Coldest July for 22 years, duller and wetter than average

Armagh Observatory reports that July 2015 was much cooler than average, the coldest July for 22 years, and duller and wetter than average.

The mean monthly temperature was 14.3 degrees Celsius, approximately 1.4 degrees C colder than the most recent 30-year (1981–2010) average July temperature at Armagh, which is 15.7 C. There were several very cold nights, notably the 15th, which had a minimum air temperature of 5.0 C. This was the coldest July night at Armagh for 31 years, that is, since 4th July 1984 (minimum air temperature of 4.7 C). There were also three ground frosts, the lowest of which, also on the 15th, had a recorded minimum grass temperature of –2.0 C. There were no air frosts. The warmest day (highest maximum air temperature) was 24.9 C, which occurred on the 1st.

July 2015 was also duller than average, with a recorded 117.7 hours of strong sunshine at Armagh. This is approximately 86% of the most recent 30-year (1981–2010) average number of hours of strong sunshine in July at Armagh. This was the dullest July for three years, that is, since July 2012. The sunniest day was the 3rd, with 11.3 hours of strong sunshine.

Total precipitation for the month was 78.9 mm, including two trace values, which is approximately 26% more rainfall than the most recent 30-year average July precipitation at Armagh. This was the wettest July at Armagh for three years, also since 2012, with only 2 days having no recorded precipitation at all. The wettest day was the 27th, with a total of 15.5 mm of rainfall.

These data refer to observations at Armagh Observatory, which has been recording the weather at Armagh since 1795.

For further information please contact: Mark Bailey at the Armagh Observatory, College Hill, Armagh, BT61 9DG. Tel.: 028-3752-2928; FAX: 028-3752-7174; mebat signarm.ac.uk; URL: climate.arm.ac.uk

Last Revised: 2015 August 11th