city of St. Jacob in Illinois Typical Weather By Month, Average Temperature and More

Weather Reports for the city of St. Jacob in Illinois

snow

rain

temp

wind

humidity

Temperature

	Jan	Feb	Mar	Apr	May	Jun
Average High (°F)	40.6	44.2	57.4	68.8	77.3	86.5
Average Low (°F)	24.0	26.1	37.1	46.2	56.7	65.7
All Time High (°F)	71.1	81.5	86.0	90.0	98.4	107.1
All Time Low (°F)	-15.7	-7.6	1.4	22.1	33.1	47.3

	Jul	Aug	Sep	Oct	Nov	Dec
Average High (°F)	88.9	87.0	82.1	70.0	55.6	46.3
Average Low (°F)	68.9	66.2	59.4	47.9	35.4	29.5
All Time High (°F)	107.1	100.9	102.0	94.6	84.9	77.0
All Time Low (°F)	49.5	50.0	37.9	21.9	5.0	-0.4

Rain

	Jan	Feb	Mar	Apr	May	Jun
Percent of Rainy Days	0.2	0.2	0.3	0.3	0.3	0.2
Avg. Rainfall (in) on Rainy Day	0.4	0.3	0.3	0.5	0.4	0.4
All Time Rainfall (in) on Rainy Day	2.5	2.1	2.0	5.2	3.0	3.9
30 Day Rain Accumulation	2.1	1.7	2.8	4.4	3.8	3.5
All Time 30 Day Rain Accumulation	6.6	6.4	6.4	11.4	8.6	14.2

	Jul	Aug	Sep	Oct	Nov	Dec
Percent of Rainy Days	0.2	0.2	0.2	0.2	0.2	0.2
Avg. Rainfall (in) on Rainy Day	0.5	0.5	0.4	0.3	0.3	0.4
All Time Rainfall (in) on Rainy Day	3.4	4.3	4.5	4.5	2.3	4.2
30 Day Rain Accumulation	3.2	3.1	2.7	2.1	2.5	2.4
All Time 30 Day Rain Accumulation	9.4	8.1	8.8	5.6	6.0	9.1

Snow

	Jan	Feb	Mar	Apr
Percent of Days with Snowfall	0.1	0.1	0.1	0.0
Avg. Snowfall Depth (in)	1.6	1.6	0.6	0.2
30 Day Snowfall Total (in)	5.5	5.5	1.0	0.1
All Time Snowfall Depth (in)	18.3	16.4	6.6	1.8
All Time 30 Day Snowfall Total (in)	22.5	18.4	8.6	1.8

	Oct	Nov	Dec
Percent of Days with Snowfall	0.0	0.0	0.1
Avg. Snowfall Depth (in)	0.4	0.7	1.9
30 Day Snowfall Total (in)	0.0	0.6	3.2
All Time Snowfall Depth (in)	0.4	2.9	35.4
All Time 30 Day Snowfall Total (in)	0.4	5.7	53.8

Humidity

Instead of using humidity directly we use dew point to measure what people commonly mean when saying it feels humid. Dew point is classified into 4 categories: Dry (under 25°F), Comfortable (25°F to 60°F), Muggy (60°F to 70°F) and Oppressive (70°F or greater). The table below shows the percentage of days with a dew point within a particular class.

	Jan	Feb	Mar	Apr	May	Jun
Dry	51.0	48.5	17.4	4.1	0.0	0.0
Comfortable	48.8	51.5	81.6	90.1	57.6	23.1
Muggy	0.2	0.0	1.0	5.8	40.4	50.6
Oppressive	0.0	0.0	0.0	0.0	2.0	26.3

	Jul	Aug	Sep	Oct	Nov	Dec
Dry	0.0	0.0	0.0	1.2	17.3	30.4
Comfortable	7.7	14.9	48.6	83.7	81.4	69.3
Muggy	41.7	47.4	39.6	15.0	1.3	0.3
Oppressive	50.5	37.7	11.9	0.2	0.0	0.0

Wind Speed (mph)

The table below shows the distribution of average wind speeds in miles per hour for a given month or day. Wind speed may vary throughout a day and we show the average speed. Peak gusts or sustained maximum speeds may be significantly higher.

	Jan	Feb	Mar	Apr	May	Jun
10th	4.0	4.0	4.0	4.4	4.0	3.5
25th	5.2	5.6	5.7	5.8	5.3	5.0
50th	7.2	7.5	7.9	7.9	6.9	6.8
75th	10.4	10.6	10.9	10.9	9.4	8.9
90th	13.9	13.9	14.1	14.2	12.4	11.5

	Jul	Aug	Sep	Oct	Nov	Dec
10th	3.4	3.4	3.4	3.8	3.5	3.5
25th	4.7	4.6	4.6	5.0	5.1	4.9
50th	5.8	5.8	5.8	6.9	6.9	6.8
75th	7.9	7.7	8.0	9.4	9.8	9.4
90th	10.0	9.8	10.3	12.4	13.3	12.7

Wind Directions

The table below shows the distribution of wind direction (wind coming out of a particular direction) for a given month or day. Wind direction may vary throughout a day and the computation accounts for all measured changes in direction througout the day or month.

	Jan	Feb	Mar	Apr	May	Jun
North	12.6	19.6	16.8	12.1	11.8	8.6
NorthEast	4.8	6.7	8.8	6.6	6.5	6.4
East	7.9	9.6	12.8	12.0	10.7	9.3
SouthEast	10.6	10.2	13.1	14.2	16.0	13.6
South	17.0	14.0	16.7	20.7	23.0	27.7
SouthWest	8.0	6.4	5.5	7.2	8.9	12.6
West	18.0	13.6	11.1	13.2	10.8	11.4
NorthWest	21.2	19.8	15.2	14.0	12.2	10.5

	Jul	Aug	Sep	Oct	Nov	Dec
North	13.2	13.8	16.8	13.9	13.2	12.2
NorthEast	10.0	8.6	7.9	4.9	3.7	4.9
East	12.7	13.5	11.7	7.7	6.9	8.9
SouthEast	13.5	16.3	13.6	11.7	16.1	13.7
South	22.0	21.6	21.3	22.9	26.1	19.6
SouthWest	10.5	8.7	7.3	8.7	6.1	7.3
West	9.0	8.3	9.0	14.6	12.2	15.5
NorthWest	9.1	9.2	12.3	15.6	15.7	17.9