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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.

May 2010northern pin oak leaves opening

Mouse-over the photo for the identity of the subject

May 31

Rosa blanda (wild rose) and Tradescantia ohioensis (spiderwort) in flower.

Green Bay's monthly average temperature was about 2.4 degrees above the long term average for May. Precipitation was 1.99 inches, about 0.76 inches below average. Temperatures for May 2010 ranged from a low of 31° F on May 9th to a high of 90° F on May 24. We even had 1 inch of snow on May 7/8.

May 27

Baptisia alba (white wild indigo), Dactylis glomerata (orchard grass), Hieracium aurantiacum (orange hawkweed), Tragopogon pratensis (yellow goat's-beard) in flower.

Fox Snakes (Elaphe vulpina) mating, Oconto County, Town of Little Suamico (Tom Erdman).

May 26

Populus deltoides (eastern cottonwood) beginning to release mature "cotton" seeds, City of Green Bay.

Ranunculus acris (tall buttercup), Robinia pseudoacacia (black locust), Anemone canadensis (Canada anemone) in flower.

Saw my first Black Swallowtail butterfly this season floating through the garden.  Too bad the only parsley I have is in the front yard and not to be there long.  However,  I do have dill weed growing in the garden already so maybe that will be an egg site, Green Bay WI (Dave Parsons).

May 25 Rosa rugosa (rugosa rose), Leucanthemum vulgare (ox-eye daisy) and Symphytum officinalis (comfrey) all in flower now around City of Green Bay.
May 24

You may want to check back a few days (to May 18)-- I've added in some sightings that I hadn't had time to enter at the appropriate time.

Poa pratensis (Kentucky bluegrass) begins general flowering in our area.

Another very hot day with Green Bay reaching at least 90° F (the day isn't over yet) at the NWS weather station. I believe that is a new daily high temperature record in Green Bay. The dew point is 70° ±, making it uncomfortably humid too. Average highs are about 72° F for this date.

At 1:30 today the remote thermometer on the north side of my garden shed recorded a temperature of 96 degrees.  Yesterday the high was at 94 degrees - amazing temperatures for May. Green Bay WI ( Dave Parsons).

The Carp in the East River near my home are rising to the surface and exserting their mouths into the air, as though trying to "breath". The water is very turbid and there is virtually no flow. The recent hot weather may have rendered the river intolerable for many species, and certainly the Carp are not particulalrly fussy about high quality water.

May 23 A very hot day for this time of year. Green Bay's high temperature was 88° F, breaking the old record high of 86 set in 2007. Other area communities also set or tied record high temperatures. Another day or two of very hot weather is predicted.
May 22 Potentilla simplex (common cinquefoil) in flower, UWGB.
May 20

First Day of flower for Hydrophyllum virginianum (Virginia waterleaf) and Cornus alternifolia (alternate-leaved dogwood), UWGB.

Spittlebugs on plants, at my usual spot to check. Others reported a bit earlier.

I had my first mosquito bite today, in forest County. Only one bite and none in Brown County yet, though we have been seeing mosquitos for at least 10 days. I suspect the very dry weather has kept down the number of mosquitos in the Green Bay area, so far.

May 19

Saw a Monarch Butterfly in the yard midmorning, Shawano Co., Hoffa Park, Seymour (Elaine Olsen Friedrick).

May 18

Carp are spawning wildly in Green Bay along the lower Green Bay shoreline.

First day of flower for Streptopus lanceolatus (rose twisted-stalk), UWGB.

May 16

Killdeer Chick, Hartman Creek State Park, Waupaca Co. Wisconsin (Jeff Law).

Tiger swallowtails (butterflies) flying in substantial numbers in Florence County (Tom Erdman).

May 15

Cornus stolonifera (red-osier dogwood) and Podophyllum peltatum (May-apple) in flower, UW-Green Bay. Also the invasive species Hesperis matronalis (Dame's-rocket) in flower, UWGB.

June Bug, Town of Almond, Portage Co. Wisconsin (Jeff Law).

May 13 Silene latifolia (evening Lychnis; once known as Lychnis alba) in flower, City of Green Bay.
May 9 The earliest plants of Poa pratensis (Kentucky bluegrass) in anthesis, at base of walls, etc. Plants out in the open are not clost to flower yet.
May 8

Green Bay had 0.3 inches of snow this morning (a total of 1 inch for the two days) and a low temperature of 33 deg. F, but about 100 miles north 6.7 inches of snow fell at Laona WI and they report 5 inches on the ground. Very cold temperatures are forecast for tomorrow morning.

First day of flower for Comandra umbellata (bastard toadflax), and Galium aparine (cleavers) UWGB.

May 7 Green Bay had a low temperature of 33 deg. F this morning and a high of 45 with average wind speed of 14.5 mph and gusts in the 40's. We received 0.7 inches of snow before midnight tonight, and more is predicted continuing into tomorrow. Not much to report by the way of new flowering plants.
May 6 There are many showy flowers now from woody species in the Green Bay area. Among the more conspicuous are Malus pumila (apple), Crataegus spp. (Hawthorn or thorn apple), Prunus virginiana (choke cherry), Syringa vulgaris (lilac) and just beginning is the alien honeysuckle Lonicera X bella (showy bush honeysuckle).
May 5 First Day of flower for Alopecurus pratensis (meadow foxtail), another alien invader of wet soils. Also Aesculus hippocastanum (horse chestnut) in flower along city streets, Green Bay.
May 4

There were a pair of Sandhill Cranes feeding in a small wetland on the UW-Green Bay campus today. Thanks to Tom Erdman for spotting them and giving me the location.

First day of flower for Aquilegia canadensis (columbine). It may well have flowered a bit earlier on some sites, including the thin soils over limestone in the Door Peninsula.

First calling Green Frog in UW-Green Bay's PrairiePond, and first Red Admiral butterfly on UWGB (but see earlier report from April 28 in Outagamie County). Also first day for Fragaria virginiana (wild strawberry) in flower in our prairie.

First flowering plants I have seen of Alliaria petiolata (garlic mustard) on UWGB property, although others have reported flowering elsewhere for about 2 weeks.

May 3 First Day of flower for Polemonium reptans (one of the species known as "Jacob's-ladder", or "Greek Valerian") and for the invasive honeysuckle Lonicera X bella (showy bush honeysuckle).
May 2

Salix exigua (sandbar willow) in flower (anthesis), UWGB.

This is the first day I noticed baby Robins in the shrubs along our house.

May 1

Gray Tree Frogs calling conspicuously; House Wrens returned, Oconto County, Pensaukee (Tom Erdman).

We saw the first goslings of the Canada Geese nesting in our neighborhood, near the East River, Allouez (Kate Hutton).

Green Bay reached a high temperature of 70° F, about 11 degrees above "normal" for this date.

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Last updated on May 20, 2015