Harleston Temperature by Month
Harleston, Norfolk, United Kingdom has an average annual maximum temperature of 15°C (59°F), ranging from 8°C (46°F) in January to 22°C (72°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Harleston Monthly Temperatures
Depending on the time of the year, temperatures range from comfortable to cold in Harleston. At night, minimum temperatures range from 14°C (57°F) in July to 3°C (37°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Harleston by month:
The minimum temperature is often recorded between 4 AM and 6 AM, while the highest temperature is usually reached at 3 PM, when the sun's heating effect is strongest. July, the warmest month, gets 213 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Harleston vs the United Kingdom
The map below shows the annual temperature across the United Kingdom. You can also select individual months if you want to compare a specific time of year.
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Harleston vs World: Temperature Compared
Harleston's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:
Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.
Zermatt, Switzerland averages just 4°C (39°F) annually due to its altitude, with very cold winters and cool summers even at its warmest.
Chicago, USA averages 15°C (59°F) annually — known for extreme seasonal swings, from bitterly cold winters to warm summers.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
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 Harleston this rarely lasts long on the ground.
For more on Harleston's weather — including monthly rainfall, sunshine hours, and humidity — visit our Harleston climate page.
