There were a few cold snaps and frosty mornings as the month progressed, with the temperature dropping into the negatives on May 21.
Looking ahead to the long weekend, Mr Hines said Rotorua could expect more chilly mornings but would dodge most of the rain.
"There will be significant rain about the Coromandel, Auckland and Northland regions Friday and Saturday, Rotorua is far enough south to dodge the worst of it, and may just get the odd shower on Saturday," he said.
"Rotorua should avoid the worst of it, with a lot of the rain anticipated to fall over the ranges in the Gisborne area."
For June on the whole Mr Hines said Rotorua would return to about average rainfall.
"We anticipate slightly below average temperatures, particularly in the first half of the month," he said.
Rotorua weather
Saturday - Cloudy periods, becoming fine in the afternoon. South easterlies. High 14c Low 4c
Sunday - Mainly fine. Southerlies. High 13c Low 2c
Monday - Occasional showers. Light winds. High 11c Low 2c
Tuesday - A few showers, clearing. Light winds. High 13c Low 3c
Wednesday - Fine. Little wind. High 13c Low 2c
Thursday - Fine with light winds. High 12c Low 3c
Friday - Showers with light winds. High 12c Low 4c
- Metservice