Climateby Month

Sister Bay, WI climate by month

NOAA 1991-2020 normals · 613 ft elevation

Sister Bay has mild summers and very cold and snowy winters. Highs peak at 76°F in July and fall to 26°F in January. Wet days are spread through the year, from about 8 to 12 a month. Normal snowfall is about 59 in a year. By our comfort score the best months are June, July and August.

Warmest month
76°F
July normal high
Coldest month
11°F
February normal low
Wet days a year
116
30.2 in of precipitation
Snow a year
58.8 in
normal snowfall

How warm is Sister Bay?

Normal highs range from 26°F in January to 76°F in July.

0°20°40°60°80° January: normal high 26°F (-3°C), low 11°F (-12°C) 26° 11° February: normal high 28°F (-2°C), low 11°F (-12°C) March: normal high 36°F (2°C), low 20°F (-7°C) April: normal high 47°F (8°C), low 30°F (-1°C) May: normal high 59°F (15°C), low 40°F (4°C) June: normal high 70°F (21°C), low 50°F (10°C) July: normal high 76°F (24°C), low 57°F (14°C) 76° 57° August: normal high 75°F (24°C), low 57°F (14°C) September: normal high 68°F (20°C), low 51°F (11°C) October: normal high 55°F (13°C), low 40°F (4°C) November: normal high 42°F (6°C), low 29°F (-2°C) December: normal high 32°F (0°C), low 19°F (-7°C) JFMAMJJASOND

Bars run from the normal low to the normal high for each month.

How rainy is Sister Bay?

October has the most wet days (about 12); the year brings about 30 in of precipitation.

January: 10 wet days February: 8 wet days 8 March: 8 wet days April: 10 wet days May: 11 wet days June: 10 wet days July: 10 wet days August: 9 wet days September: 10 wet days October: 12 wet days 12 November: 9 wet days December: 10 wet days JFMAMJJASOND

Wet day: at least 0.01 in of rain or melted snow, counted from daily records 1991-2020.

How much does it snow?

Normal snowfall is 58.8 in a year, most of it in January.

January: 15.0 in of snow 15.0 February: 13.0 in of snow March: 9.5 in of snow April: 5.7 in of snow May: 0.0 in of snow 0.0 June: 0.0 in of snow July: 0.0 in of snow August: 0.0 in of snow September: 0.0 in of snow October: 0.2 in of snow November: 3.4 in of snow December: 12.0 in of snow JFMAMJJASOND

How humid is Sister Bay?

Humidity data is not available for this location.

How much daylight?

Daylight ranges from about 8.8 hours in December to 15.6 hours in June.

January: 9.2 hours of daylight February: 10.4 hours of daylight March: 11.9 hours of daylight April: 13.5 hours of daylight May: 14.9 hours of daylight June: 15.6 hours of daylight 15.6 July: 15.2 hours of daylight August: 14.0 hours of daylight September: 12.5 hours of daylight October: 10.9 hours of daylight November: 9.6 hours of daylight December: 8.8 hours of daylight 8.8 JFMAMJJASOND
See all numbers
Monthly climate normals and day counts for Sister Bay, 1991-2020
MonthHighLowPrecip.Wet daysSnowDaylight
January 26°F11°F 1.6 in10 15.0 in 9.2 h
February 28°F11°F 1.1 in8 13.0 in 10.4 h
March 36°F20°F 1.7 in8 9.5 in 11.9 h
April 47°F30°F 2.9 in10 5.7 in 13.5 h
May 59°F40°F 3.0 in11 0.0 in 14.9 h
June 70°F50°F 3.1 in10 0.0 in 15.6 h
July 76°F57°F 2.8 in10 0.0 in 15.2 h
August 75°F57°F 3.0 in9 0.0 in 14.0 h
September 68°F51°F 3.2 in10 0.0 in 12.5 h
October 55°F40°F 3.6 in12 0.2 in 10.9 h
November 42°F29°F 2.3 in9 3.4 in 9.6 h
December 32°F19°F 1.8 in10 12.0 in 8.8 h

High and low: NOAA 1991-2020 normal daily high and low. Wet days: at least 0.01 in of rain or melted snow. Muggy days: daily mean dew point 65°F or higher.

Best months to visit Sister Bay

By our comfort score, the best months are June, July and August.

Comfort score by month (0-100) and its parts, in days per month
MonthScoreComfortableNotable rainHot or cold
Jan 220530
Feb 270426
Mar 350522
Apr 47177
May 64870
Jun 842260
Jul 862470
Aug 862660
Sep 741960
Oct 48371
Nov 340612
Dec 240527

Score = 40 × share of comfortable days + 25 × share of days without notable rain + 20 × share of days neither hot (90°F+) nor cold (high 40°F or below) + 15 × daylight. Comfortable days here are judged by temperature only (no humidity station nearby). How the score works.

Frost dates in Sister Bay

The last spring frost typically comes around May 14, and the first fall frost around Oct 18, leaving 155 frost-free days in a typical year.

Frost and freeze dates for Sister Bay
Typical date1 year in 10
Last spring frost (32°F)May 14after May 28
First fall frost (32°F)Oct 18before Oct 1
Last hard freeze (28°F)May 1after May 17
First hard freeze (28°F)Nov 1before Oct 15
Frost-free season155 daysunder 134 days

"Typical" is the date with a 50% chance of a later spring frost (or earlier fall frost). Planting after the "1 year in 10" spring date gives a 90% chance of no further frost. The Old Farmer's Almanac publishes 30% dates, which fall between our typical and 1-in-10 dates.

Station: Ephraim 1NE-Wwtp (USC00472626), NOAA 1991-2020 freeze probabilities. Frost dates for every city in Wisconsin.

Hottest and coldest readings, 1991-2020

The highest reading was 93°F (July 24, 2012); the lowest was -26°F (February 3, 1996).

From the temperature station's daily records with NOAA quality flags removed. Not an all-time record.

Near Sister Bay

Similar climates elsewhere

Where the numbers come from

  • Temperature, rain and snowfall: Washington Is (USC00478905), 16 mi NE of the city center, 686 ft (73 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Snow depth: Sturgeon Bay Exp Farm (USC00478267), 24 mi SSW of the city center, 699 ft (86 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Frost dates: Ephraim 1NE-Wwtp (USC00472626), 2.0 mi SW of the city center, 733 ft (120 ft higher than the city). NOAA normals and daily records, 1991-2020.
  • Not available for this location: humidity and wind by hour, cloud cover and daily humidity and wind (no station close enough or similar enough in elevation).

Distances from the city center (USGS). Methodology · Report an error