Weather in Saint Mary's County

Calculated from weather data of St. Mary's County Regional Airport (K2W6) between 2020 and 2024.

Maximum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	46.0	46.0	52.0	44.0	43.0
February	51.0	50.0	55.0	54.0	41.0
March	56.0	58.0	56.0	61.0	56.0
April	67.0	67.0	71.0	67.0	64.0
May	75.0		70.0	76.0	74.0
June	81.0		79.0	83.0	81.0	82.0
July	86.0		86.0	88.0	84.0	88.0
August	84.0		83.0	87.0	83.0	82.0
September	77.0		78.0	80.0	78.0	73.0
October	68.0		69.0	64.0	74.0	67.0
November	57.0		44.0	60.0	57.0	57.0
December	50.0		51.0	48.0	56.0	48.0
Average	63.0	55.0	68.0	68.0	67.0	70.0

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	32.0	33	38	30	31
February	35.0	34	37	35	31
March	38.0	40	38	42	37
April	47.0	49	49	47	47
May	57.0		52	58	56
June	64.0		60	65	65	66
July	70.0		69	72	67	72
August	69.0		68	70	70	68
September	62.0		62	62	62	60
October	49.0		56	47	58	40
November	39.0		39	43	39	33
December	35.0		35	34	40	34
Average	47.0	39.0	51.0	51.0	51.0	52.0

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Cold and hot days

Number of days	2024	2023	2022	2021	2020
86 °F or warmer	0	30	49	29	26
77 °F or warmer	5	106	135	103	76
68 °F or warmer	17	162	181	175	114
32 °F or colder	30	26	43	35	11

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	0.0	0	0	0	0
February	0.0	0	0	0	0
March	0.0	0	0	0	0
April	0.0	0	0	0	0
May	0.0		0	0	0
June	0.0		0	0	0	0
July	0.0		0	0	0	0
August	0.0		0	0	0	0
September	0.0		0	0	0	0
October	0.0		0	0	0	0
November	0.0		0	0	0	0
December	0.0		0	0	0	0
Average

Precipitation during daylight period

Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.

Wind speed (miles per hour)

Month	Average	2024	2023	2022	2021	2020
January	5.8	6	6	5	5
February	5.4	5	6	6	4
March	6.8	7	7	7	6
April	6.4	7	6	6	6
May	4.8		5	5	5
June	4.6		5	4	5	5
July	3.9		4	4	4	4
August	3.9		5	4	3	3
September	3.9		4	4	4	3
October	4.1		4	4	5	4
November	4.3		3	5	5	2
December	4.8		4	5	4	6
Average	5.0	6.0	4.9	4.9	4.7	3.8

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month	2024	2023	2022	2021	2020
January	W	W	W	W
February	SW	SW	SW	W
March	W	W	SW	W
April	SW	SW	W	W
May		NW	NE	SW
June		SW	SW	SW	S
July		S	SW	SW	SW
August		SW	SW	SW	S
September		NW	W	SW	N
October		W	NW	W	SW
November		N	W	W	S
December		W	W	SW	SW

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.

Saint Mary's County weather Q&A

What is the warmest month in Saint Mary's County?

The warmest month is July with an average temperature of 86 °F over the past years.

What is the coldest month in Saint Mary's County?

The coldest month is January with an average daytime temperature of 46 °F in the past few years.

Which month is the wettest in Saint Mary's County?

Chance of precipitation is the highest in January with a probability of around 0.0 %.

Which month is the driest in Saint Mary's County?

The least rainfall and snow can be expected in January. The probability is about 0.0 %.