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
2024
2023
2022
2021
January
84.8
86
83
84
February
79.7
72
90
86
March
86.5
85
90
90
April
93.7
95
90
98
97
May
88.6
93
82
93
89
June
91.5
91
95
95
82
July
92.0
93
95
91
88
August
97.2
100
98
93
96
September
93.3
96
91
93
October
87.7
91
87
80
November
84.9
88
84
79
December
64.3
68
52
57
Average
88.2
88.6
89.2
90.4
84.7
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
2024
2023
2022
2021
January
6.3
5
7
7
February
8.0
9
7
8
March
9.0
11
9
7
April
11.0
13
12
10
8
May
15.1
19
15
15
12
June
18.6
17
21
18
19
July
20.0
19
20
20
20
August
20.2
21
21
20
19
September
18.7
21
17
18
October
14.0
15
14
13
November
9.1
9
10
9
December
5.6
7
3
6
Average
13.7
14.3
13.6
12.7
14.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
2.7
1
4
4
February
3.5
5
2
3
March
3.0
5
4
1
April
4.4
7
4
4
3
May
8.4
11
8
8
7
June
11.3
11
12
11
12
July
13.8
13
14
13
15
August
13.3
14
13
13
14
September
11.3
13
10
12
October
9.3
10
10
9
November
5.3
5
6
5
December
1.8
4
-1
2
Average
7.9
8.4
7.5
7.0
8.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
January
11.9
12
12
11
February
15.3
16
8
24
March
10.0
6
19
0
April
6.3
8
4
1
18
May
5.6
4
4
4
14
June
1.3
1
0
1
5
July
4.6
1
8
4
3
August
2.9
0
5
1
4
September
4.2
4
4
5
October
9.6
8
3
18
November
9.9
13
4
8
December
21.6
19
24
29
Average
7.3
6.6
8.0
5.0
9.8
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
2024
2023
2022
2021
January
10.7
11
10
11
February
11.6
11
12
14
March
9.4
9
11
7
April
9.3
10
9
9
6
May
7.7
7
8
8
8
June
7.3
8
8
6
7
July
7.3
7
8
7
7
August
7.5
8
8
7
8
September
6.8
7
7
8
October
8.9
9
7
9
November
8.8
10
8
7
December
9.6
10
9
8
Average
8.2
8.8
9.0
7.8
7.4
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
236°
223°
274°
February
226°
280°
266°
March
165°
243°
019°
April
235°
048°
020°
027°
May
076°
007°
286°
246°
June
277°
011°
288°
350°
July
269°
235°
289°
296°
August
233°
255°
001°
273°
September
186°
117°
241°
October
228°
181°
195°
November
220°
156°
240°
December
235°
105°
227°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.