May 2001 Temperatures in Bolton

Average max: 16.6C
Highest max: 25.2C, 12th
Lowest max: 9.7C, 15th

Average min: 7.3C
Highest min: 13.4C, 28th
Lowest min: 1.4C, 7th

Average temp(˝max+min): 12.0C

No. days above 25C: 1
No. days above 20C: 9

Overall a warm month, but with plenty of temperature variation. The first 15C+ day of the year was recorded on the 1st, followed by a notable max of 25.2C on the 12th, thereafter maxima dropped rapidly to give the lowest max of the month, 9.7C on the 15th. There was another warm spell starting on the 22nd with 5 successive days above 20C, indeed 9 days above 20C in May for NW England seems pretty good going. As regards minima, no air frost but a few chilly nights at the beginning of the month and a rather warm night at 13.4C recorded on the 28th.

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