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
73.5
83
77
73
65
80
February
87.4
85
87
91
79
92
March
92.3
94
88
97
95
95
April
96.6
99
90
99
98
99
May
96.5
98
97
100
93
99
June
97.5
99
97
99
98
96
July
97.4
98
99
98
96
99
August
97.5
99
99
95
95
99
September
95.8
95
97
96
95
98
October
90.7
92
82
98
95
90
November
80.6
91
83
79
81
December
76.5
75
59
63
79
Average
92.4
95.2
91.6
93.8
90.1
93.8
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
4.4
4
6
5
3
7
February
6.7
10
7
8
5
9
March
10.0
13
10
11
10
10
April
14.8
16
12
13
12
17
May
19.8
23
20
21
17
18
June
25.2
23
25
26
27
25
July
25.0
25
25
26
25
24
August
25.8
27
24
27
22
28
September
21.0
23
25
18
20
22
October
15.5
15
16
18
15
14
November
8.5
8
9
8
10
December
5.0
6
0
4
6
Average
15.5
18.0
15.2
15.7
14.0
15.5
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
-1.5
-2
2
1
-1
1
February
-1.9
4
0
2
-3
3
March
1.1
3
2
-1
1
1
April
4.2
6
3
3
2
4
May
8.6
11
8
9
8
7
June
13.6
12
14
13
14
13
July
14.3
14
14
14
16
13
August
14.7
15
15
16
13
16
September
10.7
12
12
10
12
10
October
7.4
8
9
8
6
8
November
3.0
3
3
4
4
December
0.6
2
-4
-1
1
Average
6.7
8.3
6.8
6.5
5.8
6.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
24.6
19
25
29
35
15
February
18.4
20
19
25
22
25
March
15.3
11
25
0
16
12
April
10.5
11
18
12
9
1
May
7.0
7
2
5
16
9
June
6.9
9
10
4
8
7
July
8.1
11
9
6
9
9
August
7.0
2
16
6
13
7
September
8.8
10
3
13
6
7
October
13.1
9
19
8
11
16
November
12.8
18
6
18
5
December
18.2
25
15
24
8
Average
11.3
9.9
14.5
9.3
14.1
9.4
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
10.1
12
11
11
8
10
February
10.4
11
10
15
8
14
March
9.7
9
10
8
9
10
April
9.3
9
9
10
10
9
May
8.8
8
9
9
10
9
June
7.8
8
7
8
7
8
July
8.1
7
9
9
8
8
August
7.6
8
8
7
8
8
September
8.2
10
7
8
8
7
October
9.2
9
10
8
10
9
November
8.7
10
8
9
8
December
9.4
11
7
8
8
Average
8.8
8.8
8.9
8.8
8.5
8.9
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
243°
232°
263°
251°
235°
February
246°
268°
247°
131°
243°
March
171°
240°
090°
263°
242°
April
235°
009°
318°
293°
302°
May
114°
071°
270°
249°
306°
June
257°
014°
281°
329°
357°
July
248°
250°
283°
261°
269°
August
263°
247°
359°
271°
198°
September
066°
201°
239°
263°
255°
October
195°
233°
221°
217°
223°
November
228°
163°
241°
222°
December
236°
059°
231°
155°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.