Weather in Franklin County

Calculated from weather data of Tri-Cities Airport (KPSC) between 2020 and 2024.

Maximum temperatures (°F)

Month	Average	2024	2023	2022	2021	2020
January	41.0	37.0	43.0	38.0	47.0	49.0
February	47.0	51.0	48.0	51.0	45.0	55.0
March	58.0	62.0	56.0	63.0	62.0	59.0
April	67.0		65.0	61.0	72.0	71.0
May	80.0		84.0	73.0	79.0	78.0
June	87.0		88.0	85.0	93.0	85.0
July	96.0		97.0	97.0	99.0	95.0
August	94.0		93.0	98.0	93.0	94.0
September	82.0		81.0	85.0	82.0	83.0
October	67.0		67.0	72.0	67.0	69.0
November	50.0		48.0	45.0	55.0	52.0
December	41.0		43.0	31.0	43.0	42.0
Average	65.0	50.0	68.0	68.0	70.0	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	29.0	27	28	27	32	35
February	28.0	34	28	27	29	31
March	34.0	34	33	40	34	35
April	41.0		40	38	39	40
May	50.0		54	50	48	50
June	56.0		56	57	60	56
July	60.0		60	62	63	59
August	60.0		61	62	60	59
September	52.0		53	54	51	52
October	41.0		42	44	43	42
November	34.0		33	30	40	34
December	31.0		35	21	31	31
Average	42.0	32.0	44.0	44.0	44.0	44.0

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	98	80	89	83
77 °F or warmer	2	142	129	137	137
68 °F or warmer	6	179	175	188	193
32 °F or colder	33	82	86	72	86

Precipitation (%)

Month	Average	2024	2023	2022	2021	2020
January	9.8	11	10	6	9	10
February	9.6	11	7	4	10	5
March	4.6	4	2	7	1	2
April	4.9		5	11	1	1
May	3.8		1	8	2	6
June	2.6		1	6	1	5
July	0.2		0	0	1	0
August	1.3		5	0	1	1
September	2.3		3	1	4	1
October	4.0		5	3	4	3
November	6.3		5	10	6	6
December	6.6		9	10	8	4
Average	4.9	8.5	4.2	5.2	3.5	3.6

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	5.7	6	4	4	5	9
February	8.0	7	9	6	11	7
March	7.7	7	8	7	7	9
April	9.0		8	9	9	8
May	7.3		7	8	8	9
June	7.3		6	8	7	8
July	5.7		6	5	6	6
August	5.8		7	6	6	5
September	6.2		7	6	6	6
October	6.4		5	6	7	8
November	6.6		6	6	8	9
December	5.2		4	4	9	5
Average	6.7	6.5	6.3	6.4	7.2	7.4

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

Franklin County weather Q&A

What is the warmest month in Franklin County?

The warmest month is July with an average temperature of 96 °F over the past years.

What is the coldest month in Franklin County?

The coldest month is December with an average daytime temperature of 41 °F in the past few years.

Which month is the wettest in Franklin County?

Chance of precipitation is the highest in January with a probability of around 9.8 %.

Which month is the driest in Franklin County?

The least rainfall and snow can be expected in July. The probability is about 0.3 %.