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
75.5
83
85
65
76
70
February
84.8
81
85
89
74
91
March
89.8
90
86
92
92
94
April
94.0
97
91
95
90
100
May
94.1
89
93
98
94
100
June
95.6
95
99
98
92
98
July
95.0
95
93
97
89
94
August
94.7
95
90
97
92
96
September
92.1
93
93
94
92
October
91.2
92
93
86
92
November
81.5
83
89
73
87
December
70.7
71
75
69
83
Average
90.1
91.3
89.6
92.2
87.0
90.4
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
6.1
6
8
7
4
8
February
8.7
11
9
10
7
10
March
11.5
13
11
13
9
11
April
14.4
15
13
14
10
15
May
19.5
21
19
21
16
19
June
23.5
21
26
23
24
23
July
24.2
23
24
25
23
23
August
24.4
25
23
27
21
27
September
20.6
23
20
21
22
October
16.3
17
18
15
15
November
10.1
10
12
9
11
December
7.2
9
3
7
8
Average
15.8
16.8
15.8
16.3
14.5
15.9
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
2.0
1
4
3
1
4
February
2.7
6
3
4
1
4
March
4.2
6
4
2
6
5
April
6.0
8
5
5
5
11
May
10.1
12
9
10
8
18
June
14.0
12
14
13
14
20
July
14.2
14
14
14
15
13
August
14.7
16
14
15
14
16
September
11.4
14
11
12
11
October
9.4
10
10
8
9
November
4.7
5
6
4
6
December
3.2
5
-1
3
4
Average
8.3
9.2
8.4
7.8
8.0
9.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.3
15
19
15
6
14
February
15.5
23
12
20
17
23
March
12.4
14
23
3
6
9
April
7.5
15
12
6
7
8
May
5.8
10
5
2
11
3
June
4.7
11
3
4
4
2
July
6.3
7
10
4
10
9
August
5.2
4
12
2
6
5
September
7.5
5
17
4
6
October
11.0
15
8
12
11
November
12.5
21
10
7
6
December
19.0
22
12
8
24
Average
9.2
11.4
11.9
7.3
7.7
10.3
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
8.0
9
9
8
6
8
February
9.1
9
8
12
7
13
March
8.1
8
8
6
9
9
April
6.9
9
7
7
5
8
May
6.0
6
5
6
8
6
June
5.9
6
5
6
5
7
July
6.3
7
8
6
6
7
August
6.2
6
6
5
6
7
September
6.1
6
6
5
6
October
7.6
8
7
8
8
November
7.1
9
7
6
7
December
7.9
10
5
7
8
Average
6.9
7.2
7.2
6.5
6.3
7.9
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
219°
225°
243°
232°
213°
February
204°
250°
233°
135°
230°
March
185°
228°
109°
256°
217°
April
220°
223°
288°
336°
232°
May
209°
015°
253°
236°
274°
June
249°
023°
247°
273°
210°
July
224°
236°
271°
237°
248°
August
208°
249°
288°
244°
220°
September
185°
230°
216°
220°
October
210°
199°
205°
203°
November
206°
189°
224°
195°
December
218°
163°
208°
177°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.