Weather in Green Bay

Planning your day in Green Bay? Check out the most up-to-date weather data and forecasts right here. Below you will find all the necessary information to be prepared for any whims of nature.

The climate in Green Bay, located in the United States, is characterised as continental with four distinct seasons. The city experiences significant temperature fluctuations throughout the year, which is typical for this type of climate. Winters here are cold, while summers are warm, creating diverse weather conditions for visitors depending on the time of their trip.

The summer months, from June to August, in Green Bay are warm, with average temperatures around 20-22°C, sometimes reaching 25-27°C. This is the wettest period of the year, although the total amount of rainfall remains moderate. Winters, on the other hand, are cold, especially in January and February, when average temperatures drop below -5°C, and minimums can reach -9°C and lower. Spring and autumn are transitional seasons with gradual temperature changes and moderate precipitation. In spring, from March to May, noticeable warming occurs, while in autumn, from September to November, temperatures gradually decrease, preparing the city for winter.

Overall, the weather in Green Bay offers a diverse experience. Travellers should expect cold and snowy weather in winter, warm and sunny conditions in summer, and milder but changeable conditions in spring and autumn. The number of rainy days is relatively evenly distributed during the warm months, with a slight increase in the spring-summer period.

The climate in Green Bay is characterised by significant seasonal temperature fluctuations. The annual temperature range is quite wide: from severe winter frosts to warm summers. The coldest month is usually January, with an average temperature of around -5.7°C, although February also brings severe cold, especially at night when temperatures can drop to an average of -9.8°C. The hottest month becomes July, when the average temperature reaches 22.4°C, and daytime highs can rise to an average of 27.1°C.

Winters in Green Bay are prolonged and frosty. From December to February, the thermometer consistently stays below zero. In January and February, average minimum temperatures drop to -9.1°C and -9.8°C respectively, while average maximums rarely exceed -0.8°C (in February) or remain at the level of -2.4°C (in January). Even in December, which is comparatively "mild" among the winter months, the average temperature is -2.4°C. Diurnal temperature fluctuations are also present in winter, averaging 6-9°C. Snow cover and ice are a common phenomenon for this period.

The summer months, from June to August, bring pleasant warmth to Green Bay, which can at times turn into heat. In July, the warmest month, the average daytime temperature is 22.4°C, with maximum values reaching an average of 27.1°C, and minimum nightly temperatures around 17.6°C. June and August are also warm, with average temperatures of 20.1°C and 21.3°C respectively. The summer period is characterised by noticeable diurnal temperature fluctuations: the difference between daytime highs and nightly lows can be around 9-10°C, providing cooler and more comfortable evenings after warm days.

In Green Bay, precipitation is observed year-round, but its intensity and character vary depending on the season. There is no clearly defined rainy season or drought period here, however, changes in the total volume of precipitation and the number of days with it can be traced.

The winter months, from December to February, are characterised by the lowest amount of precipitation, averaging 1-2 mm per month. Given that average temperatures at this time drop below zero, precipitation predominantly falls as snow. In January and February, there are usually about 7 days with precipitation. In spring, from March to May, the amount of precipitation gradually increases from 2 mm to 3 mm. While snowfalls and mixed precipitation are still possible in March, by May it is typically rain. The number of days with precipitation also increases, reaching 13 days in April.

The summer months, June and July, are periods with the highest average monthly precipitation, reaching 4 mm. June also records one of the maximum values for the number of days with precipitation — around 13. In August, the volume of precipitation decreases slightly to 3 mm, and the number of rainy days drops to 10. In summer, precipitation falls in the form of rain. In autumn, from September to November, the amount of precipitation fluctuates between 2-3 mm. In September and October, this is predominantly rain, with 10-11 rainy days per month, whereas in November, as temperatures drop, mixed precipitation and a transition to snow become likely again, and the number of days with precipitation decreases to 8.

When planning a trip to Green Bay, it is important to consider significant temperature fluctuations throughout the year. The principle of layering in clothing will become your best friend, allowing you to adapt to changing conditions. Regardless of the season, comfortable walking shoes are mandatory, as you will likely be walking a lot while exploring the city.

The winter months (December-February) and early spring (March) in Green Bay are cold, with average temperatures significantly below zero. You will need a very warm winter jacket, a hat, gloves, a scarf, and possibly thermal underwear. Although the amount of precipitation in millimetres is small, snowy days are frequent, so waterproof and insulated footwear will be handy. Late autumn (November) also requires warm clothing, as temperatures drop close to freezing. In the off-season, such as April and October, the weather can be unpredictable, so pack sweaters, fleece tops, and a windbreaker or light jacket.

Summer (June-August) in Green Bay is warm, with average temperatures around 20-22°C. Light clothing will suit: t-shirts, shorts, dresses. However, even in summer there are rainy days (10-13 per month), so a light waterproof jacket or an umbrella will be useful. Don't forget sunscreen and a hat for protection from the sun on clear days. May and September offer pleasant, moderate weather, ideal for walks, but evenings can be cool, so a light sweater or jacket will come in handy.