The Climate in Southwest Indiana

Although Southwest Indiana is over 500 miles from the Gulf of Mexico, its weather is influenced by the warm, moist air masses from the south. This pattern prevails most of the year, although it is occasionally interrupted by cold fronts that slide south during the winter.

Despite these cold periods, the weather overall is more southern than northern. This is frequently seen in the temperature variations between Southwest Indiana and Chicago, where it is not unusual to have more than a ten-degree difference in the winter. Snowfall varies a great deal from year to year and significant accumulation (6 inches or more) is rare.

The following climate information is a generalization for the area.

Zero degree days - 3
Freezing days - 103
90 degree days - 39
Sunshine days - 203
Wind speed - 8.3 mph
Relative humidity - 70%
Average annual rainfall- 42 inches
Average annual snowfall - 13 inches

**AVERAGE TEMPERATURES**
Month	Daily Low		Daily High		Monthly Mean
Month	F	C	F	C	F	C
January	23.7	-5	41.5	5	32.6	0
February	26.4	-3	45.4	7	35.9	2
March	34	1	54.6	13	44.3	7
April	45.5	8	67.9	20	56.7	14
May	54.4	12	77	25	65.7	19
June	63.4	17	86	30	74.7	24
July	66.7	19	88.9	32	77.8	25
August	64.4	18	88	31	76.2	25
September	56.7	14	81.4	27	69.1	21
October	45.2	7	71.2	22	58.2	15
November	34.5	1	55.2	13	44.9	7
December	26.5	-3	44	7	35.3	2

**AVERAGE HUMIDITY**
Jan	Feb	Mar	April	May	June	July	Aug	Sept	Oct	Nov	Dec
77	69	71	67	69	71	72	73	74	72	74	78