Data since 1918 have come from a designated set of gauges in each lake. This tells the true story of how the Great Lakes are getting warm.Surface water temperatures on the Great Lakes at 11:58 a.m., Monday, July 6, 2020Look at the very southern shore of Lake Michigan at Indiana, Saginaw Bay and the west end of Lake Erie. Average water temperature in lake Ontario in September is 20.2°C/68.4°F and therefore suitable for comfortable swimming. The long-term historical average water temperature is 48 degrees. This has been derived from analysis of two decades of oceanographic satellite measurements of nearby open water. Average August water temperature in Lake Simcoe is 22.5°C/72.5°F, the minimum temperature is 19.3°C/66.7°F, and the maximum is 25.1°C/77.2°F.

Water levels are recorded by gauges along the shore of each lake, some of which have been operated since the 1800s. At this time the average water temperature of the area is consistently above 62°F, so going for a swim will not require thermal wetsuits! Use the near real-time water temperature data with discretion, because they may contain errors. Effective on May 20, 2020 beginning at 18z Coordinated Universal Time (UTC), two major changes for NOS OFS datasets on THREDDS will be implemented. Register Alert * Buoy alert notifications will remain active for 2018 National Data Buoy Center - Recent observations from buoy 45012 (43.621N 77.401W) - EAST Lake Ontario - 20NM North Northeast of Rochester, NY. This indicator measures water levels and surface water temperatures in the Great Lakes. “[E]very Great Lake has warmed at least 1.5F since 1995 (when data became available for all lakes), led by Lake Ontario at 2.2F,” The most important news stories of the day, curated by Post editors and delivered every morning.The most important news stories of the day, curated by Post editors and delivered every morning.Lake Michigan’s average water temperature reached 75.1 degrees on July 8, nearly 11 degrees above normal, and the warmest mark on record so early in the year. File structure changes - To improve THREDDS performance related to file access and data aggregation All model nowcast and forecast information is based on a hydrodynamic Pre-1918 data came from one water level gauge per lake. During those months, Lake Simcoe water temperature does not drop below 20°C/68°F and therefore suitable for comfortable swimming. This Web page contains links to a number of official Web sites containing Great Lakes water level and related data. We have calculated the average water temperature variation around the year as well as the extremes that have been observed on each date. Great Lakes Marine Weather Portal - Includes point forecasts. Each chart is for a specific Great Lake.Lake Michigan average water temperature this year (red) versus long-term average.Lake Michigan’s average surface water temperature has gone nearly vertical on the temperature chart(red line) in the past week or so. Lake Ontario is … Please see the Service Change Notice for details

Water Temperature Nowcast This near surface water temperature animation was created from the latest LOOFS nowcast for the Lake Ontario. Lake Erie’s average water temperature reached 79.6 degrees on July 10, over 8 degrees above normal, and the warmest mark on record for any month (although it … Hot weather and light winds have rapidly warmed the surface waters on the Great Lakes. Over lakes Erie and Ontario, the water is the warmest it has been since records began being kept, and could warm more in the coming weeks.The abnormally warm waters, consistent with climate-change trends in recent decades, could compromise water quality and harm marine life in some areas.Surface water temperatures averaged over all of the Great Lakes, except the deep and choppy Lake Superior, have risen well into the 70s while Lake Erie has flirted with 80 degrees. Lake Michigan now averages 74 degrees on the surface, which is 11 degrees warmer than the historical average water temperature on this date.Lake Huron average water temperature this year (red) versus long-term average.Lake Huron is eight degrees warmer than average at 69 degrees.Lake Erie average water temperature this year (red) versus long-term average.Lake Erie now is only four degrees from averaging 80 degrees.

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