Weather in Jefferson County

Calculated from weather data of Jefferson County International Airport (K0S9) between 2020 and 2024.

Maximum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	47.0	46.0	46.0	46.0	47.0	48.0
February	46.0	49.0	45.0	47.0	45.0	48.0
March	52.0	52.0	51.0	52.0	51.0	49.0
April	56.0		54.0	54.0	59.0	58.0
May	64.0		68.0	58.0	62.0	64.0
June	68.0		69.0	67.0	73.0	66.0
July	73.0		74.0	74.0	74.0	71.0
August	75.0		76.0	77.0	74.0	73.0
September	69.0		68.0	71.0	67.0	71.0
October	59.0		60.0	64.0	56.0	59.0
November	50.0		50.0	46.0	52.0	51.0
December	46.0		50.0	41.0	41.0	48.0
Average	58.0	49.0	59.0	59.0	59.0	59.0

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	35.0	34	35	35	37	37
February	33.0	37	33	34	34	34
March	35.0	37	33	38	35	34
April	39.0		39	37	38	39
May	46.0		48	44	44	46
June	50.0		48	50	53	50
July	51.0		50	53	52	51
August	52.0		54	53	53	51
September	49.0		49	49	49	50
October	41.0		43	43	42	44
November	37.0		37	33	41	37
December	35.0		40	32	33	35
Average	41.0	36.0	43.0	42.0	43.0	42.0

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	3	4	8	0
77 °F or warmer	0	22	26	20	15
68 °F or warmer	0	95	87	84	72
32 °F or colder	13	57	50	52	53

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	5.5	19	10	0	7	5
February	7.7	13	16	2	4	4
March	5.4	13	12	3	3	3
April	5.3		17	5	2	4
May	3.2		5	4	1	4
June	3.5		7	3	3	4
July	0.4		2	0	0	1
August	0.9		3	1	0	1
September	2.8		7	1	4	2
October	4.9		11	10	5	1
November	6.1		5	12	9	5
December	6.2		9	12	10	3
Average	5.3	15.0	8.5	3.8	3.4	2.9

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	5.7	6	6	5	6	7
February	5.3	6	5	5	6	5
March	5.9	7	6	6	7	5
April	6.6		7	8	5	6
May	5.3		5	6	6	5
June	5.3		5	5	6	5
July	4.7		5	4	5	5
August	5.0		5	5	5	5
September	5.3		6	6	6	5
October	5.3		5	5	6	5
November	5.4		5	5	7	6
December	4.5		5	5	5	5
Average	5.5	6.2	5.4	5.3	5.6	5.3

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

Prevailing wind direction

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

Jefferson County weather Q&A

What is the warmest month in Jefferson County?

The warmest month is August with an average temperature of 75 °F over the past years.

What is the coldest month in Jefferson County?

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

Which month is the wettest in Jefferson County?

Chance of precipitation is the highest in February with a probability of around 7.7 %.

Which month is the driest in Jefferson County?

The least rainfall and snow can be expected in July. The probability is about 0.4 %.