Record Keeping Quirk

.CLIMATE...TUCSON INTERNATIONAL AIRPORT RECORDED ITS SEVENTH
STRAIGHT MORNING OF SUB-FREEZING TEMPERATURES WITH A LOW OF 31
DEGREES. THIS IS THE LONGEST STREAK SINCE 2000 WHEN THE AIRPORT
RECORDED 32 DEGREES OR COLDER FROM JANUARY 3RD TO JANUARY 9TH. IN
CASE YOU WANTED TO KNOW THE ALL-TIME RECORD...IT IS 17 DAYS WHICH
OCCURRED 3 TIMES (1912/1904/1898).
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The above is from the NWS FD this afternoon (5 January 2011), indicating 7 straight mornings at TUS with lows of 32F or colder. This is interesting since I checked my logs and show 6 straight mornings with lows below freezing. The difference is due to the fact that I read the morning minimum a bit after sunrise each day and have no continuous trace of the temperature with time. On the morning of 30 December the low here was in the 40s. The temperature then fell some during the morning rains into the upper 30s - thus, morning low on 30 December was not below freezing. Looking at the TUS records I see that the low temperature on December 30th occurred just before midnight that night (i.e., not a morning low but a low for the day), accounting for the difference in our statistics.
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For the last 6 mornings the average low at TUS has been 27F and the average low here at the house has been 20F. Needless to say, it has been quite frosty here along the Rillito.