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
2020
January
86.0
89
94
85
84
78
February
92.9
93
86
99
86
96
March
96.4
94
94
98
100
99
April
98.5
100
96
98
99
100
May
98.1
94
100
100
99
100
June
98.9
98
99
99
99
99
July
98.9
98
98
100
99
100
August
98.6
100
95
100
99
99
September
96.8
97
95
97
97
October
92.6
94
91
89
95
November
80.6
92
78
77
71
December
80.1
81
78
82
78
Average
94.9
96.2
94.7
95.1
94.1
94.4
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
2020
January
5.5
6
7
6
5
7
February
8.6
11
8
10
8
10
March
12.3
14
12
14
12
12
April
16.2
17
14
15
13
20
May
20.5
21
21
23
17
20
June
25.9
23
28
27
27
24
July
26.7
27
26
28
24
26
August
26.6
28
25
30
23
28
September
22.1
26
20
23
23
October
16.3
18
18
15
15
November
9.4
10
11
8
10
December
6.1
8
2
7
6
Average
16.6
18.3
16.8
17.4
14.9
16.6
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
0.5
-1
3
1
0
1
February
1.0
5
2
2
-1
3
March
2.7
4
4
2
2
3
April
5.1
6
5
5
2
6
May
9.6
11
10
11
7
8
June
14.0
13
15
14
15
13
July
14.9
15
15
15
15
14
August
15.3
15
15
18
13
17
September
10.8
13
11
11
11
October
7.5
8
9
5
8
November
3.5
5
4
3
3
December
1.7
3
-3
2
2
Average
7.4
8.4
8.0
7.5
6.2
7.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
23.1
14
19
18
41
16
February
16.4
16
11
24
22
28
March
15.9
16
26
6
14
15
April
12.3
16
15
17
15
4
May
12.6
17
9
6
21
9
June
7.2
11
3
8
7
14
July
8.3
11
11
2
11
6
August
9.2
4
18
6
13
6
September
9.1
4
17
5
7
October
16.0
20
14
16
22
November
18.0
26
13
24
8
December
23.6
19
21
19
26
Average
13.1
12.9
14.0
11.0
15.9
12.1
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
2020
January
8.4
9
10
8
8
7
February
9.1
9
9
11
7
12
March
9.0
8
10
8
8
11
April
8.3
9
9
9
8
8
May
7.7
7
9
8
9
8
June
7.4
7
8
7
6
7
July
7.1
7
8
7
7
8
August
6.8
7
7
7
7
7
September
6.6
6
7
6
6
October
7.2
7
6
6
8
November
7.0
10
6
6
6
December
7.6
10
6
7
6
Average
7.7
7.6
8.3
7.5
7.1
7.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
225°
205°
228°
227°
200°
February
205°
248°
219°
053°
222°
March
208°
228°
052°
238°
095°
April
229°
020°
027°
341°
053°
May
160°
023°
279°
223°
015°
June
249°
030°
262°
347°
250°
July
223°
230°
310°
226°
247°
August
225°
229°
032°
236°
222°
September
141°
237°
116°
150°
October
205°
193°
191°
199°
November
206°
197°
202°
185°
December
214°
033°
205°
171°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.