North Sioux City (IA) Temperature by Month
North Sioux City in Iowa, United States of America sees significant seasonal temperature differences, with daytime highs between -1°C (30°F) in January and 30°C (86°F) in July, averaging 16°C (61°F) annually. Explore the full monthly breakdown below.
North Sioux City Monthly Temperatures
In North Sioux City, temperatures can shift dramatically between very warm in summer and very cold in winter. Nights follow the same pattern, with lows ranging from 18°C (64°F) in July to -12°C (10°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in North Sioux City by month:
The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM.
The chart below shows the average temperature throughout the year:
Temperature: North Sioux City 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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North Sioux City vs World: Temperature Compared
North Sioux City's average annual maximum temperature is 16°C (61°F). To put that in context, here's how it compares to a few well-known destinations:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
On the cooler end, Oslo, Norway averages just 10°C (50°F) annually, with pleasant summers but long, cold winters.
Seoul, South Korea averages 18°C (64°F) a year, with four clear seasons, cold winters, and hot humid summers.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
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.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in North Sioux City this rarely lasts long on the ground.
For more on North Sioux City's weather — including monthly rainfall, sunshine hours, and humidity — visit our North Sioux City climate page.
