Current climate: July 2017

July was a tumultuous month due to the passage of several active low pressure systems and consequently there were numerous high impact weather events throughout the month. The lower pressure than normal over the country led to more south-westerlies than normal across the North Island and more north-easterlies than normal across the South Island.

Rainfall

Rainfall was well above normal (>150% of the July normal) for the Greater Wellington Region, Otago and mid to south Canterbury. Rainfall was above normal (120-149% of the July normal) for large parts of the North Island and Nelson.  Below normal rainfall (50-79% of the July normal) was observed in parts of Northland, the West Coast, western Southland and western Otago.

Temperature

July temperatures were near average (-0.50°C to +0.50°C of the July average) for much of the country. Temperatures were below average (-0.51°C to -1.20°C of the July average) about the districts of Hurunui, Mackenzie, Waitaki, Dunedin and Clutha as well as eastern Southland. Pockets of above average temperature (+0.51°C to +1.20°C of the July average) were observed in the Waikato and Manawatu-Whanganui.

Sunshine

July sunshine hours were near normal (90-109% of the July normal) for much of the country. The exceptions to this were parts of Wellington, Taranaki, Nelson and Christchurch where below normal (75-89% of the July normal) or well below normal (< 75% of the July normal) sunshine was observed.

Soil Moisture

As at 1 August 2017, soil moisture levels were near normal for virtually the entire country. Soil moisture was slightly higher than normal for coastal areas from Timaru to Dunedin.

Departure from average air temperature for July 2017.
End of month water balance in the pasture root zone for an average soil type where the available water capacity is taken to be 150 mm.
Percentage of normal rainfall for July 2017.
Research subject: Climate