Weather & Climate in Fort Supply, OK

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Fort Supply enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 34°F in January while summers reach 81°F in July. The area gets 323 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 25.2 inches (drier than the 38-inch national average). The area receives 12.4 inches of snow annually. Air quality is rated Good with a median AQI of 45. The city sits at an elevation of 2,006 feet.

Temperature

34°F Jan (1°C) 81°F Jul (27°C)

Annual Average	56.9°F
	5% above US avg
January Average	34°F (1°C)
July Average	81°F (27°C)
Sunny Days	323 days/yr

Geography

Elevation	2,006 ft (611 m)
Area	0.2 sq mi (0.6 km²)
Population Density	1,391/sq mi
Coordinates	36.5721°N, 99.5735°W
Timezone	America/Chicago
County	Harper County County
Nearest Airport	Elk City Regional Business (ELK) 79 miles away

Precipitation & Snow

Annual Rainfall 25.2"

34% below US avg

Snowfall 12.4"

Wettest Month (May) 3.58"

Driest Month (Jan) 0.59"

Air Quality

AQI Median	45.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	45.7 / 100
Social Vulnerability	77.5 / 100
Community Resilience	5.1 / 100

Hazard Breakdown

Tornado	Relatively Low
Hurricane	Very Low
Earthquake	Very Low
Wildfire	Relatively Low
Flood	Very Low
Hail	Relatively Low
Strong Wind	Relatively Low
Heat Wave	Very Low
Winter Weather	Very Low
Lightning	Very Low
Ice Storm	Very High
Drought	Relatively High
Cold Wave	Relatively Moderate
Landslide	Very Low

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

1,812 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.1.

Feb 13, 2016	18 km SE of Waynoka, Oklahoma	M5.1	78 km	8 km
Jan 7, 2016	16 km SE of Waynoka, Oklahoma	M4.7	76 km	4 km
Jul 20, 2015	7 km SSE of Byron, Oklahoma	M4.4	121 km	4 km
Jun 9, 2018	8 km E of Nescatunga, Oklahoma	M4.4	137 km	10 km
Jan 7, 2016	16 km SE of Waynoka, Oklahoma	M4.4	75 km	7 km
Jul 9, 2016	17 km SE of Waynoka, Oklahoma	M4.4	74 km	7 km
Jan 7, 2016	17 km SE of Waynoka, Oklahoma	M4.4	76 km	7 km
Jul 29, 2014	9 km E of Nescatunga, Oklahoma	M4.3	138 km	5 km
Feb 5, 2015	8 km NE of Cherokee, Oklahoma	M4.2	117 km	4 km
Feb 19, 2021	6 km SW of Manchester, Oklahoma	M4.2	139 km	7 km
Jul 8, 2016	17 km SE of Waynoka, OK	M4.2	75 km	6 km
May 13, 2017	17 km SE of Waynoka, Oklahoma	M4.2	76 km	5 km
Jul 8, 2016	17 km SE of Waynoka, Oklahoma	M4.2	75 km	7 km
Sep 15, 1995	7 km NNW of Alva, Oklahoma	M4.1	85 km	5 km
Jan 18, 2016	Oklahoma	M4.1	109 km	8 km
May 25, 2021	3 km WNW of Shattuck, Oklahoma	M4.1	44 km	8 km
Mar 24, 2015	11 km ENE of Nescatunga, Oklahoma	M4.0	140 km	7 km
Jan 6, 2016	16 km SE of Waynoka, Oklahoma	M4.0	76 km	9 km
Feb 13, 2016	16 km SE of Waynoka, Oklahoma	M4.0	75 km	5 km
May 23, 2015	6 km NNW of Sun City, Kansas	M4.0	110 km	5 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

508 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 19 fatalities, 130 injuries.

Date	Rating	Distance	Path	Fatalities
May 4, 2007	EF5	88 km	28.8 mi	11
May 23, 2019	EF3	50 km	15.7 mi	0
May 17, 2019	EF3	100 km	29.6 mi	0
Apr 14, 2012	EF3	54 km	34.0 mi	6
May 23, 2008	EF3	58 km	11.0 mi	0
May 23, 2008	EF3	87 km	20.9 mi	0
May 23, 2008	EF3	11 km	5.0 mi	0
Apr 17, 2002	EF3	69 km	8.0 mi	0
May 26, 1991	EF3	27 km	12.5 mi	0
May 15, 1991	EF3	37 km	11.5 mi	0
Mar 22, 1987	EF3	79 km	30.0 mi	0
Oct 31, 1984	EF3	65 km	20.0 mi	0
Apr 30, 1978	EF3	80 km	14.4 mi	0
Sep 25, 1973	EF3	74 km	5.7 mi	0
Sep 25, 1973	EF3	62 km	58.0 mi	0
Jul 15, 1963	EF3	96 km	0.1 mi	0
Jun 21, 1958	EF3	34 km	0.5 mi	0
Apr 2, 1956	EF3	82 km	20.0 mi	0
Nov 16, 2015	EF2	15 km	27.2 mi	0
Apr 30, 2012	EF2	69 km	2.6 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: OKS - STARBUCK (657,299 acres, 2017).

Year	Name	Acres Burned	Distance
2017	OKS - STARBUCK	657,299	63 km
2016	ANDERSON CREEK FIRE	374,523	89 km
2017	PERRYTON	290,211	96 km
2018	RHEA	277,949	81 km
1996	UNNAMED	88,943	73 km
2024	CATESBY FIRE	83,975	32 km
2017	OKS - 283	68,558	21 km
2016	350 COMPLEX	58,055	29 km
2018	34 COMPLEX	57,533	20 km
2017	OKS - SELMAN	44,767	21 km
2009	PUTNAM	42,995	88 km
2022	WASHITA RIVER FIRE	35,421	87 km
2009	CHESTER	34,432	72 km
2014	HIGGINS	28,466	76 km
2024	SLAPOUT FIRE	23,810	44 km
1996	UNNAMED	23,123	87 km
2011	LIPSCOMB COUNTY COMPLEX	23,028	81 km
2020	412 FIRE	22,069	90 km
2015	BOILING SPRINGS FIRE	20,264	29 km
2022	217	18,293	42 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	34°F (1°C)	0.6 in	Coldest, Driest
February	39°F (4°C)	1.0 in
March	47°F (8°C)	1.6 in
April	57°F (14°C)	2.0 in
May	66°F (19°C)	3.6 in	Wettest
June	76°F (24°C)	3.0 in
July	81°F (27°C)	2.4 in	Warmest
August	80°F (26°C)	2.8 in
September	71°F (22°C)	2.2 in
October	59°F (15°C)	1.7 in
November	45°F (7°C)	1.3 in
December	36°F (2°C)	0.8 in

Fort Supply has a seasonal temperature swing of 47°F / from 34°F in January to 81°F in July. Total annual precipitation is 22.9 inches, with May being the wettest month (3.6") and January the driest (0.6").

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