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Average Weather in Rockford Michigan, United States

In Rockford, the summers are long, warm, and partly cloudy and the winters are freezing, dry, windy, and mostly cloudy. Over the course of the year, the temperature typically varies from 17°F to 82°F and is rarely below 1°F or above 90°F.

The warm season lasts for 3.9 months, from May 21 to September 17, with an average daily high temperature above 71°F. The hottest day of the year is July 19, with an average high of 82°F and low of 62°F.

The cold season lasts for 3.4 months, from November 30 to March 10, with an average daily high temperature below 40°F. The coldest day of the year is January 29, with an average low of 17°F and high of 29°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature

Average Hourly Temperature in Rockford12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecfreezingchillycoldcoolcomfortablewarm
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Clouds

In Rockford, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Rockford begins around May 16 and lasts for 5.6 months, ending around November 5. On August 7, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 67% of the time, and overcast or mostly cloudy 33% of the time.

The cloudier part of the year begins around November 5 and lasts for 6.4 months, ending around May 16. On January 8, the cloudiest day of the year, the sky is overcast or mostly cloudy 69% of the time, and clear, mostly clear, or partly cloudy 31% of the time.

Cloud Cover

Cloud Cover in Rockfordclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 869%Jan 869%Aug 733%Aug 733%May 1651%May 1651%Nov 551%Nov 551%overcastmostly cloudypartly cloudymostly clearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Rockford varies throughout the year.

The wetter season lasts 7.4 months, from April 3 to November 16, with a greater than 25% chance of a given day being a wet day. The chance of a wet day peaks at 33% on June 13.

The drier season lasts 4.6 months, from November 16 to April 3. The smallest chance of a wet day is 18% on February 4.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in Rockford changes throughout the year.

Rain alone is the most common for 9.8 months, from February 21 to December 16. The highest chance of a day with rain alone is 33% on June 13.

Snow alone is the most common for 2.2 months, from December 16 to February 21. The highest chance of a day with snow alone is 12% on January 14.

Daily Chance of Precipitation

Daily Chance of Precipitation in Rockfordsnowrain0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJun 1333%Jun 1333%Feb 418%Feb 418%Dec 1622%Dec 1622%Apr 325%Apr 325%Nov 1626%Nov 1626%snowrain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Rockford experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Rockford. The most rain falls during the 31 days centered around September 22, with an average total accumulation of 3.2 inches.

The least rain falls around January 27, with an average total accumulation of 0.6 inches.

Average Monthly Rainfall

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Rockford experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 5.2 months, from November 4 to April 11, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 8, with an average total liquid-equivalent accumulation of 0.7 inches.

The snowless period of the year lasts for 6.8 months, from April 11 to November 4. The least snow falls around July 19, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in Rockfordsnowsnow0.0 in0.5 in1.0 in1.5 in2.0 in2.5 in3.0 in3.5 inJanFebMarAprMayJunJulAugSepOctNovDecJan 80.7 inJan 80.7 inJul 190.0 inJul 190.0 inNov 40.1 inNov 40.1 inApr 110.1 inApr 110.1 in
The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day in Rockford varies significantly over the course of the year. In 2017, the shortest day is December 21, with 8 hours, 59 minutes of daylight; the longest day is June 21, with 15 hours, 23 minutes of daylight.

Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 6:02 AM on June 15, and the latest sunrise is 2 hours, 19 minutes later at 8:21 AM on November 4. The earliest sunset is at 5:07 PM on December 7, and the latest sunset is 4 hours, 19 minutes later at 9:25 PM on June 26.

Daylight saving time (DST) is observed in Rockford during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

Sunrise & Sunset with Twilight and Daylight Saving Time in Rockford2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 156:02 AMJun 156:02 AM9:25 PMJun 269:25 PMJun 26Dec 75:07 PMDec 75:07 PM8:21 AMNov 48:21 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnight
The solar day over the course of the year 2017. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Rockford experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.6 months, from May 31 to September 19, during which time the comfort level is muggy, oppressive, or miserable at least 8% of the time. The muggiest day of the year is July 28, with muggy conditions 33% of the time.

The least muggy day of the year is February 16, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in Rockfordmuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 160%Feb 160%Jul 2833%Jul 2833%May 319%May 319%Sep 198%Sep 198%muggymuggyhumidhumidcomfortablecomfortabledrydrymiserablemiserable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Rockford experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 7.6 months, from October 2 to May 20, with average wind speeds of more than 5.4 miles per hour. The windiest day of the year is January 12, with an average hourly wind speed of 6.6 miles per hour.

The calmer time of year lasts for 4.4 months, from May 20 to October 2. The calmest day of the year is August 3, with an average hourly wind speed of 4.2 miles per hour.

Average Wind Speed

Average Wind Speed in Rockfordwindywindy0 mph1 mph2 mph3 mph4 mph5 mph6 mph7 mph8 mph9 mph10 mph11 mphJanFebMarAprMayJunJulAugSepOctNovDecJan 126.6 mphJan 126.6 mphAug 34.2 mphAug 34.2 mphOct 25.4 mphOct 25.4 mphMay 205.4 mphMay 205.4 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Rockford is from the west throughout the year.

Wind Direction

Wind Direction in Rockford0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestsoutheastnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Rockford is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.7 months, from July 5 to September 26, with an average temperature above 63°F. The day of the year with the warmest water is August 13, with an average temperature of 71°F.

The time of year with cooler water lasts for 5.0 months, from December 17 to May 16, with an average temperature below 43°F. The day of the year with the coolest water is March 5, with an average temperature of 35°F.

Average Water Temperature

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.5 months, from May 4 to August 18, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is July 1, with an average of 7.1 kWh.

The darker period of the year lasts for 3.5 months, from October 31 to February 14, with an average daily incident shortwave energy per square meter below 2.5 kWh. The darkest day of the year is December 22, with an average of 1.3 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Rockford are 43.120 deg latitude, -85.560 deg longitude, and 807 ft elevation.

The topography within 2 miles of Rockford contains only modest variations in elevation, with a maximum elevation change of 276 feet and an average elevation above sea level of 790 feet. Within 10 miles also contains only modest variations in elevation (423 feet). Within 50 miles contains only modest variations in elevation (787 feet).

The area within 2 miles of Rockford is covered by trees (53%), artificial surfaces (35%), and cropland (12%), within 10 miles by cropland (41%) and trees (37%), and within 50 miles by cropland (49%) and trees (32%).

Data Sources

This report illustrates the typical weather in Rockford, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Rockford.

For each station, the records are corrected for the elevation difference between that station and Rockford according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Rockford is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Rockford and a given station.

The stations contributing to this reconstruction are: Gerald R. Ford International Airport (46%, 27 kilometers, south); Fremont Municipal Airport (18%, 50 kilometers, northwest); Muskegon County Airport (15%, 55 kilometers, west); Roben-Hood Airport (11%, 67 kilometers, north); and Gratiot Community Airport (10%, 74 kilometers, east).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.