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Observations by Gary Fewless for Green Bay WI (Lat.N 44.51° Long. W 88.02° ), except as noted. For flowers lacking conspicuous petals or sepals I define "anthesis" as release of pollen by mature anthers.

December 2010 Mouse-over the photo for the identity of the subject
ice on limestone

Green Bay year summary 2010

Based on data of the National Weather Service office in Green Bay, the year 2010 was the 2nd wettest year on record (record period is 1886-2010). The total of 38.15 inches was less than 1/4 inch below the record precipitation in 1985 (38.36). The total precipitation during summer months of June, July and August combined was a record for that period. It was also the 7th warmest year on record for Green Bay. The highest temperature in Green Bay in 2010 was 91° F on August 12 and the lowest was -13° Dec. 15. In case you are wondering, the highest temperature ever recorded in Green Bay was 104° (July 13, 1936) and the coldest ever was -36° (Jan. 21, 1888).

The last spring freeze this year was May 5 (we did have an inch of snow on May 7/8 though) and the first autumn freeze was Oct 3, the freeze free period therefore was 151 days and that was about the same as the frost-free period.

Dec 31

Unusually warm temperatures resulted in severe thunderstorms and an estimated 40 tornados in Arkansas, Missouri and Illinois today.

In Wisconsin, 23 of 31 days in December did not rise above freezing. The highest temperature was 43° F and the lowest was -13° F. The month ranks 1.1 degree F colder than "normal". There was a total of 22.2 inches of snow for the month (1.91 inches as water equivalent). The local Green Bay National Weather Service station reported 6 inches of snow on the ground at the end of the month, with a peak on the ground depth of 14 inches on Dec 22.

Dec 29

The snow in our area is enjoyed by a variety of users, as here on one of UW-Green Bay's Cofrin Arboretum trails. Many people who live here look forward to the snow season.

Although it doesn't seem particularly cold, Green Bay has been below freezing continuously since Dec. 11, except for one high of 33° F on the 21st. Indeed the highest temperautre this month has been 33, on 4 dates (Dec. 4, 10, 11 and 21).

Dec 27 Yesterday and today a big snow storm struck the northeastern U.S., shutting down airports, trains and subways and blocking up roads. At least one location in New Jersey reported 32 inches of snow and numerous others reported 20 or more inches of snow, including parts of New York City. Numerous people were stranded in airports, etc for a couple of days as thousands of flights were cancelled.
Dec 22 After yesterday's snow which continued into the early morning, the sky is now clear and bright with heavt frost on trees, etc.
Dec 21

Snow began in Green Bay yesterday evening and continued lightly through this morning, delivering 6.9 inches in Green Bay (6.2 inches on this date, plus 0.7 inches last night before midnight). Rhinelander (100 miles NW) reported 8.3 inches; Milwaukee 100 miles south and on the Lake Michigan shore reported 1.3 inches.

Today is the Winter Solstice, the shortest day (light) period of the year. Sunrise was at 7:25 a.m. and sunset at 4:15 p.m. for a light period of 8 hrs, 49 minutes and 30 seconds. The light period will begin to increase after today, though it changes very slowly at this point, increasing by only one second tomorrow, and a total of only 2 minutes and 26 seconds by the end of December. Just for idle comparison on this shortest of winter days, the longest day of the year is usually about June 21st, when the light period is 15 hours 33 minutes and 17 seconds. Keep in mind that the numbers are different at different locations on the earth and they even vary at the same location in different years.

Dec 20

Snow in Green Bay, beginning in the evening and continuing into the following morning. Here's a morning photo before the clouds and snow arrived.

Dec 17 The morning low temperature was +12° F-- a welcome and easily recognized improvement over the previous 3 mornings.
Dec 16 Green Bay's morning low temperature was -10° F. For the previous 3 days and today so far the winds have been remarkably light.
Dec 15

Green Bay's morning low temperature was -13° F and we've been below zero since about 10:00 p.m. last night. High temperature was +14° F-- both the lowest low and lowest high temperatures of the season. Rhinelander (about 100 miles NW of Green Bay) reported a low temperature of -20° F.

The sky is cloudless and perfectly clear this morning except for some very fine frost particles floating in the air in early morning (not visible unless backlit by the sun--very fine grain). I see that the airport weather station listed the air-born frost as "mist", a technicality I guess.

Dec 14

The low temperature in Green Bay was -7° F (morning low was +1, but temps fell rapidly in the evening) , our lowest of the year so far.

Drifted snow on UW-Green Bay's Cofrin Arboretum path
Snow banks in Lab Science parking Lot
Green Bay from UW-GB shoreline

Dec 13

A great night for viewing meteors. The air was very clear and the Geminid meteor shower delivered right on schedule. The peak was later, but our evening walk away from the lights at about 8:30 p.m. produced some nice views. There should still be some good viewing on the 14th. Highly recommended, (and no commercials ;>)

A morning low temperature of 3° F in Green Bay and a high temperature of only 15 makes this our coldest day of the winter to date.

Dec 12 The snowstorm continues, adding 4.5 inches of snow after midnight, for a two-day storm total of 11 inches of snow in Green Bay. Average winds of 27.3 MPH (mostly from the north) and peak of 53 continue drifting the snow and making driving difficult. Temperatures began to fall in the afternoon and reached a low of about 4° F by the next morning (Dec 13). Snowcover at the weather station is reported at 10 inches.
Dec 11

A major snowstorm hits Wisconsin dropping 6.5 inches of snow on Green Bay before midnight, and continuing into the next day. Strong winds averaging 21.8 MPH with peak of 47 cause severe blowing and drifting of snow.

A record of 12.8 inches of snow for this date was reported at Wausau, Wisconsin.

Dec 9

Green Bay received 1.9 inches of snow, our first significant snow of the season. More snow is predicted tonight and tomorrow. The snow depth at the airport is reported at 2 inches, the first official snowcover of the season.

Last year (2009) a snow storm began on this date and continued through the 10th, bringing a total of 14.6 inches of snow to the National Weather Service station in Green Bay, and over 16 inches to some nearby areas (my driveway for example).

Dec 7

Green Bay's low temperature of 12° F is the lowest of the season to date.

With the exception of a brief high temperature of 33° F on Dec 4, Green Bay has not been above freezing since November 30. Daily high temperatures have been in the 24-27° range and lows in the teens.

There has been a trace of snow each day this month and more on the first, but mostly the ground is brown.

Dec 6

Ice on Green Bay from UW-Green Bay's Cofrin Arboretum. Within the obvious ice-covered area, even the portions that appear to be open water are just ice of different compositions, smooth, rippled, etc.

Green Bay's low temperature of 15° F is the lowest of the winter so far.

Dec 3 The preliminary count of deer harvest in Wisconsin's 9 day gun deer season for 2010 was reported as 218,144, about an 11 % increase from last year.
Dec 1

A morning low temperature of about 23° F and enough light snow (0.6 inches) to whiten bare ground and mowed lawns. Still snowing at noon.

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Last updated on May 20, 2015