oh and here is a link to the ever helpful Dolbear's Law formula on wikipedia. Makes me wonder why the snowy tree cricket (Oecanthus fultoni) is so very consistant for telling the temperature. Supposidly the average cricket is not consistant with variations in the amount they are chirping dependant on their age and mating success. Oecanthus sp. chrip a bit differently in the West as they sing a bit faster. Here is a nice Website with some sound samples and info
Its 98 degrees here. I think those snowy tree crickets would be a bit overworked.