Isle of Portland
Climate
Table:
Climate data for Isle of Portland climatic averages

Month

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Year

Mean daily maximum °C (°F)

8.4
(47.1)

8.0
(46.4)

9.4
(48.9)

11.5
(52.7)

14.3
(57.7)

16.8
(62.2)

18.8
(65.8)

19.3
(66.7)

17.8
(64.0)

14.8
(58.6)

11.6
(52.9)

9.2
(48.6)

13.4
(56.1)

Daily mean °C (°F)

6.6
(43.9)

6.0
(42.8)

7.3
(45.1)

9.0
(48.2)

11.7
(53.1)

14.3
(57.7)

16.4
(61.5)

16.9
(62.4)

15.4
(59.7)

12.8
(55.0)

9.7
(49.5)

7.3
(45.1)

11.2
(52.2)

Mean daily minimum °C (°F)

4.7
(40.5)

4.0
(39.2)

5.2
(41.4)

6.4
(43.5)

9.1
(48.4)

11.8
(53.2)

14.0
(57.2)

14.5
(58.1)

13.0
(55.4)

10.8
(51.4)

7.7
(45.9)

5.4
(41.7)

8.9
(48.0)

Average rainfall mm (inches)

67.3
(2.65)

53.1
(2.09)

52.3
(2.06)

46.9
(1.85)

44.1
(1.74)

39.3
(1.55)

35.1
(1.38)

41.4
(1.63)

46.9
(1.85)

81.6
(3.21)

81.6
(3.21)

78.2
(3.08)

667.9
(26.30)

Average rainy days (≥ 1 mm)

12.4

9.8

9.6

8.5

8.2

6.6

6.6

7.1

7.8

11.5

12.4

12.0

112.5

Mean monthly sunshine hours

64.6

86.7

126.3

191.0

225.0

226.5

236.9

218.0

167.2

115.1

82.0

59.7

1,798.9

Source: 1981–2010 averages for the Isle of Portland climate station and Weymouth Cefas station. Sources: Met Office[58] and Cefas[57]

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