Weather in Gallatin County

Calculated from weather data of Bozeman Yellowstone International Airport (KBZN) between 2020 and 2024.

Maximum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	32.0	29.0	29.0	31.0	37.0	39.0
February	32.0	38.0	33.0	34.0	30.0	35.0
March	44.0	47.0	35.0	49.0	49.0	45.0
April	54.0		53.0	51.0	57.0	56.0
May	66.0		71.0	62.0	63.0	66.0
June	76.0		72.0	76.0	85.0	74.0
July	87.0		87.0	89.0	91.0	84.0
August	84.0		83.0	89.0	82.0	86.0
September	74.0		75.0	79.0	78.0	77.0
October	57.0		56.0	61.0	60.0	57.0
November	42.0		47.0	29.0	50.0	46.0
December	34.0		40.0	24.0	40.0	39.0
Average	55.0	38.0	57.0	57.0	60.0	58.0

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	12.0	6	10	10	17	22
February	11.0	19	11	11	8	15
March	22.0	24	16	26	25	24
April	29.0		28	26	28	29
May	40.0		44	38	37	41
June	47.0		48	46	49	47
July	52.0		51	53	55	50
August	51.0		53	54	49	51
September	43.0		45	46	41	40
October	31.0		32	34	35	28
November	21.0		24	9	28	20
December	14.0		17	4	16	17
Average	29.0	16.0	32.0	31.0	33.0	32.0

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	29	61	57	34
77 °F or warmer	0	80	91	99	91
68 °F or warmer	0	137	129	140	133
32 °F or colder	85	168	162	168	174

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	7.3	7	12	10	7	4
February	14.0	28	7	16	10	10
March	9.5	11	23	8	1	8
April	9.3		13	8	7	8
May	6.8		4	16	6	5
June	6.9		11	4	1	12
July	1.2		2	1	1	2
August	1.7		5	0	2	1
September	5.3		6	5	1	2
October	7.9		15	10	9	9
November	7.4		2	17	3	4
December	9.2		8	19	5	5
Average	7.8	15.3	8.8	8.7	4.1	5.6

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	4.0	3	3	4	4	6
February	5.4	5	6	5	6	5
March	5.8	5	4	7	6	8
April	7.1		7	9	7	7
May	6.1		6	7	6	7
June	5.9		5	7	6	6
July	5.3		5	6	5	5
August	5.2		6	5	6	5
September	5.1		5	4	6	6
October	5.4		4	4	6	6
November	4.9		4	5	7	5
December	4.3		3	4	9	4
Average	5.3	4.3	4.8	5.8	6.0	5.9

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

Prevailing wind direction

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

Gallatin County weather Q&A

What is the warmest month in Gallatin County?

The warmest month is July with an average temperature of 87 °F over the past years.

What is the coldest month in Gallatin County?

The coldest month is January with an average daytime temperature of 32 °F in the past few years.

Which month is the wettest in Gallatin County?

Chance of precipitation is the highest in February with a probability of around 14.1 %.

Which month is the driest in Gallatin County?

The least rainfall and snow can be expected in July. The probability is about 1.2 %.