Climate Summary September 2017 - Tonga Meteorological Service

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Climate in brief. Rainfall was above average in throughout the country except for Ha'apai which was just a little below
Climate Summary September 2017 METEOROLOGY DIVISION Ministry of Meteorology, Energy, Information, Disaster Management, Environment, Climate Change and Communications

Climate in brief. Rainfall was above average in throughout the country except for Ha’apai which was just a little below average. Refer to Graph 1. Overall, September rainfall was above average, this amount is a relief for most places since the previous months below average rainfall were experienced throughout the country. Warmer than average temperatures were experienced across the country except in Niuatoputapu where it was 0.3oC cooler than average. The average temperature in September was 24.2°C which was 0.3°C warmer than average from Tonga’s 6 station). Refer Table 1. Highest maximum temperature was 33.0oC recorded in Niuafo’ou on the 2nd and the lowest minimum temperature was 12.8°C in Fua’amotu on the 30th. Refer Table 2.

Graph 1: Shows September 2017 rainfall Vs average for Tonga.

Summary of Temperatures (oC) Table 1. Summary of 2017 Temperatures Stations

Mean Maximum Temp

Mean Minimum Temp

2017 Mean Temperature o C

Average (Normal) Temperature (1981-2010) o C

Departure from normal o C

Niuafoóu

31.2

22.5

26.8

26.2

+0.6

Niuatoputapu

29.0

23.2

26.1

26.4

-0.3

Vava’u

27.0

20.3

23.7

23.7

0

Ha’apai

26.5

21.4

23.9

23.1

+0.8

Fua’amotu

25.8

18.5

22.2

21.7

+0.5

Nuku’alofa

26.6

18.7

22.7

22.2

+0.5

Average

27.7

20.8

24.2

23.9

+0.3

Table 2. Summary of Temperatures Stations

Niuafo’ou 1974-2017 NIuatoputapu (1958-2017) Vava’u. (1951-2017) Ha’apai (1961-2017) Fua’amotu (1980-2017 Nuku’alofa (1949-2017)

September 2017 Temperature 0 C

September Temperature from start of record 0 C Highest Lowest Maximum Minimum

Highest Maximum

Lowest Minimum

33.0

19.4

33.2

16.4

30.0

19.6

32.9

11.1

29.0

13.2

31.8

11.8

29.0

17.5

30.4

13.0

28.5

12.8

30.1

8.7

28.7

13.3

30.1

10.6

SUMMARY OF RAINFALL 2017 Table 3. Summary of September rainfall 2017 Stations

Niuafo’ou Niuatoputapu Vava’u Ha’apai Fua’amotu Nuku’alofa

September 2017 Total Rainfall (mm

Normal (19812010) (mm)

% Normal

Highest September rainfall from start of record (mm)

Number of day with rain

Highest 1-Day Rainfall (mm)

Highest 1Day Rainfall From start of record (mm)

171.3 133.5 193.6 100.7 200.3 209.9

112.9 90.8 145.9 113.2 127.2 111.2

152 147 133 89 157 189

474.0 542.0 467.0 238.0 235.0 259.0

12 12 13 7 10 8

63.9 41.7 87.0 67.6 96.1 116.2

127.0 268.7 145.8 183.6 167.3 174.2