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
84.8
90
77
84
84
93
February
89.8
92
88
100
88
98
March
93.7
92
93
93
92
97
April
94.8
98
89
93
95
100
May
96.1
96
95
99
99
97
June
97.1
97
98
98
95
95
July
98.3
99
100
99
97
99
August
97.4
96
96
99
95
99
September
95.6
98
96
93
99
October
93.5
94
97
94
93
November
81.2
93
80
85
91
December
87.4
92
60
83
90
Average
93.8
95.5
93.6
94.0
92.8
96.4
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
3.5
4
5
5
2
6
February
6.1
10
6
7
5
8
March
9.5
12
9
10
9
9
April
13.4
15
11
11
10
16
May
17.8
19
18
20
15
17
June
23.2
22
24
24
24
21
July
24.0
24
24
25
23
23
August
24.3
26
23
26
20
25
September
19.7
23
18
20
21
October
14.8
16
17
14
13
November
7.6
8
9
7
9
December
4.8
6
0
4
5
Average
14.3
16.3
14.4
14.8
12.7
14.3
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
-1.0
-2
1
1
-2
0
February
-1.8
4
0
1
-3
2
March
1.0
2
2
-1
0
1
April
3.5
6
3
3
1
3
May
7.8
10
7
9
6
5
June
12.4
12
12
12
14
12
July
13.2
14
14
13
13
12
August
13.8
15
14
14
12
15
September
9.5
12
9
11
9
October
7.4
9
9
5
8
November
2.3
3
3
2
2
December
0.4
2
-4
-1
1
Average
6.0
7.6
6.5
5.9
4.9
5.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
23.5
16
22
26
40
8
February
15.4
12
16
20
26
24
March
17.4
10
25
6
19
18
April
10.9
12
15
14
12
4
May
10.5
16
7
5
18
10
June
7.7
8
9
4
10
17
July
9.0
11
10
9
10
9
August
8.8
5
14
5
16
10
September
8.8
3
15
3
7
October
12.9
14
7
10
18
November
14.9
22
9
21
4
December
18.3
24
25
18
8
Average
12.2
11.0
13.9
10.5
15.4
11.3
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
10.3
11
11
11
9
10
February
10.5
11
10
15
7
15
March
9.7
8
11
6
9
11
April
8.6
10
8
9
9
8
May
7.3
6
7
7
10
7
June
7.1
8
7
7
6
7
July
7.8
7
10
8
7
8
August
7.3
7
8
6
8
7
September
7.2
6
8
7
7
October
9.2
9
8
9
10
November
8.4
12
7
8
8
December
9.6
12
6
8
8
Average
8.3
8.2
8.8
8.0
8.0
8.5
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°
224°
258°
246°
227°
February
235°
264°
238°
222°
234°
March
233°
235°
063°
257°
237°
April
239°
337°
315°
299°
336°
May
091°
025°
280°
241°
311°
June
265°
001°
290°
298°
258°
July
246°
242°
290°
247°
258°
August
254°
242°
003°
258°
253°
September
211°
258°
256°
249°
October
230°
222°
227°
229°
November
231°
214°
238°
224°
December
236°
256°
235°
203°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.