Climate and monthly weather forecastSaint Jacob, IL
Climate and monthly weather forecast
Weather in January
January, like December, in Saint Jacob, Illinois, is an icy winter month, with an average temperature ranging between max 36.9°F (2.7°C) and min 23.7°F (-4.6°C). January stands out as Saint Jacob's coldest month, with an average high-temperature of 36.9°F (2.7°C) and a low-temperature of 23.7°F (-4.6°C). Weather in January »Weather in February
The last month of the winter, February, is also an icy month in Saint Jacob, Illinois, with an average temperature varying between 41.5°F (5.3°C) and 27.3°F (-2.6°C). Stepping into February, Saint Jacob records an average high-temperature of a still icy 41.5°F (5.3°C), almost consistent with January. Weather in February »Weather in March
March, the first month of the spring in Saint Jacob, is a cool month, with temperature in the range of an average high of 53.4°F (11.9°C) and an average low of 37.2°F (2.9°C). The start of March is characterized by an increase in the average high-temperature, transitioning from a cold 41.5°F (5.3°C) in February to a cool 53.4°F (11.9°C). Weather in March »Weather in April
April is a refreshing spring month in Saint Jacob, Illinois, with an average temperature fluctuating between 47.3°F (8.5°C) and 64.2°F (17.9°C). Saint Jacob's weather in April presents a rise in the average high-temperature, moving from a cool 53.4°F (11.9°C) in March to an enjoyable 64.2°F (17.9°C). Weather in April »Weather in May
May, the last month of the spring in Saint Jacob, is a moderately hot month, with an average temperature ranging between min 57.4°F (14.1°C) and max 74.3°F (23.5°C). May shows a rise in the average high-temperature, moving from April's comfortable 64.2°F (17.9°C) to a moderately hot 74.3°F (23.5°C). Weather in May »Weather in June
The first month of the summer, June, is also a moderately hot month in Saint Jacob, Illinois, with an average temperature varying between 83.1°F (28.4°C) and 66.2°F (19°C). June's onset brings a subtle temperature rise, moving from 74.3°F (23.5°C) in May to a still moderately hot 83.1°F (28.4°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Saint Jacob, Illinois, with an average temperature fluctuating between 84.9°F (29.4°C) and 67.6°F (19.8°C). With average high and low temperatures of 84.9°F (29.4°C) and 67.6°F (19.8°C) respectively, July is Saint Jacob's warmest month. For July, the heat index is computed to be a very hot 96.8°F (36°C). Weather in July »Weather in August
August, the last month of the summer in Saint Jacob, is another warm month, with an average temperature fluctuating between 65.8°F (18.8°C) and 83.7°F (28.7°C). In August, Saint Jacob experiences a barely noticeable shift in meteorological conditions, with average high-temperatures moving from 84.9°F (29.4°C) in July to a still warm 83.7°F (28.7°C). Weather in August »Weather in September
September, the first month of the autumn in Saint Jacob, is still a warm month, with an average temperature ranging between max 78.1°F (25.6°C) and min 59.7°F (15.4°C). The onset of September aligns with a soft reduction in the average high-temperature, gently falling from 83.7°F (28.7°C) in August to a still moderately hot 78.1°F (25.6°C). Weather in September »Weather in October
October, the same as September, is another comfortable autumn month in Saint Jacob, Illinois, with an average temperature varying between 65.7°F (18.7°C) and 48.9°F (9.4°C). October comes with a drop in the average high-temperature, falling from September's moderately hot 78.1°F (25.6°C) to a comfortable 65.7°F (18.7°C). Weather in October »Weather in November
November, the last month of the autumn in Saint Jacob, is another cool month, with temperature in the range of an average low of 37.4°F (3°C) and an average high of 52.3°F (11.3°C). The beginning of November involves a decrease in the average high-temperature, transitioning from a comfortable 65.7°F (18.7°C) in October to a cool 52.3°F (11.3°C). Weather in November »Weather in December
The first month of the winter, December, is also a wintry month in Saint Jacob, Illinois, with an average temperature fluctuating between 41.5°F (5.3°C) and 30°F (-1.1°C). The shift from November to December involves a decrease in the average high-temperature, dropping from a fresh 52.3°F (11.3°C) to a wintry 41.5°F (5.3°C). Weather in December »Updated: Aug 5, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Temperature readings reach their annual highs in January, averaging 36.9°F (2.7°C) and a minimum average of 23.7°F (-4.6°C).
Throughout the year, there are 110.6 rainfall days, and 12.01" (305mm) of precipitation is accumulated.
January through March, October through December are months with snowfall.
Throughout the year, there are 15.9 snowfall days, and 2.32" (59mm) of snow is accumulated.
The months with the least sunshine are January and February, with an average of 4.6h of sunshine.
The months with the lowest UV index in Saint Jacob, Illinois, are January, February, November and December, with an average maximum UV index of 2.
The month with the least rainfall is February, when the rain falls for 6.1 days and typically collects 0.55" (14mm) of precipitation.
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 through September are months without snowfall.
The month with the most rainfall is May, when the rain falls for 13.1 days and typically aggregates up to 1.46" (37mm) of precipitation.
The months with the highest UV index are May through August, with an average maximum UV index of 6.
With an average of 14h and 48min of daylight, June has the longest days of the year.
June has the most sunshine of the year in Saint Jacob, Illinois, with an average of 10.6h of sunshine.
Saint Jacob's July weather, with an average high temperature of 84.9°F (29.4°C) and an average low temperature of 67.6°F (19.8°C), tends to be the warmest of the year.
July and August, with an average relative humidity of 80%, are most humid months.
The least humid month is October, with an average relative humidity of 71%.
December is the month with the most snowfall. Snow falls for 3.1 days and accumulates 0.94" (24mm) of snow.
With an average of 9h and 30min of daylight, December has the shortest days of the year.
Average temperature
Saint Jacob, IL
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (36.9°F).
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).
Average pressure
Saint Jacob, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Saint Jacob, IL
- Average wind speed in January:
9.8mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.4mph - Average wind speed in April:
9.3mph - Average wind speed in May:
7.7mph - Average wind speed in June:
6.7mph
- Average wind speed in July:
5.7mph - Average wind speed in August:
5.7mph - Average wind speed in September:
6.2mph - Average wind speed in October:
8.2mph - Average wind speed in November:
8.9mph - Average wind speed in December:
8.9mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).
Average humidity
Saint Jacob, IL
The months with the highest relative humidity are July and August (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Saint Jacob, IL
- Average rainfall in January:
0.91" - Average rainfall in February:
0.55" - Average rainfall in March:
0.91" - Average rainfall in April:
1.3" - Average rainfall in May:
1.46" - Average rainfall in June:
1.3"
- Average rainfall in July:
1.34" - Average rainfall in August:
1.14" - Average rainfall in September:
0.59" - Average rainfall in October:
1.02" - Average rainfall in November:
0.71" - Average rainfall in December:
0.79"
The wettest month (with the highest rainfall) is May (1.46").
The driest month (with the least rainfall) is February (0.55").
Average rainfall days
Saint Jacob, IL
- Average rainfall days in January:
5.9 days - Average rainfall days in February:
6.1 days - Average rainfall days in March:
10.2 days - Average rainfall days in April:
12 days - Average rainfall days in May:
13.1 days - Average rainfall days in June:
11.1 days
- Average rainfall days in July:
12.9 days - Average rainfall days in August:
9.7 days - Average rainfall days in September:
9.5 days - Average rainfall days in October:
7.3 days - Average rainfall days in November:
6.9 days - Average rainfall days in December:
5.9 days
The month with the highest number of rainy days is May (13.1 days).
The months with the least rainy days are January and December (5.9 days).
Average snowfall
Saint Jacob, IL
The month with the highest snowfall is December (0.94").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days
Saint Jacob, IL
- Average snowfall days in January:
4.8 days - Average snowfall days in February:
4.8 days - Average snowfall days in March:
1.7 days - Average snowfall days in April:
0.2 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:
0.1 days - Average snowfall days in November:
1.2 days - Average snowfall days in December:
3.1 days
The months with the highest number of snowfall days are January and February (4.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Saint Jacob, IL
- Average daylight in January:
9h and 48min - Average daylight in February:
10h and 48min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 12min - Average daylight in May:
14h and 18min - Average daylight in June:
14h and 48min
- Average daylight in July:
14h and 36min - Average daylight in August:
13h and 36min - Average daylight in September:
12h and 24min - Average daylight in October:
11h and 12min - Average daylight in November:
10h and 6min - Average daylight in December:
9h and 30min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in January:
4h and 36min - Average sunshine in February:
4h and 36min - Average sunshine in March:
6h and 30min - Average sunshine in April:
8h and 30min - Average sunshine in May:
9h and 24min - Average sunshine in June:
10h and 36min
- Average sunshine in July:
10h and 24min - Average sunshine in August:
10h and 12min - Average sunshine in September:
9h and 30min - Average sunshine in October:
6h and 18min - Average sunshine in November:
5h and 36min - Average sunshine in December:
4h and 48min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).
Average sunshine days
Saint Jacob, IL
- Average sunshine days in January:
21.3 days - Average sunshine days in February:
18.3 days - Average sunshine days in March:
17.4 days - Average sunshine days in April:
16.2 days - Average sunshine days in May:
14.8 days - Average sunshine days in June:
15.6 days
- Average sunshine days in July:
14.5 days - Average sunshine days in August:
17.3 days - Average sunshine days in September:
18.3 days - Average sunshine days in October:
21.5 days - Average sunshine days in November:
20.9 days - Average sunshine days in December:
21.8 days
The month with the most sunshine days is December (21.8 days).
The month with the least sunshine days is July (14.5 days).
Average UV index
Saint Jacob, IL
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Saint Jacob, IL
The months with the most cloud cover are January and February (Cloud cover 50).
The months with the least cloud cover are June, July, August and September (Cloud cover 28).
Average visibility
Saint Jacob, IL
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
