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Climate Lab — Jamestown, Saint Helena

Climate Lab·

Monthly climate metrics across temperature, precipitation, wind, and UV.

MetricJanFebMarAprMayJunJulAugSepOctNovDecYear
Temperature
Daily high°C
24
25
25
25
24
22
21
20
20
20
21
22
22
Daily mean°C
23
24
25
24
23
22
20
20
19
19
20
22
22
Daily low°C
23
24
24
23
22
21
20
19
19
19
20
21
21
Thermal comfort
High feels°C
26
26
26
25
24
23
19
19
18
19
21
23
22
Mean feels°C
23
23
24
23
21
17
15
15
15
16
18
19
19
Low feels°C
17
18
19
17
15
12
10
9
9
10
12
13
13
Humidity
Humidity%
78
75
73
73
71
70
72
73
76
78
77
79
74
Dewpoint°C
19.0
19.6
19.6
18.8
17.5
15.7
15.1
14.7
14.8
15.2
15.9
17.8
17.0
Precipitation
Rainfallmm
14
14
15
12
17
13
15
14
13
10
9
12
158
Rain days≥1mm
2
2
5
2
4
5
3
2
0
0
0
0
25
Wind
Wind avgm/s
6.4
6.7
6.7
6.8
7.4
7.5
8.5
8.0
8.7
7.7
7.1
7.2
7.4
Wind gustsm/s
8.7
9.0
8.9
9.3
10.1
11.3
11.9
10.8
11.0
10.9
9.1
9.6
10.0
Sun & UV
Sunshinehrs/day
9.9
9.4
9.2
8.7
7.9
7.5
7.7
8.4
8.6
9.0
9.6
9.6
8.8
Clear skyindex
65%
56%
61%
51%
45%
42%
36%
34%
34%
39%
49%
53%
47%
UV indexmax avg
12.2
12.1
10.9
9.1
7.3
6.3
5.8
6.5
7.3
9.1
10.7
11.2
9.0
Based on 2014–2024 hourly climate data · Updated Mar 2025
Confidence: High

How winter feel compares

Compared worldwide

Jamestown: 10.5 °C. Typical range: -9.1–15.9 °C. Low anchor: Toronto, -18.1 °C. High anchor: Singapore, 25.2 °C.

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