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Water temperature in Ontonagon (MI) in December

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Is it warm enough to swim in Ontonagon in December? Average water temperature in Ontonagon in December is 39°F and therefore is not suitable for comfortable swimming. The warmest water in Ontonagon in December is 43.7°F, and the coldest is 32.4°F. To find out the sea temperature today and in the coming days, go to Current sea temperature in Ontonagon

Changes water temperature in Ontonagon in December 2024, 2023

To get an accurate forecast for the water temperature in Ontonagon for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Ontonagon, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of December.

You can choose any other years:

Year 1:   Year 2:


Day 2024 2023 Min Max
December 142.4°F43.3°F39.9°F43.7°F
December 242.4°F42.8°F39.9°F43.7°F
December 342.3°F42.3°F39.6°F43.7°F
December 442.3°F42.1°F38.5°F43.7°F
December 542.1°F42.1°F38.7°F43.5°F
December 642.1°F42.4°F38.7°F42.6°F
December 741.7°F42.1°F38.5°F42.3°F
December 841.2°F42.3°F38.5°F42.3°F
December 940.8°F41.7°F38.3°F41.7°F
December 1040.5°F41.2°F37.9°F41.5°F
December 1140.1°F40.8°F37.8°F41.2°F
December 1239.7°F40.6°F37.9°F40.6°F
December 1339.6°F42.1°F36.9°F42.1°F
December 1439.4°F41.7°F36.7°F41.7°F
December 1539.4°F41.7°F36.3°F41.7°F
Day 2024 2023 Min Max
December 1639.4°F41.4°F35.4°F41.4°F
December 1739.2°F41.2°F35.6°F41.2°F
December 1839.2°F40.8°F35.6°F40.8°F
December 1939.2°F40.8°F35.8°F40.8°F
December 2039.2°F40.6°F35.6°F40.6°F
December 2138.7°F40.5°F35.1°F40.5°F
December 2238.5°F39.7°F36.3°F39.7°F
December 2338.1°F39.7°F35.8°F39.7°F
December 2437.6°F40.1°F34.5°F40.1°F
December 2537.4°F39.4°F33.3°F39.4°F
December 2638.1°F38.8°F33.4°F38.8°F
December 2737.6°F39.2°F33.1°F39.2°F
December 2837.6°F39.9°F33.4°F39.9°F
December 2937.8°F39.9°F33.8°F39.9°F
December 3037.8°F40.1°F33.3°F40.1°F
December 3137.9°F40.1°F32.4°F40.1°F
Ontonagon water temp chart in December

Average water temperature in Ontonagon in December over a decade

20152016201720182019
40.1°F39.9°F38.7°F38.7°F38.5°F
20202021202220232024
38.3°F40.3°F38.7°F41°F39.6°F

Ontonagon sea state in December

Chart comparing the height of waves in Ontonagon in December over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Waves height in Ontonagon in December

Ontonagon water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Where is the warm sea water in December?

Want to know where the water temperature in December is good for swimming? Select the continent of interest, the day of the month and the required water temperature

Region
Date (day and month)
Water temperature: min 60°F
 Average temperature  Maximum temperature

Temperature in neighboring cities

The nearest locations with the average water temperature in December. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

AvrMinMax
McLain State Park39.6°F35.2°F43.9°F
Calumet39.6°F35.4°F43.9°F
Keweenaw Bay39.7°F33.4°F44.6°F
Apostle Islands38.5°F33.6°F44.2°F
Eagle River39.7°F36°F43.5°F
Madeline Island38.1°F32.5°F44.1°F
Big Bay State Park38.1°F32.5°F44.1°F
Washburn37.9°F32.5°F43.9°F
Bayfield37.9°F32.5°F43.7°F
Eagle Harbor39.7°F35.8°F43.3°F

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[1] - The "Blue Flag" is awarded to beaches which fulfill a number of criteria, including: the quality of the bathing water, which must be in accordance with the relevant European Union Directive environmental education and information and beach area management and safety.

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Our report for Ontonagon is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

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