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
88.6
94
97
84
98
82
February
95.4
98
97
97
98
98
March
97.2
99
98
100
99
99
April
99.3
100
99
97
100
100
May
99.1
98
100
100
99
99
June
99.3
99
99
100
100
100
July
99.5
100
100
100
98
100
August
99.6
99
100
100
100
100
September
99.7
100
99
100
100
October
95.7
97
94
92
96
November
91.2
98
92
91
80
December
86.8
87
83
79
87
Average
96.9
98.4
98.0
96.7
96.7
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
5.6
7
6
5
5
7
February
9.4
11
10
10
10
12
March
12.5
14
13
13
12
12
April
16.3
16
14
15
15
19
May
19.8
19
20
23
17
21
June
25.3
24
27
27
25
23
July
27.8
27
29
30
24
28
August
27.3
29
28
29
24
27
September
22.5
25
21
22
23
October
17.1
19
19
15
14
November
9.7
10
12
8
11
December
6.5
8
5
6
7
Average
16.9
18.4
17.4
17.8
15.2
16.9
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
-1.8
1
2
-1
0
-1
February
0.6
3
-1
1
1
2
March
2.8
4
4
2
2
3
April
5.3
6
5
5
4
6
May
9.4
10
11
12
7
10
June
14.3
14
15
15
15
13
July
16.0
16
17
17
15
16
August
15.4
17
17
16
14
15
September
11.7
14
11
13
12
October
8.0
10
11
6
7
November
3.5
4
5
3
4
December
1.0
2
0
0
1
Average
7.5
8.9
8.2
8.0
6.6
7.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
16.3
18
19
5
26
9
February
10.8
7
1
11
9
22
March
11.1
7
16
2
5
11
April
8.8
10
14
13
7
7
May
11.5
18
6
5
22
8
June
6.4
7
4
5
4
14
July
3.4
2
4
1
11
1
August
5.5
1
10
3
6
8
September
6.1
6
9
7
6
October
11.6
16
9
10
17
November
14.5
32
15
8
3
December
21.3
21
15
21
21
Average
9.6
8.3
11.2
6.9
10.8
9.9
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
6.0
6
7
6
6
5
February
6.2
5
5
6
7
9
March
6.6
5
8
5
7
7
April
6.6
7
7
7
8
5
May
6.3
6
7
7
6
8
June
5.5
6
5
6
5
5
July
5.7
5
6
7
6
6
August
5.3
5
6
6
6
5
September
5.4
5
6
5
6
October
5.1
6
4
5
6
November
5.1
6
5
6
4
December
5.1
5
4
4
5
Average
5.8
5.6
6.0
5.7
5.9
5.8
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
250°
335°
027°
248°
225°
February
225°
044°
208°
199°
226°
March
212°
224°
052°
064°
042°
April
247°
088°
055°
046°
075°
May
203°
042°
064°
222°
048°
June
222°
049°
128°
054°
211°
July
172°
228°
051°
092°
046°
August
065°
212°
050°
048°
093°
September
119°
202°
064°
076°
October
215°
209°
033°
239°
November
226°
221°
031°
039°
December
223°
031°
239°
234°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.