@gollum,
gollum wrote:
Is it harmful to human health to go out in the cold (e.g., 20 degrees F.) for a few minutes?
Let's see... 20F equals -6C which is nothing where I am right now and even more nothing north of me. It's easily -20C which is -4F, and -30C (or colder) with the wind chill which is -22F . So, the answer is NO. Or none of us would be alive up here (Canada).
NUNAVUT
"The arctic climate is also noted for its long, cold winter, when temperatures of -40°C (-40°F) or colder occur. The coldest temperature ever recorded at Alert, Canada’s northernmost center in the Arctic, is -50°C (-58°F). "
TORONTO
In general, mild periods do occur in most winters, with temperatures reaching in the 5-10 °C range (40-50°F) and sometimes higher. There are usually extended snow free periods even in mid-winter, particularly in the city core and areas adjacent to the lakeshore. The average January maximum is -1 °C (30 °F). There are usually a few bitter cold snaps where temperatures go from the average low near -10 °C to lows in the -20°C range (especially in the northern suburbs), with windchill making it feel colder than -30 °C. The coldest temperature recorded at Toronto Pearson International Airport was -31.3 °C(-24.3 °F) on January 4, 1981, and the coldest windchill recorded was -44.7 °C (-48.5 °F) on the same day.
CALGARY
Calgary is a city of extremes, and temperatures have ranged anywhere from a record low of ??'45 °C (??'49.0 °F) in 1893 to a record high of 36 °C (97 °F) in 1919. Temperatures fall below ??'30 °C (??'22.0 °F) on about five days per year, though extreme cold spells usually do not last very long. According to Environment Canada, the average temperature in Calgary ranges from a January daily average of ??'10 °C (14.0 °F) to a July daily average of 17 °C (63 °F)
Just to give you an idea.