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
99.4
98
99
99
100
99
February
98.8
98
98
100
99
100
March
98.7
98
99
100
100
99
April
97.4
98
98
94
99
99
May
96.0
96
99
92
94
93
June
93.3
75
90
97
100
93
July
91.6
91
88
92
99
80
August
95.6
88
96
93
95
99
September
97.6
100
91
99
98
99
October
99.0
100
98
99
100
99
November
98.7
100
98
99
99
December
99.8
100
100
99
100
Average
97.5
95.2
96.9
97.1
98.7
97.3
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
19.3
20
22
18
20
18
February
19.9
20
19
19
22
20
March
16.3
15
16
15
18
18
April
13.2
13
13
12
15
15
May
8.6
6
11
9
9
9
June
4.7
1
6
6
5
5
July
4.8
5
3
3
7
3
August
7.6
7
6
8
10
7
September
11.0
11
9
12
13
12
October
14.7
16
14
15
16
15
November
17.6
16
20
18
19
December
19.1
18
19
20
19
Average
12.8
11.2
12.7
12.9
14.3
13.2
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
8.1
9
9
7
8
8
February
8.3
9
8
8
8
9
March
5.9
6
4
5
6
8
April
3.1
3
3
2
4
3
May
1.2
-1
2
1
2
2
June
-2.3
-4
0
-1
-2
-2
July
-2.0
0
-4
-5
1
-6
August
0.3
1
0
0
1
0
September
1.3
1
1
1
2
2
October
3.4
5
4
3
3
4
November
5.2
4
6
5
7
December
7.4
7
6
8
8
Average
3.2
2.8
3.0
2.7
3.8
3.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.4
9
2
8
4
14
February
6.1
12
7
5
4
4
March
7.8
8
5
12
5
9
April
6.6
5
6
7
4
2
May
7.3
8
4
2
9
11
June
6.4
13
10
4
2
8
July
7.0
7
7
7
8
9
August
5.5
10
9
5
3
3
September
5.5
1
11
4
5
3
October
4.1
3
5
2
2
5
November
5.4
8
2
3
6
December
5.7
6
3
3
6
Average
6.2
7.2
6.3
5.0
4.1
6.7
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
16.4
17
16
18
15
16
February
15.8
15
19
16
15
18
March
14.5
17
17
15
16
12
April
13.3
15
16
12
11
13
May
10.7
11
14
14
10
8
June
9.9
7
12
11
9
10
July
10.8
13
11
11
13
8
August
12.6
9
15
11
13
15
September
14.2
19
13
14
12
15
October
16.8
19
19
17
19
16
November
16.5
16
15
18
17
December
16.8
18
15
18
18
Average
14.5
14.9
15.9
14.5
14.6
14.5
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
255°
256°
243°
255°
252°
February
257°
257°
255°
247°
257°
March
257°
266°
251°
259°
273°
April
251°
261°
251°
295°
269°
May
245°
288°
258°
265°
275°
June
252°
269°
260°
282°
268°
July
275°
280°
275°
280°
259°
August
256°
270°
277°
278°
260°
September
265°
250°
283°
274°
259°
October
255°
253°
256°
263°
253°
November
252°
268°
251°
259°
December
240°
254°
247°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.