Letchworth Temperature by Month

Letchworth in Hertfordshire, United Kingdom sees significant seasonal temperature differences, with daytime highs between 8°C (46°F) in January and 23°C (73°F) in July, averaging 15°C (59°F) annually. Explore the full monthly breakdown below.

Depending on the time of the year, temperatures range from comfortable to cold in Letchworth. At night, minimum temperatures range from 13°C (55°F) in July to 2°C (36°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Letchworth 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 188 hours of sunshine.

The chart below shows the average temperature throughout the year:

Letchworth'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:

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.

Beijing, China averages 20°C (68°F) annually, but with big seasonal swings, very cold winters and hot 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 Letchworth this rarely lasts long on the ground.

For more on Letchworth's weather, including monthly rainfall, sunshine hours, and humidity, visit our Letchworth climate page.