Why use this site?
It's run locally for visitors and residents of Marquette, Michigan. You'll receive accurate, real-time weather for the city.
Speed! Our server is in Michigan, and our pages consume very little data.
We have no ads or external tracking scripts that collect or sell your activity.
This site is will run on any modern device (fully responsive) and a host of older ones too.
Exclusive features include: real-time conditions, multiple radar views, city normals/records, snowfall totals, user-configurable pressure, and keyboard navigation.
Current conditions are measured approximately 1/4 mile south of downtown Marquette. Wind is sampled 28ft above ground level (AGL) and temperature/humidity at 5ft AGL. Our measurement location is typical of the city and yet provides a relatively open exposure to the prevailing winds.
We use the Sensirion SHT31 sensor suite inside a Davis VP2 24-hour fan-aspirated radiation shield. We replaced the DC stock fan with a durable AC-powered fan that moves more air through the sensor chamber (24 CFM or 2.25 m/s linearly). This minimizes radiation errors and ensures the quickest sensor response time.
Temperatures are within +/- 0.5°F.
Humidity is usually within +/- 2%.
[Humidity Disclosure: Due to a known defect, the humidity sensor has an effective ceiling of 97% to which we add 3%. To attempt to preserve continuity in measurements we also add 1% to 96%. These offsets were selected after considerable testing and should be accurate to within 3%. Because humidity is averaged over 5 minutes, you may see values besides 95%, 97% and 100% when humidity fluctuates.
Pressure is at most +/- 0.03" but typically within 0.01" of mercury.
[NOTE: If you have an analog barometer (usually a dial display) or a smartphone barometer app you're trying to calibrate, go into Settings on the home page and switch the "Pressure Formula" to "Altimeter".]
Wind speed is within +/- 2mph or 5%, whichever is greater. Wind direction should be within 3 degrees assuming no obstructions (the biggest of which is 40ft away to the NNE).
[Wind Disclosure: In order to capture forecasted wind speeds, we estimate at least a 70ft tower would be required to rise above the "urban canopy". Our anemometer is 28ft high, same as the Coast Guard. We ran a series of logarithmic calculations and found that sustained wind speeds can be very roughly "corrected" by multiplying by 1.4. Wind gusts cannot be corrected.]
Windy conditions can result in significant real-time rain measurement errors (>20-30%). In that event, we correct the next day with measurements from our offline CoCoRaHS gauge (check the Weather History page). Usually rain totals between the two gauges are very close.
Snow is measured manually up to four times a day during the snow season using two 16"x16" snow boards at ground level and published in the Almanac section of the home page (past measurements available on the Weather History page).
Routine checks and calibrations are performed using a variety of calibrated instruments as well as comparisons to forecasts and nearby weather stations to be sure all sensors are operating optimally.
Conditions are pushed to your device every 60 seconds although you can adjust the interval to your liking (from 3 seconds to 10 minutes). The home page reloads automatically every 10 minutes to grab the latest forecast and almanac (unless you disable reloads in page settings -- see upper right of home page). If you leave the home page open but minimize it or select a different tab, when you return -- assuming more than 10 minutes has passed -- a complete refresh will occur. Otherwise, only the conditions will update. Alerts from the National Weather Service are updated every 60 seconds and when present appear on the Home and Area pages. The Weather History page is updated every 5 minutes (no auto refresh). The temps and forecast on the Area page are updated every 10 minutes (no auto refresh).
The National Weather Service provides us a grid forecast covering a portion of the city. Due to Marquette's varying elevation and lake exposure we cannot guarantee this forecast will equally apply to all areas. However, we have found it to be a good, general forecast for most neighborhoods within the city limits. Be aware that within 1-2 blocks of the lakeshore, particularly around McCarty's Cove, the lake's influence is strongest (moderating temperatures, raising humidity).
We track the accuracy of temperature forecasts appearing on the home page. We have found that around 2/3rds of the time the same day and next day forecasts are within 3F of reality. When the weather starts changing -- spring especially and autumn -- the accuracy tends to decline. When patterns stabilize in the winter and summer, accuracy improves. This is generally true of any location in temperate latitudes, but particularly true next to Lake Superior.
Marquette's Unique Climate
Other sites use the NWS records measured in Negaunee Township (old county airport location) which begin in the 1960s. We are the only website to use Marquette city records (going back to 1871) in our almanac section. Why is this important? Marquette has an average annual temperature (43.2) that's closer to Traverse City (45.4) than Negaunee (40.1). We are also in a USDA plant hardiness zone (5b) shared with Milwaukee and Lansing. Simply put, it's different here!
In the winter, lake-effect snow increases as you rise in elevation. A 750 foot gain between the city lakeshore and the National Weather Service forecast office, for example, is the difference between approximately 120 inches of snow (Marquette) and 200+ inches of snow (Negaunee) on average annually. Just for reference, 80 inches is an entire winter's worth of snow in Grand Rapids, MI!
The city also features a "heat island" (due to its concentration of buildings & concrete which absorb and release heat). In the summer, when winds are from the south or west, it can be noticably hotter in the city than interior U.P. communities. If winds come off the lake the opposite can happen, Marquette can be significantly cooler than surrounding areas.
For weather in Marquette County and beyond, see our area page where you can compare temperatures and get the regional outlook.
There are three radar options to choose from on our home page. The default image is provided by the National Weather Service. The NWS radar uses very little data, and yet it's very sensitive. A rule of thumb is that it takes about 20 dbZ (light green) for precipitation to occur. Other colors can show fog, drizzle, smoke, etc. "Dark Sky" is the most interactive option, but it also uses the most data (4MB per page load). The Weather Underground radar excels at color coding precipitation: snow is blue, freezing rain is pinkish and rain is green. It's also low bandwidth, but not as sensitive as the NWS radar.
This website's blue-aqua color scheme attempts to evoke Marquette's environment particularly the interplay of the sky and the water. Shades of gray represent cloudy skies and the warm tones suggest sandy earth and sunshine. The objective was to mimic a good painting which appears to change according to the light.
This site is designed to perform well with mobile and desktop versions of Chrome, Safari, Firefox, Opera, Edge and Internet Explorer released within the last 5 years. If you are using older software, the site will either "gracefully degrade" (content remains readable but certain features are inactive) or completely breakdown (ancient browsers will do that!). Beware that outdated browsing software is a gateway for hackers to gain control of your computing device.
We feed conditions to the following organizations: CWOP (ID: EW7933) & Weather Underground.
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This website is intended for informational purposes only. It is not affiliated with the City of Marquette municipal government. Current & past conditions are provided by our privately operated weather station. All official weather records for Marquette, MI, are recorded by COOP station MRQM4 at the Waste Water Treatment Plant on Lakeshore Dr & Ridge St. For decisions regarding the preservation of life or property, please visit the National Weather Service Marquette or tune into local radio and television stations which are required, by law, to alert the public in the event of an emergency.
Questions? Comments? Please contact us.