Weather & Climate in Lyman, NE

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

Lyman experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 31°F in January while summers reach 74°F in July. The area gets 316 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 15.0 inches (drier than the 38-inch national average). The area receives 47.1 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 32. The city sits at an elevation of 4,050 feet.

Temperature

31°F Jan (-1°C) 74°F Jul (23°C)

Annual Average	49.8°F
	8% below US avg
January Average	31°F (-1°C)
July Average	74°F (23°C)
Sunny Days	316 days/yr

Geography

Elevation	4,050 ft (1,234 m)
Area	0.4 sq mi (1.0 km²)
Population Density	1,144/sq mi
Coordinates	41.9170°N, 104.0381°W
Timezone	America/Chicago
County	Laramie County County
Nearest Airport	Western Nebraska Regional/William B Heilig Field (BFF) 23 miles away

Precipitation & Snow

Annual Rainfall 15.0"

61% below US avg

Snowfall 47.1"

Wettest Month (May) 2.68"

Driest Month (Jan) 0.35"

Air Quality

AQI Median	32.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	76.7 / 100
Social Vulnerability	22.0 / 100
Community Resilience	49.0 / 100

Hazard Breakdown

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

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

Earthquake History

12 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.7.

Apr 9, 1996	34 km SW of Edgemont, South Dakota	M3.7	128 km	5 km
Dec 13, 1993	14 km SW of Esterbrook, Wyoming	M3.2	129 km	5 km
May 3, 1996	32 km SSW of Edgemont, South Dakota	M3.1	125 km	5 km
Jun 18, 1998	23 km S of Chadron, Nebraska	M3.1	116 km	5 km
Jan 6, 2018	7 km SW of Guernsey, Wyoming	M3.0	72 km	5 km
Nov 2, 1992	5 km ESE of Lusk, Wyoming	M3.0	96 km	5 km
Sep 7, 2019	23 km WSW of Esterbrook, Wyoming	M2.9	136 km	5 km
Mar 10, 2011	22 km N of Van Tassell, Wyoming	M2.9	105 km	5 km
Dec 19, 2013	33 km NE of Rock River, Wyoming	M2.8	135 km	12 km
Apr 24, 2007	23 km WSW of Hay Springs, Nebraska	M2.7	117 km	5 km
May 28, 2025	9 km ENE of Glendo, Wyoming	M2.6	100 km	5 km
Feb 27, 2021	13 km WNW of Crawford, Nebraska	M2.6	96 km	5 km

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

Tornado History

463 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 2 fatalities, 57 injuries.

Date	Rating	Distance	Path	Fatalities
Jun 27, 1955	EF4	20 km	26.0 mi	2
Jun 9, 1991	EF3	45 km	3.5 mi	0
May 27, 1985	EF3	37 km	48.0 mi	0
Jul 20, 1978	EF3	28 km	53.2 mi	0
Jun 20, 1960	EF3	81 km	26.1 mi	0
Jun 27, 1955	EF3	81 km	2.0 mi	0
Jun 26, 1955	EF3	24 km	2.0 mi	0
Jun 23, 2023	EF2	36 km	2.5 mi	0
Jun 23, 2023	EF2	24 km	4.7 mi	0
Jul 2, 2020	EF2	88 km	3.4 mi	0
Sep 10, 2019	EF2	62 km	19.1 mi	0
Jun 12, 2017	EF2	42 km	25.6 mi	0
Jun 12, 2017	EF2	59 km	31.7 mi	0
Jun 7, 2012	EF2	90 km	20.6 mi	0
May 18, 2010	EF2	87 km	1.5 mi	0
Jun 5, 2009	EF2	43 km	8.3 mi	0
Jun 27, 2005	EF2	47 km	17.0 mi	0
May 21, 1998	EF2	6 km	4.0 mi	0
Jul 6, 1994	EF2	90 km	6.0 mi	0
Jul 26, 1993	EF2	28 km	3.8 mi	0

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

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: FT.ROBINSON (46,887 acres, 1989).

Year	Name	Acres Burned	Distance
1989	FT.ROBINSON	46,887	93 km
2006	SIOUX COUNTY COMPLEX	39,567	93 km
2024	PLEASANT VALLEY	28,249	66 km
2006	OLD CHICAGO	25,218	79 km
2016	SIMMONS	20,950	43 km
2022	CARTER CANYON	15,828	27 km
2011	SQUAW MTN	14,379	99 km
1996	UNNAMED	14,279	46 km
2012	SAWMILL CANYON	13,438	89 km
2000	CO LINE	10,961	48 km
2006	TRAILER	8,040	99 km
2024	SCHIFF	6,714	68 km
2021	HACKBERRY CA	6,367	71 km
1999	UNNAMED	6,239	94 km
2021	POST CA	5,546	89 km
1996	SPRING CR.	4,682	83 km
1994	SQUAW MTN.	4,093	99 km
1988	UNNAMED	4,047	40 km
2022	SMOKEY	3,961	52 km
2012	COTTONWOOD	3,924	96 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	31°F (-1°C)	0.4 in	Driest
February	31°F (-1°C)	0.4 in
March	37°F (3°C)	0.9 in
April	46°F (8°C)	1.7 in
May	56°F (13°C)	2.7 in	Wettest
June	66°F (19°C)	2.3 in
July	74°F (23°C)	1.9 in	Warmest
August	70°F (21°C)	1.2 in
September	60°F (16°C)	1.2 in
October	48°F (9°C)	0.9 in
November	35°F (2°C)	0.6 in
December	27°F (-3°C)	0.4 in	Coldest

Lyman has a seasonal temperature swing of 47°F / from 27°F in December to 74°F in July. Total annual precipitation is 14.3 inches, with May being the wettest month (2.7") and January the driest (0.4").

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