Being the only significant upland area in England away from the coast has implications on the climate of Upper Teesdale. The winters are harsh and the summers short.
Daily weather data from Upper Teesdale has been recorded since 1931.
At the top of the dale, the growing season is short. The average temperature in Upper Teesdale in May is similar to the average temperature in London in January. The cool, wet climate directly impacts what flora and fauna thrive, and the weather pattern since 2000 has altered, with more extremes of rainfall, sunshine and strong winds. Deep snow is much less frequent and not so long lasting.