Climate of Green Bay, Wisconsin

The Climate of Green Bay, Wisconsin is similar to that of many other cities in the Midwestern United States. The city experiences a humid continental climate (Koppen climate classification Dfb inland, Dfa on the lake), with some moderation due to the city's proximity to Lake Michigan. Like other cities with this type of climate, there are four distinct seasons, often with severe or extreme variation between them in terms of temperature and precipitation. Green Bay experiences warm, humid, frequently hot summers and long, cold and snowy winters.

Temperature

The warmest month in Green Bay is July, when the average high temperature is 81 °F (27 °C)^[1]. During July, the average low temperature is 59 °F (15 °C)^[1]. The coldest month of the year is January, when the high temperature averages only 24 °F (-4 °C), and the low temperatures average 7 °F (-14 °C)^[1]. Temperature variation between months is highest in spring and autumn. The average annual temperature is just (43 °F) 6 °C, making it the coldest city in the continental US with a population of more than 100,000 people.

Monthly average temperatures in Green Bay, Wisconsin^[1]

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
High (°F)	24	29	40	55	68	77	81	79	70	58	42	29
Low (°F)	7	12	23	34	45	54	59	57	48	37	26	13
High (°C)	-4	-2	4	12	20	25	27	26	21	14	6	-2
Low (°C)	-14	-11	-5	1	7	12	15	14	9	2	-3	-10

The highest temperature ever recorded in Green Bay is 104 °F (40 °C), which was recorded on July 13, 1936, during the Dust Bowl^[2]. The coldest temperature on record is -33 °F (-36 °C), on February 10, 1899^[3].

Record temperatures by month, Green Bay, Wisconsin^[1]

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Record high (°F)	56	61	82	89	99	101	104	100	97	88	74	64
°C	13	16	28	32	37	38	40	38	36	31	23	18
Record low (°F)	-31	-33	-29	7	21	32	40	38	24	12	-9	-27
°C	-35	-36	-34	-14	-6	0	4	3	-4	-11	-23	-33

Precipitation

The wettest month in Green Bay is August, when 3.77 inches (95.8 mm) of precipitation falls, mostly in the form of rainfall from thunderstorms^[1]. The driest month in Green Bay is February, when the majority of precipitation falls as low moisture-content snow due to cold, dry air. On average, only 1.01 inches (25.7 mm) of precipitation falls in February^[1]. An average winter in Green Bay produces 47.7 inches (1.21 m) of snowfall^[4]. January is the snowiest month, averaging 11.7 inches (0.30 m)^[4].

Average monthly precipitation, Green Bay, Wisconsin^[1]

Month	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Precipitation (inches)	1.21	1.01	2.06	2.56	2.75	3.43	3.44	3.77	3.11	2.17	2.27	1.41
millimeters	30.7	25.7	52.3	65.0	69.9	87.1	87.4	95.8	79.0	55.1	57.7	35.8

Notes

1. ^ ^{a b c d e f g h} Average and record temperatures and precipitation by month, Green Bay, Wisconsin, The Weather Channel. [1]
2. ^ Daily average and record temperatures for July, Green Bay, Wisconsin, The Weather Channel. [2]
3. ^ Daily average and record temperatures for February, Green Bay, Wisconsin, The Weather Channel. [3]
4. ^ ^{a b} Average annual snowfall by month at selected locations, NOAA [4]

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