Rockford, Illinois, experiences a diverse range of weather throughout the year.
The warm season lasts about 4 months, from May 20 to September 19, with daily high temperatures above 73°F.
July stands out as the hottest month, averaging highs of 83°F and lows of 64°F.
During the colder months, Rockford transforms.
From November 30 to March 2, the daily high temperatures are typically below 40°F. The coldest period revolves around January, with record lows reaching around 15°F.
Rainfall and precipitation levels vary, shaping a climate that balances between distinct warm and cold seasons.
For more detailed data, including monthly temperature averages and climate graphs, check this climate Rockford data.
Average Temperature in Rockford, Illinois
In Rockford, Illinois, the temperatures vary greatly throughout the year.
January is the coldest month. The average low is 15ºF, and the high is 30ºF.
During February, temperatures slightly increase, with lows around 18ºF and highs near 34ºF.
As spring approaches, March sees average temperatures ranging from 26ºF to 45ºF.
April brings milder weather, with temperatures between 37ºF and 59ºF.
By May, the temperature ranges from 48ºF to 71ºF.
June marks the beginning of summer, with temperatures between 58ºF and 81ºF.
July and August are the hottest months, with July being the warmest month.
Temperatures usually range from 63ºF to 84ºF in both months, occasionally reaching higher maximum temperatures.
As autumn arrives in September, temperatures start to cool down, ranging from an average low of 54ºF to a high of 75ºF.
October experiences a further drop, with lows around 42ºF and highs near 61ºF.
In November, temperatures continue to fall, with averages between 30ºF and 45ºF.
By December, the cold sets in, with lows around 19ºF and highs about 33ºF.
Average Monthly Temperatures in Rockford:
| Month | Average Low (ºF) | Average High (ºF) |
|---|---|---|
| January | 15 | 30 |
| February | 18 | 34 |
| March | 26 | 45 |
| April | 37 | 59 |
| May | 48 | 71 |
| June | 58 | 81 |
| July | 63 | 84 |
| August | 63 | 84 |
| September | 54 | 75 |
| October | 42 | 61 |
| November | 30 | 45 |
| December | 19 | 33 |
For more details on temperature trends, check out articles on temperature.
Average Precipitation in Rockford, Illinois
Rockford experiences varying levels of rainfall and snowfall throughout the year. The distribution of wet and snowy days gives a comprehensive view of the climate.
Average Rainfall in Rockford, Illinois
Rainfall in Rockford is spread throughout the year. The city receives about 36 inches of rain annually.
April and May are typically the wettest months, with nearly 4 inches of rainfall each.
Summers are wet as well, but the rain is often in the form of short, intense thunderstorms.
Fall months witness decreasing rainfall, with November seeing around 2 inches.
Winter months receive the least rain, averaging less than 2 inches in both December and January.
Average Snow in Rockford, Illinois
Rockford sees significant snowfall during winter. The city averages about 36 inches of snow annually, with December, January, and February being the snowiest months.
January typically receives the most snow, averaging nearly 10 inches.
Snow and ice are common in winter, contributing to several snowy days.
March starts to see a decline in snowfall, with May usually snow-free.
Snowfall patterns create challenging conditions for commuting and outdoor activities, particularly during peak winter months.
Average Sun in Rockford, Illinois
Rockford experiences varying levels of sunlight throughout the year, impacting daily life and activities. Key factors include the amount of solar energy received and changes in daylight.
Average Daily Shortwave Solar Energy in Rockford, Illinois
Sunlight is measured using shortwave solar energy, which varies by season.
Rockford typically experiences the highest levels of solar energy in June, coinciding with the longest days of the year. This peak period averages around 15 hours of daylight.
Conversely, January has the shortest days with roughly 4.6 hours of daily sunshine.
This reduction in sunlight during winter often results in more overcast days.
Rockford accumulates a yearly average of 2809.98 hours of sunlight.
Despite these fluctuations, summer remains the sunniest season, providing ample sunshine for outdoor activities.
Dust and clouds can influence daily sunlight levels, reflecting seasonal changes. More details can be found here.
Average Humidity in Rockford, Illinois
The average humidity in Rockford, Illinois, varies throughout the year. Humidity is measured as a percentage and shows how much moisture is in the air.
During the warm months from May to September, humidity levels are typically high. This can make the temperatures feel warmer.
For example, in July, the humidity averages around 70%.
In the colder months from November to March, humidity levels drop. Lower temperatures mean the air holds less moisture.
The dew point is another way to measure moisture in the air. It indicates the temperature at which dew forms.
In Rockford, the average dew point varies with the seasons, similar to humidity levels.
For a clearer understanding, here’s a simple table showing monthly average humidity and dew point:
| Month | Average Humidity | Average Dew Point |
|---|---|---|
| January | 75% | 15°F |
| April | 65% | 38°F |
| July | 70% | 64°F |
| October | 68% | 45°F |
Humidity and dew point can affect how comfortable the air feels. Higher humidity during summer can make it feel muggy, while lower humidity in winter can feel drier.
Average Wind in Rockford, Illinois
In Rockford, Illinois, wind is a common feature of the climate throughout the year. The city experiences varying wind speeds depending on the season.
The average wind speed in Rockford is around 14 mph. This can fluctuate with weather systems.
Monthly Average Wind Speeds:
- January: 14 mph
- February: 14 mph
- March: 13 mph
- April: 13 mph
- May: 11 mph
- June: 10 mph
- July: 9 mph
- August: 9 mph
- September: 10 mph
- October: 12 mph
- November: 13 mph
- December: 13 mph
Spring and fall often bring slightly stronger winds due to changing weather patterns.
Windiest Month: January stands out as the windiest month, with average wind speeds reaching 14 mph.
Least Windy Month: Both July and August have the lowest average wind speeds at about 9 mph.
Wind direction in Rockford typically comes from the west and southwest, which is consistent with many regions in the Midwest.
For more information about how wind influences the climate, check out related articles on wind.
Average Air Quality in Rockford, Illinois
The air quality in Rockford, Illinois varies throughout the year. On many days, the Air Quality Index (AQI) shows that the air is good. This means the air pollution levels are low, making it safe for outdoor activities.
For example, a recent reading showed an AQI of 20, which is considered Good. This indicates very low levels of air pollutants, such as PM2.5, allowing residents to enjoy healthier air.
Key Measurements:
- Temperature: Average summer temperatures in Rockford can reach around 80.6°F, while winter temperatures can drop to 51.8°F.
- Wind Speed: Wind speeds can affect air quality. On windy days, Rockford experiences speeds around 8.9 mph.
- Pressure: Average atmospheric pressure affects air pollution. Higher pressure can sometimes trap pollutants closer to the ground.
- Visibility: Good air quality often leads to better visibility, essential for safe traveling and outdoor activities.
Localized Data
Certain areas within Rockford may report slightly different air quality levels. For instance, Ellis Avenue recently noted an AQI of 19. Such specific data helps residents plan their days better.
Topography of Rockford, Illinois
Rockford, Illinois, lies in Winnebago County.
The city is situated at a latitude of 42.2711° N and a longitude of 89.0940° W, making it easy to locate on a map.
The elevation of Rockford ranges from around 680 to 750 feet above sea level.
This relatively moderate elevation supports the various terrains and landscapes in the area.
Rockford features varied terrain with rolling hills and flat plains.
These landforms contribute to the scenic beauty and recreational opportunities available.
Several natural and man-made landmarks mark the city’s topography, including parks and rivers.
For instance, the Rock River runs through the city, adding to its distinct geographical features.
The city also has a regional airport, the Chicago Rockford International Airport.
Located at an elevation of 742 feet, it serves as an important hub for both passenger and cargo traffic.
Residents and visitors to Rockford can explore higher elevations at some local parks.
These spots offer views and hiking trails that showcase the area’s landscape.
Rockford’s topographic maps reveal more details about its elevation and terrain.
These maps can be useful for planning outdoor activities or understanding the city’s layout.
You can explore Rockford’s topography more with these topographic maps which provide detailed elevation and terrain data.
Extreme Weather Events that Occur in Rockford, Illinois
Rockford, Illinois experiences a variety of extreme weather events.
These include severe thunderstorms, flash floods, snowstorms, and tornadoes.
Thunderstorms and Tornadoes
Rockford has seen significant thunderstorm activity.
One notable event was on July 15, 2024, when a derecho caused widespread damage and numerous tornadoes. It was a record-breaking event in terms of wind damage.
Flash Floods and Heavy Rain
Flash floods are also common.
On July 13-14, 2024, Rockford experienced significant flash flooding with over 6 inches of rain.
Earlier, on May 7, a record rainfall of 1.37 inches was recorded at the Chicago Rockford International Airport.
Record-Breaking Winter Weather
The winter of 2023-2024 was the warmest on record for Rockford.
This period saw significant deviations from normal winter temperatures, impacting local weather patterns.
Climate Impact
Due to climate change, Rockford has become warmer over the decades.
The average temperature is now 3 degrees Fahrenheit higher than it was 50 years ago, leading to more frequent extreme weather events.
Notable Weather Records
- Warmest Year: 1921 and 1931, with an average temperature of 52.8°F.
- Coldest Year: 1917, with an average temperature of 44.9°F.
- Highest Dew Point: Specific data not provided, but often occurs during hot and humid summer months.
For more detailed information, visit the National Weather Service’s Record Summaries page.
Best Time of the Year to Visit Rockford, Illinois
Rockford entertains visitors year-round with distinct seasonal experiences.
The best times to visit are typically during late spring and early fall when the weather is mild and the city’s attractions are in full bloom.
What is Rockford, Illinois Like in Spring
Spring in Rockford is a season of renewal and moderate temperatures.
From March through May, temperatures range from 30°F to 70°F.
This is an ideal time to visit the world-class gardens in the area, such as Anderson Japanese Gardens.
Rainfall is moderate, with an average of 3 to 4 inches in these months.
Blossoms and greenery are abundant, making outdoor activities like hiking and biking particularly enjoyable.
Spring festivals and farmers’ markets also begin to pop up, offering locally-produced goods and crafts.
Light jackets and umbrellas are recommended as the weather can be unpredictable.
What is Rockford, Illinois Like in Summer
Summer in Rockford is warm and lively, making it the perfect time for outdoor activities.
From June to August, high temperatures usually range between 75°F and 85°F. The hottest months are typically July and August.
During this season, visitors can enjoy events like Rockford City Market and explore outdoor locations like Rock Cut State Park.
There is some rainfall, averaging about 3 to 4 inches per month, and the humidity can be noticeable.
Lightweight, breathable clothing is recommended for those planning to spend time outdoors.
What is Rockford, Illinois Like in Fall
Fall is a picturesque time in Rockford, with cooler temperatures and vibrant foliage.
From September to November, temperatures range from 45°F to 70°F.
The weather is pleasant and dry, making it an excellent season for hiking and attending local festivals.
The fall color display is particularly stunning in places like the Klehm Arboretum & Botanic Garden.
Rainfall decreases, averaging around 2 to 3 inches a month.
Layered clothing is optimal for this season due to fluctuating temperatures throughout the day.
What is Rockford, Illinois Like in Winter
Winter in Rockford is characterized by cold, windy, and snowy conditions.
From December to February, temperatures range between 15°F and 35°F.
Snowfall is common, often accumulating up to 4 inches per month.
Indoor attractions like museums and theaters become popular during these months.
Outdoor ice skating and holiday events also draw visitors looking for seasonal activities.
Winter sports enthusiasts will find nearby opportunities for skiing and snowboarding.
Warm clothing, including coats, gloves, and hats, is essential for those visiting during this season.