Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2025
2024
2023
2022
2021
January
73.0
77
71
83
60
74
February
82.1
64
85
77
90
83
March
92.2
88
93
94
98
April
93.6
87
93
91
96
May
94.0
84
95
96
96
June
93.1
87
95
92
95
July
94.0
88
92
94
94
August
93.5
87
92
95
90
September
89.5
93
88
80
93
October
79.2
62
83
77
79
November
67.4
64
80
54
62
December
65.4
61
67
61
50
Average
84.5
70.2
81.0
87.6
83.6
86.9
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
3.3
4.9
4.0
4.7
3.2
0.9
February
5.5
4.2
9.4
4.7
6.7
5.0
March
9.6
12.4
9.3
10.8
9.0
April
14.5
15.5
11.5
12.1
11.3
May
18.4
19.8
19.1
20.6
15.0
June
23.9
23.0
25.0
25.8
25.1
July
25.0
25.1
25.3
26.3
23.0
August
25.0
26.8
23.8
26.8
20.8
September
19.9
20.5
23.6
17.6
20.5
October
14.6
14.0
16.0
16.3
12.9
November
7.1
7.0
7.5
8.1
5.5
December
4.0
4.0
5.2
0.2
3.5
Average
13.0
4.6
15.1
14.7
15.1
12.9
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
-3.9
-3.6
-4.2
-1.1
-1.0
-3.7
February
-3.6
-4.0
2.7
-3.2
-2.9
-6.5
March
-1.3
1.0
0.5
-4.5
-3.9
April
1.8
3.3
1.9
0.8
-1.3
May
6.0
7.5
6.5
6.5
3.9
June
11.2
11.9
9.8
10.4
11.8
July
11.3
11.3
11.5
10.6
12.0
August
11.9
13.3
12.8
10.9
10.5
September
7.4
9.8
8.5
6.2
7.7
October
4.5
6.7
5.0
4.9
1.5
November
0.8
1.1
1.5
0.6
1.0
December
-2.8
-1.0
0.2
-6.7
-1.3
Average
3.3
-4.8
5.3
4.6
3.6
3.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
21.5
24
25
25
24
27
February
16.1
14
21
19
21
13
March
13.3
10
26
8
7
April
12.5
21
17
18
11
May
10.3
16
9
7
19
June
7.2
11
5
5
6
July
8.2
12
11
9
9
August
9.4
9
20
7
12
September
9.8
16
7
18
2
October
9.5
13
14
11
4
November
15.8
17
28
24
13
December
19.8
14
35
34
18
Average
12.5
19.0
14.8
17.3
14.2
11.0
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2025
2024
2023
2022
2021
January
4.4
4
5
5
6
3
February
4.7
3
5
5
7
3
March
4.8
4
6
3
4
April
4.5
5
5
5
5
May
3.8
3
3
4
6
June
3.3
4
3
4
2
July
3.5
3
5
4
3
August
3.1
3
4
3
3
September
2.9
4
2
3
2
October
3.2
3
3
2
3
November
3.3
4
5
2
3
December
3.8
3
4
3
3
Average
3.7
3.6
3.7
4.1
3.8
3.4
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
222°
251°
249°
263°
250°
February
102°
238°
265°
248°
084°
March
218°
242°
074°
260°
April
237°
285°
296°
294°
May
186°
050°
257°
254°
June
261°
307°
263°
280°
July
258°
250°
285°
259°
August
253°
248°
328°
261°
September
261°
226°
252°
248°
October
180°
240°
198°
221°
November
221°
243°
187°
234°
December
228°
246°
035°
251°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.