Baltimore Climate Records and Averages

Baltimore-Washington lies in a region about midway between the rigorous climates of the North and the mild climates of the South. The city is adjacent to the modifying influences of the Chesapeake Bay/Atlantic Ocean to the east and the Appalachian Mountains to the west. Since this region is near the normal path of low pressure systems which move across the country, changes in wind direction are frequent which contributes to the changeable character of Baltimore's climate.

For the most part, precipitation is evenly distributed throughout the year, with the the highest amounts during the summer and early fall months, the seasons for hurricanes and severe thunderstorms.

The average date for the last occurrence in spring of temperatures as low as 32 degrees is mid–April. The average date for the first occurrence in fall of temperatures as low as 32 degrees is late October. The freeze–free period is approximately 194 days.

January is the coldest month, and July, the warmest. Snowfall occurs on an average of eleven days per year, with six days receiving snowfalls of 1 inch or greater. Snow is frequently mixed with rain and sleet and snow seldom remains on the ground more than a few days.

Freezing rain occurs on an average of two to three times per year, generally in January or February. Some years pass without the occurrence of freezing rain, while in others it occurs on as many as eight to ten days. Sleet is observed on about five days annually with the greatest frequency of occurrence in January.

	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	41.8	25.1	33.5	75	26/1950	-7	29/1963	45.5	1950	22.9	1977	0.0	6.0	24.2	0.3
February	44.5	26.6	35.6	79	24/1985	-3	10/1979	44.0	1976	25.5	1979	0.0	3.5	21.2	0.1
March	53.5	33.8	43.6	89	30/1998	6	11/1960	49.9	1977	33.4	1960	0.0	0.5	14.2	0.0
April	65.0	43.2	54.1	94	23/1960	20	04/1965	59.6	1994	49.5	1966	0.4	0.0	2.8	0.0
May	74.3	52.7	63.5	98	19/1962	32	11/1966	70.5	1991	57.0	1967	1.5	0.0	0.0	0.0
June	83.2	62.1	72.7	101	15/1994	40	11/1972	78.8	2010	68.1	1972	6.3	0.0	0.0	0.0
July	87.4	67.1	77.3	105	06/2010	50	01/1988	81.5	2010	72.7	2000	11.5	0.0	0.0	0.0
August	85.6	65.8	75.7	105	20/1983	45	30/1986	80.1	1995	72.3	1992	8.0	0.0	0.0	0.0
September	78.6	58.4	68.5	100	11/1983	35	25/1963	73.7	1970	64.0	1963	2.8	0.0	0.0	0.0
October	67.6	46.4	57.0	94	09/2007	25	31/1966	63.8	1947	51.3	1988	0.1	0.0	1.4	0.0
November	56.3	37.0	46.7	86	01/1950	13	29/1955	52.3	1985	40.2	1996	0.0	0.1	10.4	0.0
December	45.4	28.5	36.9	77	29/1984	0	23/1960	44.1	1984	25.3	1989	0.0	3.1	21.2	0.0

Annual	65.3	45.6	55.4	105	19830820	-7	19630129	58.4	1949	53.2	1963	30.7	13.2	95.4	0.4

Winter	43.9	26.8	35.3	79	19850224	-7	19630129	41.0	1949	28.3	1963	0.0	12.6	66.5	0.4
Spring	64.2	43.2	53.7	98	19620519	6	19600311	58.2	1977	50.3	1984	2.0	0.5	17.0	0.0
Summer	85.4	65.0	75.2	105	19830820	40	19720611	79.2	2010	73.0	2000	25.8	0.0	0.0	0.0
Fall	67.5	47.3	57.4	100	19830911	13	19551129	61.3	1970	53.7	1976	2.9	0.1	11.8	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	3.13	7.84	1979	0.29	1955	2.51	07/1996	11	6	2	1	5.4	32.6	1996
February	2.93	7.16	1979	0.26	2009	3.26	11/1983	9	6	2	1	7.3	50.0	2010
March	3.81	8.64	1994	0.18	2006	2.56	23/2005	11	7	3	1	3.0	21.6	1960
April	3.25	8.15	1952	0.39	1985	2.52	15/2007	11	6	2	1	0.0	0.7	1985
May	3.80	8.71	1989	0.37	1986	3.28	08/1960	11	7	3	1	-	-	-
June	3.66	9.95	1972	0.15	1954	3.84	22/1972	10	6	2	1	-	-	-
July	3.95	8.77	2005	0.30	1955	5.85	08/1952	9	6	3	1	-	-	-
August	3.98	18.35	1955	0.77	1951	4.91	12/1955	9	6	3	1	-	-	-
September	3.75	11.50	1999	0.21	1967	6.02	30/2010	8	5	2	1	-	-	-
October	3.19	9.23	2005	0.00	1963	4.37	08/2005	8	5	2	1	0.0	0.3	1979
November	3.27	7.68	1952	0.31	1981	3.39	21/1952	9	6	2	1	0.7	8.4	1967
December	3.41	8.06	2009	0.20	1955	3.36	18/1977	10	6	3	1	3.5	23.8	1966

Annual	42.12	62.66	2003	27.89	1954	6.02	20100930	115	73	28	11	20.1	56.6	1966

Winter	9.46	19.63	1979	4.03	1977	3.36	19771218	29	18	7	2	16.3	77.0	2010
Spring	10.86	18.82	1983	3.97	1986	3.28	19600508	33	21	7	2	3.0	21.6	1960
Summer	11.58	25.38	1955	4.53	1966	5.85	19520708	29	19	8	3	-	-	-
Fall	10.21	19.56	2006	3.22	2001	6.02	20100930	25	16	7	3	0.7	8.4	1967

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