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
82.0
84
87
78
80
77
February
86.5
97
86
89
81
91
March
93.2
92
93
94
92
97
April
97.1
100
96
97
92
99
May
96.4
99
89
97
99
97
June
99.0
100
98
99
99
100
July
99.1
99
99
100
100
99
August
99.3
100
100
99
98
100
September
98.2
100
99
97
100
October
93.4
99
96
94
95
November
82.8
94
76
89
83
December
83.4
86
97
84
79
Average
94.0
97.1
94.5
94.2
93.2
94.2
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
5.2
5
7
5
6
5
February
6.7
10
5
9
4
8
March
11.3
12
13
6
9
15
April
18.3
23
17
19
15
17
May
22.3
22
21
20
23
22
June
28.5
31
27
28
26
29
July
31.1
35
30
29
33
31
August
31.6
32
34
32
31
31
September
25.8
28
25
22
29
October
19.3
21
18
16
23
November
11.4
15
12
13
10
December
7.8
10
8
9
6
Average
18.6
21.2
18.9
17.9
17.3
18.7
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
-3.7
-3
-4
-2
-3
-1
February
-2.8
2
-3
1
-4
0
March
1.8
2
4
-1
0
3
April
6.2
10
8
7
6
2
May
11.2
10
11
9
12
10
June
16.5
17
16
17
17
17
July
18.7
21
18
18
19
19
August
18.7
18
20
21
21
16
September
13.3
13
13
12
14
October
7.5
7
7
6
10
November
2.7
7
4
3
2
December
0.8
3
0
2
-1
Average
8.0
9.5
8.3
8.0
7.5
7.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
28.4
33
8
41
21
25
February
24.7
9
29
21
44
22
March
18.1
10
19
31
19
6
April
10.4
1
20
9
22
4
May
9.0
4
9
10
8
9
June
3.5
0
3
8
5
3
July
2.8
3
5
1
3
2
August
1.8
1
0
1
5
1
September
4.5
2
7
7
2
October
8.0
3
16
9
5
November
15.8
31
9
7
13
December
21.2
27
14
24
15
Average
10.7
6.2
11.5
12.6
12.9
7.6
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
7.6
8
6
8
6
7
February
9.4
11
11
8
9
10
March
9.3
8
9
11
10
9
April
8.6
9
9
10
7
8
May
7.8
9
7
9
8
9
June
7.2
7
8
7
7
6
July
7.4
9
8
7
8
6
August
7.9
8
8
7
6
7
September
7.7
8
7
8
6
October
7.3
8
8
9
6
November
7.6
10
8
7
6
December
7.4
10
9
7
8
Average
7.9
8.5
8.2
8.2
7.7
7.3
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
197°
094°
231°
130°
250°
February
179°
233°
223°
269°
219°
March
094°
239°
050°
241°
078°
April
185°
170°
226°
238°
283°
May
077°
065°
242°
228°
231°
June
235°
039°
060°
216°
114°
July
067°
252°
207°
090°
052°
August
104°
063°
089°
151°
067°
September
071°
239°
086°
063°
October
225°
257°
074°
086°
November
218°
088°
090°
045°
December
201°
077°
192°
066°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.