Rochelle (IL) Temperature by Month
The average annual maximum temperature in Rochelle, Illinois, United States of America is 14°C (57°F), with daytime highs ranging from -2°C (28°F) in January to 28°C (82°F) in July. This page covers monthly averages, day-night differences, and how Rochelle compares to cities worldwide.
Rochelle Monthly Temperatures
In Rochelle, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 16°C (61°F) in July to -11°C (12°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Rochelle by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: Rochelle vs the United States of America
The map below shows the annual temperature across the United States of America. You can also select individual months if you want to compare a specific time of year.
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Rochelle vs World: Temperature Compared
Rochelle's average annual maximum temperature is 14°C (57°F). To put that in context, here's how it compares to a few well-known destinations:
Lisbon, Portugal averages 21°C (70°F) annually — warm summers, mild winters, and rain mainly in the cooler months.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Adelaide, Australia averages 21°C (70°F) a year, with warm summers, mild winters, and relatively low rainfall year-round.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Rochelle's weather — including monthly rainfall, sunshine hours, and humidity — visit our Rochelle climate page.
