Alton (IL) Temperatures: Monthly Averages and Year-Round Insights
On this page, we’ll explore Alton’s temperature statistics in detail, including day and night variations and monthly averages. We’ll also compare the annual temperature to other cities in the United States of America.
Monthly Temperature Averages
Visitors to Alton can expect significant temperature changes throughout the year. Average maximum daytime temperatures reach a very warm 31°C in July. In January, the coolest month of the year, temperatures drop to a cold 4°C. At night, expect even cooler temperatures, with lows averaging around -5°C.
The chart below illustrates the average maximum day and minimum night temperatures in Alton by month:
The early hours of 4 AM to 6 AM often see the lowest temperatures, while 3 PM marks the peak of the day’s heat as the sun’s impact is strongest. July, the city’s warmest month, boasts 311 hours of sunshine.
The chart below shows the average temperature throughout the year:
January, the city’s coldest month, receives about 42 mm of rainfall spread over roughly 7 days. For more information, please visit our Alton Precipitation page.
Annual Temperatures in the United States of America Compared
The map below shows the annual temperature across the United States of America. You can also select the different months in case you are interested in a specific month.
very warm
warm
pleasant
moderate
cold
very cold
Alton Temperatures Compared World Wide
Alton’s average annual maximum temperature is 19°C. Let’s compare this with some popular tourist destinations:
Athens, Greece, experiences an average annual temperature of 23°C, with hot summers and mild winters typical of a Mediterranean climate.
In contrast, in ReykjavÃk, Iceland, the average annual temperature is significantly lower at 9°C, with mild summers and cold winters.
Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with an average annual temperature of 23°C, featuring hot summers and mild winters.
Perth, Australia, experiences a Mediterranean climate, with a pleasant average temperature of 25°C.
How does the temperature feel?
Humidity is an essential factor in how you experience temperature. When a warm period is accompanied by high humidity, it results in a higher perceived temperature. This is especially true when temperatures exceed 25°C, as it can cause greater discomfort.
On the other hand, in cooler months, especially when temperatures dip below 10°C, high humidity can intensify the cold. This makes the air feel much colder than it really is.
In Alton, during the coolest month, January, you will experience 72% humidity, which is considered high. This is accompanied by an average maximum temperature of 4°C. In the warmest month, July, the humidity is 68% combined with an average maximum temperature of 31°C, which creates a high-feel temperature. Explore our detailed page on humidity levels for further details.
How are these Temperatures Measured?
Generally, temperature data depicting climate is usually given over a 30-year average in order to reduce short-term fluctuations and reveal better long-term trends in climate conditions.
This temperature data is taken from land-based thermometers, ocean buoys, ships, and satellites. These measurements are transmitted to weather stations and climate centers around the globe where they are processed, averaged, and analyzed in order to monitor the trends and create climate models.
Effects of Temperature on Weather and Climate
Temperature variations influence precipitation patterns in Amsterdam:
Rainfall: Warm air holds more moisture, leading to heavier rain during warmer months. However, precipitation is generally moderate year-round.
Snow: Occasional snowfall occurs in winter, though it rarely lasts very long.
For more detailed information about Alton’s weather, including monthly rainfall, sunshine hours, and humidity levels, visit our Alton climate page.
Current temperature in Alton (IL)
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