Cooler in December
The first week of December has produced below average temperatures, but this is expected to change as we move further into the summer months. Rainfall has been about the average, keeping in mind that December is the second wettest month of the year after June. This is largely because the warmer days produce convective thunderstorms, often a feature of December in Taupo¯. The wettest December in 2011 produced 231.0mm on 18 wet days while the driest in 2009 produced 39.0mm on 10 days. Convective thunderstorms occur when the sun heats the ground and the hot air rises to the colder upper atmosphere and the cumulus clouds (like blobs of cotton wool) start to billow and grow during the day into large towering cumulus (cauliflower-like clouds). These often billow as they grow further and a cirrus-like anvil forms. These are then cumulo-nimbus or thunderclouds that empty out often bringing torrential downpours and even hail. These are generally localised and while the Taupo¯ Airport might receive a drenching, not far away Taupo¯ may receive no rain.
The last week of spring, November, recorded just 92.0mm of rain (22.8mm above average) the maximum temperature averaged 18.7 deg (0.9 degrees above) and the minimum temperature averaged 7.7 degrees (0.1 degrees above).
The weather should deteriorate late on Monday after a warm and sunny weekend, with the rest of the week quite unsettled with little wind.