Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Sister Bay has a cool climate with an average annual temperature of 45°F (7°C). Winters average 19°F in January while summers reach 69°F in July. The area gets 270 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 31.0 inches. The area receives 61.6 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 716 feet.
Temperature
19°F Jan (-7°C)69°F Jul (20°C)
Annual Average
44.7°F
17% below US avg
January Average
19°F (-7°C)
July Average
69°F (20°C)
Sunny Days
270 days/yr
Geography
Elevation
716 ft (218 m)
Area
3.6 sq mi (9.2 km²)
Population Density
381/sq mi
Coordinates
45.1871°N, 87.1294°W
Timezone
America/Chicago
County
Door County County
Nearest Airport
Menominee Regional (MNM) 25 miles away
Precipitation & Snow
Annual Rainfall31.0"
18% below US avg
Snowfall61.6"
Wettest Month (Sep)3.43"
Driest Month (Feb)0.98"
Air Quality
AQI Median
38.0
Rating
Good
Natural Hazard Risk
Overall Risk
Relatively Low
Risk Score
46.9 / 100
Social Vulnerability
45.3 / 100
Community Resilience
99.8 / 100
Hazard Breakdown
Tornado
Relatively Low
Hurricane
No Rating
Earthquake
Very Low
Wildfire
Very Low
Flood
Relatively Low
Hail
Relatively Low
Strong Wind
Relatively Low
Heat Wave
Very Low
Winter Weather
Relatively Low
Lightning
Relatively Low
Ice Storm
Relatively Low
Drought
No Rating
Cold Wave
Relatively Moderate
Landslide
Very Low
Coastal Flood
Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990.
Strongest on record: M2.9.
Aug 2, 2024
38 km ESE of Sturgeon Bay, Wisconsin
M2.9
59 km
11 km
Jan 7, 2024
3 km NE of Mole Lake, Wisconsin
M2.5
147 km
5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
77 tornadoes (EF0+) recorded within 100 km since 1950.
Strongest on record: EF4. Total: 4 fatalities, 27 injuries.
Date
Rating
Distance
Path
Fatalities
Aug 19, 1968
EF4
76 km
21.8 mi
2
Aug 23, 1998
EF3
24 km
5.1 mi
0
May 28, 1991
EF3
57 km
10.0 mi
0
Jul 11, 1987
EF3
87 km
71.0 mi
0
Jul 4, 1986
EF3
91 km
24.3 mi
0
Jun 15, 2022
EF2
93 km
1.9 mi
0
Jul 19, 1992
EF2
74 km
0.2 mi
0
May 28, 1991
EF2
76 km
12.0 mi
0
Jun 8, 1985
EF2
51 km
5.0 mi
0
Jun 16, 1979
EF2
98 km
15.2 mi
0
Apr 21, 1974
EF2
74 km
2.7 mi
0
Jul 20, 1972
EF2
98 km
0.8 mi
0
Apr 22, 1970
EF2
78 km
11.2 mi
0
Apr 22, 1970
EF2
70 km
9.5 mi
0
Jun 4, 1966
EF2
98 km
4.9 mi
0
Jun 4, 1966
EF2
100 km
5.4 mi
0
Jun 4, 1966
EF2
98 km
4.7 mi
0
Jun 9, 1964
EF2
73 km
3.0 mi
0
Jul 8, 1959
EF2
95 km
1.0 mi
0
May 17, 1958
EF2
71 km
4.7 mi
0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
3 wildfires (100+ acres) recorded within 100 km.
Largest: 21-SLBE LASSO LOOP BURN (1,906 acres, 2021).
Year
Name
Acres Burned
Distance
2021
21-SLBE LASSO LOOP BURN
1,906
96 km
2019
19-SLBE PETERSON
605
97 km
2019
DUTCH MILL
551
96 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
Month
Avg Temperature
Precipitation
Summary
January
19°F (-7°C)
1.5 in
Coldest
February
21°F (-6°C)
1.0 in
Driest
March
30°F (-1°C)
1.7 in
April
40°F (5°C)
2.3 in
May
52°F (11°C)
2.9 in
June
61°F (16°C)
3.4 in
July
69°F (20°C)
3.0 in
Warmest
August
67°F (19°C)
3.4 in
September
59°F (15°C)
3.4 in
Wettest
October
49°F (9°C)
2.6 in
November
37°F (3°C)
2.4 in
December
26°F (-3°C)
1.7 in
Sister Bay has a seasonal temperature swing of 49°F / from 19°F in January to 69°F in July. Total annual precipitation is 29.2 inches, with September being the wettest month (3.4") and February the driest (1.0").
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