On 13 Nov 07, at 15:24, Judy Glattstein wrote: > ..."Bliss Formula" to wit: "At 1/2 hour after sunset, note air > temperature (a) and dew point temperature (b). Add these temperatures > and multiply the sum by .31 to get the lowest temperature likely (c). (a > + b) x .31 = c" Those would Fahrenheit temperatures, presumably. -- Rodger Whitlock Victoria, British Columbia, Canada Maritime Zone 8, a cool Mediterranean climate on beautiful Vancouver Island