Weather in Coos County

Calculated from weather data of Mount Washington Weather Station (KMWN) between 2020 and 2024.

Maximum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	15.0	18.0	23.0	11.0	14.0	17.0
February	15.0	20.0	17.0	17.0	10.0	14.0
March	19.0	26.0	21.0	22.0	20.0	20.0
April	29.0		35.0	30.0	29.0	23.0
May	42.0		41.0	47.0	40.0	39.0
June	49.0		50.0	49.0	51.0	50.0
July	55.0		57.0	56.0	51.0	56.0
August	53.0		51.0	56.0	55.0	52.0
September	48.0		52.0	48.0	47.0	47.0
October	39.0		39.0	43.0	41.0	35.0
November	25.0		23.0	30.0	23.0	29.0
December	19.0		26.0	21.0	20.0	20.0
Average	32.0	21.0	36.0	36.0	34.0	34.0

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	5.0	6	10	-5	8	11
February	3.0	6	1	-1	3	4
March	9.0	14	8	7	11	13
April	20.0		21	18	22	17
May	32.0		30	35	32	31
June	42.0		41	39	45	44
July	48.0		49	46	46	51
August	46.0		42	48	51	45
September	41.0		42	38	41	40
October	32.0		32	33	36	29
November	15.0		11	18	15	22
December	9.0		15	9	9	11
Average	23.0	9.0	25.0	24.0	27.0	27.0

67th lowest temperature of United States

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	0	0	0	0
77 °F or warmer	0	0	0	0	0
68 °F or warmer	0	0	0	0	0
32 °F or colder	87	216	191	192	204

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	30.8	30	34	29	33	22
February	27.7	29	23	26	40	43
March	33.3	37	31	36	26	27
April	31.4		28	34	42	35
May	16.2		17	14	21	16
June	22.0		33	15	16	15
July	13.6		19	8	29	9
August	14.8		23	13	21	7
September	15.1		17	19	16	9
October	25.6		30	15	23	32
November	29.4		27	23	30	36
December	34.7		32	37	33	25
Average	24.3	32.2	25.7	20.7	26.1	21.0

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	40.7	37	37	44	39	45
February	44.7	39	47	44	39	50
March	41.9	42	39	43	51	37
April	37.4		37	39	32	39
May	31.2		35	27	32	33
June	26.4		19	29	35	22
July	25.3		21	30	25	27
August	25.6		29	22	22	32
September	24.7		20	27	31	31
October	30.9		30	25	27	36
November	42.4		41	44	39	47
December	41.4		36	44	48	40
Average	34.7	39.6	31.7	33.4	33.3	35.5

1st highest wind speed of United States

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	NW	W
February	NW	W	W	W	W
March	W	NW	W	W	W
April		W	W	NW	W
May		NW	W	NW	W
June		N	W	W	W
July		W	W	W	W
August		W	W	W	W
September		NW	W	W	W
October		W	SW	NW	W
November		W	W	W	W
December		W	NW	W	W

Prevailing wind direction

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

Coos County weather Q&A

What is the warmest month in Coos County?

The warmest month is July with an average temperature of 55 °F over the past years.

What is the coldest month in Coos County?

The coldest month is January with an average daytime temperature of 15 °F in the past few years.

Which month is the wettest in Coos County?

Chance of precipitation is the highest in December with a probability of around 34.7 %.

Which month is the driest in Coos County?

The least rainfall and snow can be expected in July. The probability is about 13.7 %.