Trefriw Temperature by Month
Trefriw, Gwynedd, United Kingdom has an average annual maximum temperature of 14°C (57°F), ranging from 8°C (46°F) in February to 20°C (68°F) in July. Below you'll find a full monthly breakdown and a comparison with cities worldwide.
Trefriw Monthly Temperatures
Visitors to Trefriw can expect significant temperature changes throughout the year. Nighttime temperatures also vary widely, ranging from 12°C (54°F) in July to 2°C (36°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Trefriw by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. July, the city's warmest month, sees 155 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Trefriw 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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Trefriw vs World: Temperature Compared
Trefriw'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:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation — summers are often cool and foggy, winters mild.
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.
Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round — large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.
For more on Trefriw's weather — including monthly rainfall, sunshine hours, and humidity — visit our Trefriw climate page.
