July 2007 Drier, Calmer

Tawa’s climate during July 2007 was drier and calmer than last year. Temperatures were similar to 2005 and 2006, but warmer than 2003 and 2004.

July 2003 was a frosty month in Tawa, with ground frosts being noted on 10 days. The month’s only thunderstorm was a hangover from a storm which began at the end of June and, despite the frosty conditions, rain or drizzle was recorded on 14 days.

July 2004 was also cool and frosty, with a ground frost being noted on 7 days. Rain or drizzle was recorded on 19 days, but winds were milder with a southerly gale making its presence felt on the 22nd.

July 2005 was warmer than the previous two years, with only one frosty morning – on the 1st. Rain was recorded on 17 days and 124 mm was recorded for the month.

July 2006 was memorable for a series of three southerly storms which brought record rainfall to parts of the Lower North Island. The storms arrived in succession dominating the end-of-week weather patterns for three consecutive weeks, causing numerous landslips some of which damaged houses in the Wellington region.

Tawa’s average temperature for July 2006 was about a degree cooler than July 2005, but it was still warmer than July 2003 and 2004. The month’s rainfall at Tawa was 205 mm bringing the year-to-date total to 719 mm, exceeding 2005’s total rainfall of 713 mm.

July 2007 started with drizzly, showery conditions combined with low cloud on the 1st and 2nd. The sun broke through on the 3rd, but a gusty northerly brought more rain the following day. The damp conditions persisted until a late clearance on the 7th allowed a frost to settle overnight. Despite a sunny day on the 8th, temperatures remained in single digits with still conditions.

Chill misty conditions on the 9th turned to steady rain that afternoon and the gloomy conditions worsened on the 11th and 12th under the influence of the cold southerly. The wind dropped and the sun made a welcome appearance on the 13th and dominated the weather, apart from a period of showers early on the morning of the 15th, until the 17th. Still, cloudy conditions then applied until rain set in on the 20th.

A cold southerly set in late on the 21st, increasing in strength the following day bringing showers and hail, before conditions eased as the wind changed to the north. The 24th was a calm and sunny interlude before the gusty northerly which predominated between the 25th and 28th. The month ended on a wet note with steady rain, low cloud and fog on the 30th slowly improving the following day.

Unlike 2006, the region was free of major storm damage during July 2007. It was northern New Zealand which bore the brunt of nature’s fury, with floods in Northland and wind damage in Auckland on July 10th, and storm damage in the Coromandel the following day. It was generally considered that the disruption and damage experienced in Northland was worse than that caused by Cyclone Bola in 1988.

Automatic and manual readings taken at Tawa since 2003 can be summarised as follows:

The lowest July temperatures were -1 °C (2003), 0 °C (2004), 1 °C (2005), 0 °C (2006), 0 °C (2007).
The average daily low temperatures were 4 °C (2003), 5 °C (2004), 7 °C (2005), 6 °C (2006), 7 °C (2007).
The highest July temperatures were 15 °C (2003), 14 °C (2004), 15 °C (2005), 15 °C (2006) 15 °C (2007).
The average daily high temperatures were 12 °C (2003), 11 °C (2004), 13 °C (2005), 12 °C (2006), 12 °C (2007).

Average temperature: 10.4°C (2005), 9.5°C(2006), 9.4 °C (2007).
Average humidity: 89% (2005), 89% (2006), 89% (2007)

Days with frost: 10 (2003), 7 (2004), 1 (2005), 1 (2006), 2 (2007).
Days with rain: 14 (2003), 19 (2004), 17 (2005), 17 (2006), 19 (2007).
Days with thunderstorms: 1 (2003), 1 (2004), 1 (2005), 1 (2006), none (2007).
Days with hail: 3 (2003), none (2004), 2 (2005), 1 (2006), 1 (2007).
Days with strong winds: 2 (2003), 1 (2004), 1 (2005), 13 (2006), 5 (2007).
Rainfall: 124 mm (2005), 205 mm (2006), 140 mm (2007).

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