95. Removed unnecessary whitespace.