Climate and monthly weather forecastGalena, IL
Climate and monthly weather forecast
The climate of Galena
Galena, a city in northern Illinois, USA, is classified under the Köppen climate system as Dfa. This classification symbolizes a humid continental climate, with no distinct dry season and a hot summer. On an annual basis, Galena experiences a wide range of temperatures from as low as 12.4°F (-10.9°C) to a high of 79.7°F (26.5°C).This Midwest city receives robust rainfall with an average accumulation ranging from 1.26" (32mm) to 4.29" (109mm) throughout the year. The frequency of rainfall also differs from month to month, peaking in May with an average of 20 rainy days. However, even the driest month, February, still observes a rainfall average of 1.42" (36mm) across 4.8 days.
The city's humidity does not exhibit extreme variations, fluctuating between 76% to 87%. The duration of daylight varies from 9.1 hours in December to a generous 15.2 hours in June, while sunshine hours range from a minimum of 4.1 to a maximum of 9.8 hours a day.
Galena experiences minimal snowfall from May through to October with the numbers climbing from November through February, when it reaches a height of 5.12" (130mm) in January. Winter months also experience fewer sunshine days and the ultraviolet index is at the lowest number during this period.
The best time to visit Galena
If warm weather and long days are preferred, planning a trip to Galena between May and September would be ideal. During these months, the city experiences the maximum temperature hovering around mid-70s°F and more than 14 hours of daylight. Moreover, these are the months when the sunshine hours peak at around 8 to 9 hours a day, providing ample opportunities for outdoor activities and sightseeing.The worst time to visit Galena
For those averse to cold weather, it would be best to sidestep a trip to Galena between December to February. During this time of year, temperatures plummet to the low teens°F and daylight hours are at a year-round low of around 9 hours. Furthermore, these winter months observe substantial snowfall, reaching a maximum of over 5" (127mm) in January, potentially disrupting travel and outdoor activities.Spring weather in Galena
Springtime in Galena signals a gradual uptick in temperatures, along with an increase in rainfall. The temperatures during these months (March to May) swing between 28.8°F (-1.8°C) and 67.6°F (19.8°C). Rainfall is frequent, peaking at 4.09" (104mm) in May spread across 20 days.Summer weather in Galena
Between June and August, Galena experiences warm and comfortable weather. Temperatures during this time remain relatively stable, with lows around 59.4°F (15.2°C) and highs peaking at 79.7°F (26.5°C) in July. Despite the summer season, Galena experiences moderate rainfall, with an average amount of under 4.29" (109mm).Autumn weather in Galena
Autumn, between September and November, in Galena ushers in a crispness to the air, as temperatures retreat from the highs of summer. The mercury fluctuates between 42.4°F (5.8°C) and 73°F (22.8°C) and is accompanied by differences in daily rainfalls, peaking at 2.72" (69mm) in October.Winter weather in Galena
Winter in Galena is characterized by cold temperatures, a decrease in daylight hours, and frequent snowfall. A noticeable drop in temperature happens during these months (December to February) with lowest temperatures recorded between 12.4°F (-10.9°C) to 21.4°F (-5.9°C). Snowfall reaches the peak of 5.12" (130mm) in January and daylight hours are notably shortened to about 9 hours. Therefore, this period is well suited to those with a fondness for winter sports or cooler weather.Weather in January
In January, Galena, Illinois, experiences one of its coldest months of the year. The month of January ushers in an array of snowfall with an average of 5.12" (130mm), making it a picturesque winter season. The weather is characterized by shorter daylight hours and longer nights. Weather in January »Weather in February
February weather in Galena, takes a shift towards slightly warmer temperatures compared to previous month. However, colder temperatures still dominate the scene, at times dropping to 15.8°F (-9°C). The snow accumulation lessens to some degree, providing breaks between the previous month's frequent snowfalls. Weather in February »Weather in March
Weather in March brings not only the spring season but also a dramatic increase in daylight hours. The departure from the wintry weather can be observed as snowfall reduces to an average of 2.05" (52mm). This month's weather allows for longer outdoor activities as daylight stretches past the previous winter months. Weather in March »Weather in April
Coming out from the winter, April weather in Galena becomes increasingly warm and wet. Distinct from the cold and dry conditions of March, April receives a dramatic increase in rainfall, averaging 3.35" (85mm). This transformation to warmer weather aids in the blooming of flora and fauna. Weather in April »Weather in May
May is a month where Galena sees a significant peak in temperature, as well as a notable elevation of both rainfall and humidity. It boasts the highest rainfall of the year, with an average of 4.09" (104mm), being an undeniable month of the wet season. Weather in May »Weather in June
Galena's climate in June experiences an increment in temperature, building up the summer's heat. Sunshine dominates the weather during this period, with an average of 9.5 sunshine hours per day. June marks a distinct shift in weather, where warmth becomes prevalent. Weather in June »Weather in July
In July, the weather in Galena reaches its peak summertime characteristics. Notably, this is the hottest month of the year with high temperatures scaling to 79.7°F (26.5°C). Coupled with long daylight hours, July invites a range of outdoor activities. Weather in July »Weather in August
August weather in Galena marks the nearing end of the summer season. Although the temperature remains relatively high, a slight decline begins to emerge from the month's peak in July. The rainfall pattern takes a plunge, with a decrease observed from the amount in July. Weather in August »Weather in September
September brings noticeable changes in Galena's weather as the fall season settles in. Modest drops in temperature signify the transition from summer's heat. However, the arrival of fall does not mean the end of sun-drenched days, with an average of 9 sunshine hours daily. Weather in September »Weather in October
October is a month of visible weather changes in Galena. The arrival of fall sees a marked decline in temperature, with cold nights becoming more frequent. Rainfall remains a prominent feature, though not at the levels of the summer months. Weather in October »Weather in November
With November's arrival, winter starts to draw closer in Galena. The cold weather becomes more intense, a sharp contrast to the previous mildness of October. November sees an average maximum wind speed of 10.6mph (17.1km/h), signifying the windy nature of the month. Weather in November »Weather in December
December in Galena ushers in the full swing of winter, with dropping temperatures and increasing snowfall. The weather can be characterized by its lower visibility, limited to an average of 6 miles. Despite the inclement conditions, the Christmas festivities provide a burst of warmth. Weather in December »Updated: Aug 19, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
With an average high-temperature of 25°F (-3.9°C) and an average low-temperature of 12.4°F (-10.9°C), January is the coldest month.
With an average relative humidity of 87%, January is the most humid month in Galena.
The month with the least rainfall is January, when the rain falls for 5.4 days and typically collects 1.26" (32mm) of precipitation.
In Galena, during the entire year, the rain falls for 153.1 days and collects up to 30.75" (781mm) of precipitation.
Months with snowfall are January through April, October through December.
The month with the most snowfall is January, when snow falls for 13.2 days and typically aggregates up to 5.12" (130mm) of snow.
Throughout the year, there are 46.9 snowfall days, and 17.52" (445mm) of snow is accumulated.
January has the least sunshine of the year, with an average of 3.7h of sunshine.
The months with the lowest UV index in Galena are January and December, with an average maximum UV index of 1.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.
April and October, with an average relative humidity of 76%, are the least humid months.
In Galena, snow does not fall in May through September.
June is the month with the most rainfall. Rain falls for 19.5 days and accumulates 4.29" (109mm) of precipitation.
June has the longest days of the year, with an average of 15h and 12min of daylight.
June and July, with an average maximum UV index of 6, are months with the highest UV index.
The warmest time of the year is July, with temperatures averaging a high of 79.7°F (26.5°C) and a low of 63°F (17.2°C).
August has the most sunshine of the year, with an average of 9.8h of sunshine.
December has the shortest days of the year, with an average of 9h and 6min of daylight.
Average temperature
Galena, IL
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (25°F).
The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).
Average pressure
Galena, IL
- Average pressure in January:
30.12"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.9"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Galena, IL
- Average wind speed in January:
9.9mph - Average wind speed in February:
10mph - Average wind speed in March:
9.9mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.8mph - Average wind speed in June:
7.6mph
- Average wind speed in July:
6.7mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.6mph - Average wind speed in October:
9.2mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.6mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity
Galena, IL
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April and October (76%).
Average rainfall
Galena, IL
- Average rainfall in January:
1.26" - Average rainfall in February:
1.42" - Average rainfall in March:
1.73" - Average rainfall in April:
3.35" - Average rainfall in May:
4.09" - Average rainfall in June:
4.29"
The wettest month (with the highest rainfall) is June (4.29").
The driest month (with the least rainfall) is January (1.26").
Average rainfall days
Galena, IL
- Average rainfall days in January:
5.4 days - Average rainfall days in February:
4.8 days - Average rainfall days in March:
11.2 days - Average rainfall days in April:
16.8 days - Average rainfall days in May:
20 days - Average rainfall days in June:
19.5 days
- Average rainfall days in July:
18.6 days - Average rainfall days in August:
14.5 days - Average rainfall days in September:
12.6 days - Average rainfall days in October:
12.9 days - Average rainfall days in November:
9.2 days - Average rainfall days in December:
7.6 days
The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is February (4.8 days).
Average snowfall
Galena, IL
The month with the highest snowfall is January (5.12").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Galena, IL
- Average snowfall days in January:
13.2 days - Average snowfall days in February:
10.5 days - Average snowfall days in March:
6.3 days - Average snowfall days in April:
1.9 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
1 days - Average snowfall days in November:
3.5 days - Average snowfall days in December:
10.5 days
The month with the highest number of snowfall days is January (13.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Galena, IL
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 6min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in January:
3h and 42min - Average sunshine in February:
3h and 48min - Average sunshine in March:
6h and 12min - Average sunshine in April:
7h and 30min - Average sunshine in May:
8h and 24min - Average sunshine in June:
9h and 30min
- Average sunshine in July:
9h and 42min - Average sunshine in August:
9h and 48min - Average sunshine in September:
9h and 0min - Average sunshine in October:
5h and 18min - Average sunshine in November:
5h and 0min - Average sunshine in December:
4h and 6min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Galena, IL
- Average sunshine days in January:
15.3 days - Average sunshine days in February:
14.1 days - Average sunshine days in March:
14.4 days - Average sunshine days in April:
10.6 days - Average sunshine days in May:
8.8 days - Average sunshine days in June:
7.9 days
- Average sunshine days in July:
8.8 days - Average sunshine days in August:
13.4 days - Average sunshine days in September:
14.6 days - Average sunshine days in October:
15.4 days - Average sunshine days in November:
17.1 days - Average sunshine days in December:
15.7 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (7.9 days).
Average UV index
Galena, IL
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Galena, IL
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility
Galena, IL
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
