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
88
75
76
85
February
91.8
90
88
94
91
96
March
93.8
94
91
97
93
98
April
96.7
98
95
98
92
99
May
96.2
92
97
100
97
100
June
97.9
96
99
100
95
99
July
97.1
97
96
99
94
97
August
96.9
96
95
98
95
98
September
96.8
98
97
98
96
October
96.1
98
96
94
98
November
89.2
89
93
76
92
December
80.2
81
71
78
84
Average
94.2
94.0
93.8
95.2
91.3
96.0
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
6.2
6
7
7
5
8
February
9.0
11
9
10
9
10
March
11.9
13
11
14
11
12
April
15.3
15
14
15
12
19
May
19.8
21
20
21
16
20
June
24.2
21
26
24
25
23
July
24.7
24
24
25
23
23
August
24.9
25
23
28
21
28
September
21.0
24
20
21
22
October
16.5
17
18
16
15
November
10.4
10
12
9
12
December
7.2
9
3
8
8
Average
16.1
17.1
16.1
16.8
14.7
16.5
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
1.4
1
3
2
1
3
February
2.3
6
3
3
1
4
March
3.5
6
4
2
3
3
April
4.9
7
4
5
2
5
May
8.7
11
9
10
7
6
June
13.2
12
14
12
14
13
July
14.2
14
15
14
15
13
August
14.7
16
14
15
14
16
September
11.2
14
12
12
11
October
9.3
10
11
8
9
November
4.4
5
6
3
5
December
2.9
5
-1
3
3
Average
7.7
9.1
8.3
7.8
6.7
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
24.2
23
21
27
28
21
February
21.1
29
16
30
21
30
March
18.5
20
30
6
17
15
April
12.5
24
15
13
18
3
May
12.2
16
8
9
24
5
June
8.2
13
4
12
7
11
July
11.0
11
18
5
15
17
August
10.6
7
20
2
17
9
September
12.3
6
21
6
11
October
16.3
20
12
18
20
November
17.0
28
11
23
6
December
28.2
32
11
27
33
Average
14.7
16.7
16.7
12.0
17.5
13.9
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
9.7
11
11
9
9
10
February
11.0
11
9
15
10
15
March
10.0
9
11
8
9
11
April
8.5
10
9
10
7
8
May
7.4
6
8
7
10
8
June
7.5
7
8
7
6
8
July
7.8
8
10
7
7
8
August
7.6
8
8
7
8
8
September
7.6
8
7
6
7
October
9.6
9
9
10
10
November
9.1
11
10
7
9
December
9.8
12
6
9
10
Average
8.5
8.4
9.2
8.3
8.0
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
221°
214°
235°
218°
196°
February
207°
247°
224°
144°
219°
March
195°
215°
110°
251°
193°
April
225°
074°
006°
319°
031°
May
216°
018°
253°
229°
349°
June
254°
019°
262°
284°
236°
July
237°
229°
288°
243°
249°
August
224°
237°
347°
252°
218°
September
182°
225°
213°
213°
October
203°
185°
191°
197°
November
209°
183°
216°
185°
December
216°
145°
191°
175°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.