Indianapolis Climate Records and Averages

Indianapolis, Indiana is located in the central part of the state and is situated on level or slightly rolling terrain. The city has a temperate climate, with very warm summers and no dry season. Very cold temperatures can occur with the invasion of continental polar air during winter. The polar air can be quite frigid with very low humidity. The arrival of maritime tropical air from the Gulf in the summer brings warm temperatures and moderate humidity. One of the longest and most severe heat waves brought temperatures of 100 degrees or more for nine consecutive days.

Precipitation is distributed fairly evenly throughout the year, therefore there is no pronounced wet or dry season. Rainfall in the spring and summer is produced mostly by showers and thunderstorms. A rainfall of about 2 1/2 inches in a 24–hour period can be expected about once a year. Snowfalls of 3 inches or more occur on an average of two or three times each winter.

	Monthly Averages			Daily Extremes				Monthly Extremes				Max. Temp.		Min. Temp.
Temperatures in F	Max.	Min.	Avg	High	Date of daily extreme high	Low	Date of daily extreme low	Highest Avg	Year	Lowest Avg	Year	# Days >= 90 F	# Days <= 32 F	# Days <= 32 F	# Days<= 0 F
January	35.3	19.4	27.3	71	25/1950	-27	19/1994	39.7	2006	10.2	1977	0.0	12.5	26.8	3.0
February	39.6	22.6	31.1	74	29/1972	-21	10/1982	40.8	1998	17.8	1978	0.0	7.7	23.2	1.5
March	50.5	31.6	41.1	85	31/1981	-7	02/1980	49.4	1973	26.2	1960	0.0	2.1	17.2	0.1
April	63.3	42.1	52.7	89	30/1970	18	13/1950	59.6	2010	45.6	1961	0.0	0.0	5.0	0.0
May	73.3	52.0	62.7	93	25/1965	28	10/1966	70.6	1977	56.4	1961	0.4	0.0	0.3	0.0
June	82.2	61.5	71.9	102	26/1954	37	22/1992	76.6	1952	66.8	1958	3.9	0.0	0.0	0.0
July	85.2	65.3	75.3	104	14/1954	48	04/1968	79.7	1983	70.9	2009	6.7	0.0	0.0	0.0
August	84.0	63.4	73.7	102	16/1988	41	29/1965	80.1	1983	68.9	1963	5.2	0.0	0.0	0.0
September	77.7	55.7	66.7	100	01/1953	32	30/1993	71.7	2007	60.6	1949	2.0	0.0	0.0	0.0
October	65.9	44.1	55.0	91	08/2007	20	26/1962	62.1	2007	48.1	1988	0.1	0.0	3.4	0.0
November	51.5	33.9	42.7	81	01/1950	-2	25/1950	49.5	2001	34.6	1976	0.0	1.3	14.3	0.0
December	39.3	24.1	31.7	74	02/1982	-23	22/1989	40.2	1982	18.5	1963	0.0	8.3	24.3	1.2

Annual	62.3	43.0	52.6	104	1954/07/14	-27	1994/01/19	56.0	1998	50.0	1963	18.3	31.9	114.4	5.9

Winter	38.1	22.0	30.0	74	1972/02/29	-27	1994/01/19	36.9	1998	21.0	1977	0.0	28.5	74.3	5.7
Spring	62.4	41.9	52.1	93	1965/05/25	-7	1980/03/02	58.0	1977	46.6	1960	0.4	2.1	22.5	0.1
Summer	83.8	63.4	73.6	104	1954/07/14	37	1992/06/22	78.1	2010	70.3	1992	15.8	0.0	0.0	0.0
Fall	65.0	44.6	54.8	100	1953/09/01	-2	1950/11/25	59.0	2007	48.9	1976	2.1	1.3	17.7	0.0

												Total Snowfall
	Avg.	High	Year	Low	Year	1 Day Max.		>= 0.01 in.	>= 0.10 in.	>= 0.50 in.	>= 1.00 in.	Mean	High	Year
	in.	in.	-	in.	-	in.	dd/yyyy or yyyymmdd	# Days	# Days	# Days	# Days	in.	in.	-
January	2.89	12.69	1950	0.36	1981	2.82	03/1950	12	6	2	1	7.9	30.6	1978
February	2.44	5.35	1971	0.36	1978	2.49	26/1977	10	5	2	0	6.2	21.7	2003
March	3.58	10.74	1963	0.64	2001	3.00	04/1963	13	7	2	1	3.2	12.5	1996
April	3.70	8.09	1964	0.98	1976	2.56	25/1961	12	8	3	1	0.4	3.7	1957
May	4.28	9.25	1968	1.06	1988	3.80	30/2004	12	8	3	1	0.0	0.2	1989
June	4.16	10.26	1998	0.36	1988	3.80	07/1963	10	7	3	1	-	-	-
July	4.35	11.79	1992	0.55	1997	5.09	01/1987	10	7	3	1	-	-	-
August	3.32	8.34	1980	0.37	2010	4.46	06/1976	9	5	2	1	-	-	-
September	2.95	10.37	2003	0.24	1963	7.20	01/2003	8	5	2	1	-	-	-
October	2.82	7.84	1986	0.17	1963	3.88	10/1959	8	5	2	1	0.2	9.3	1989
November	3.37	8.50	1985	0.69	1999	4.15	14/1993	10	6	2	1	1.6	8.3	1966
December	3.12	7.72	1990	0.45	1976	2.12	14/1971	12	7	2	1	5.6	27.5	1973

Annual	41.00	56.81	1996	27.93	1954	7.20	2003/09/01	127	77	28	10	25.0	44.5	1977

Winter	8.45	22.33	1950	2.82	1963	2.82	1950/01/03	34	18	5	2	19.6	51.0	1982
Spring	11.56	21.05	1961	6.10	1966	3.80	2004/05/30	37	23	8	2	3.6	10.6	1975
Summer	11.84	21.08	1979	5.30	1966	5.09	1987/07/01	29	19	8	3	-	-	-
Fall	9.15	16.69	2003	2.59	1963	7.20	2003/09/01	26	16	6	2	1.8	9.9	1989

Winter = Dec, Jan, and Feb		Spring = Mar, Apr, and May
Summer = Jun, Jul, and Aug.		Fall = Sep, Oct, and Nov