A typical May from my records;

  • An average temperature of 9.3C
    • Maximum temperature expected about 22C.
    • Minimum temperature expected about -1.6C.
    • There are 4 frosts, air temperature at or below 0C.
    • Two days fail to reach 10C.
    • Eleven days are expected to reach or exceed 15C
    • Three days are expected to reach or exceed 20C.
  • Wind run would be around 3700km with the windiest day expected to have a wind run of 310km.
    • Maximum wind gust would be in the region of 60km/h.
  • There would be rain on 13 days with the monthly total of around 80mm.
    • Maximum daily rainfall is expected to be around 30mm

Rain totals for the month and year along with temperature and wind comparisons can be found here.

108
May Daily Observations
TemperatureWindRainfallBarometer
DateMinMaxMeanMean
(Km/h)
Gust
(Km/h)
Run (km)Prevailing Dir10 Minute Max (mm)Total (mm)Min (hPa)Max (hPa)Change (hPa)
1 0.4 17.1 8.5 2.6 22 59 East Nth East 0 0 1025.5 1032.0 -6.5
Light frost, clear and sunny with light winds.
2 4.2 19.9 11.7 2.0 19 44 East Nth East 0 0 1019.3 1025.1 -5.8
Clear and sunny, mild in the afternoon with light breezes tending NE.
3 9.1 16.5 12.1 2.7 17 62 East Nth East 0 0 1023.8 1025.6 -1.8
Clear and sunny with light breezes tending NE.
4 8.5 19.9 12.9 6.3 32 143 East Nth East 0 0 1014.8 1024.1 -9.3
Variable high cloud thickening later in the afternoon. NE winds easing and dying away in the afternoon.
5 7.0 19.1 11.3 1.0 15 22 North Nth East 0 0 1017.5 1013.3 +12.8
Overcast with high cloud, mild in the afternoon with light breezes.
6 7.3 15.6 12.3 5.8 27 131 East Nth East 0 0 1029.5 1033.0 +3.5
Morning cloud breaking with some sunny intervals in the afternoon, NE wind.
7 12.1 14.1 13.0 7.9 28 181 East Nth East 0.4 1.2 1025.5 1032.3 -6.8
Overcast with light rain and  drizzle clearing in the afternoon but low cloud remaining.
8 11.2 16.1 13.3 6.2 26 140 East Nth East 0 0 1017.6 1025.5 -7.9
Overcast with NE wind.
9 12.2 22.1 15.3 4.2 20 95 East Nth East 0.4 1.8 1011.4 1017.6 -6.2
Sunny morning, cloud increasing in the afternoon with light showers in the afternoon and a period of rain in the evening. Mild with light NE winds.
10 8.3 19.6 13.1 2.2 15 51 East Nth East 0.2 0.2 1011.5 1021.4 +9.9
Showers clearing before dawn, sunny and mild with light winds tending NE.
11 7.5 12.8 10.6 4.0 24 91 East Nth East 0 0 1011.7 1022.7 -11.0
Morning fog lifting a little but remaining as low cloud for the day. Light NE winds.
12 8.6 17.7 12.3 4.6 36 104 East Nth East 0.2 0.2 988.4 1011.6 -23.2
Cloud increasing with light showers in the afternoon. A southerly change in the evening with strengthening winds.
13 3.2 13.4 9.6 11.4 56 261 South Sth West 1.0 4.4 992.4 1022.1 +29.7
Early morning southerly with strong winds and brief rain clearing by dawn. Cloud clearing in the afternoon and cool southerly winds dying away in the evening.
14 3.3 14.7 10.2 3.5 22 79 East Nth East 0 0 1004.7 1021.4 -16.7
Cloud increasing in the morning, overcast in the afternoon. Light NE winds
15 3.7 18.4 10.5 4.3 44 98 North Nth West 0 0 995.1 1006.2 -11.1
High nor'west arch cloud clearing in the afternoon with mild northerly winds.
Wild weather hits the south with 120kmh wind gusts and heavy rain
16 3.8 15.7 7.4 7.9 58 181 South Sth West 0.8 4.6 996.8 1013.8 +17.0
Cloud increasing with a cold southerly change from midday with a period of rain. Rain clearing in the evening and wind easing.
Snow flurries in Dunedin as temperatures plummet
17 -1.1 11.1 4.7 2.4 24 54 South Sth West 0 0 1014.3 1021.8 +7.5
First frost of the year. Clear and sunny with a cool southerly breeze.
Trouble-making jetstream eases but more gales to hit southerners this weekend
18 1.3 14.5 7.2 1.5 18 34 East Nth East 0 0 1001.8 1017.3 -15.5
Overcast with high nor'west arch cloud for much of the day. Cloud breaking later in the afternoon. Light winds tending NE.
19 3.6 12.9 8.1 4.8 34South Sth West 0 0 1000.5 1012.8 +12.3  
Variable cloud with a southerly wind dying out by late afternoon.
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