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
83.1
88
81
78
84
93
February
81.6
87
88
89
82
88
March
92.0
80
99
95
98
93
April
96.7
98
98
96
97
96
May
96.1
92
96
99
95
97
June
98.6
100
98
98
99
96
July
99.5
100
100
100
100
100
August
99.5
100
99
100
100
99
September
98.7
100
98
99
99
October
84.5
92
87
87
80
November
80.0
91
90
72
74
December
82.4
83
86
83
84
Average
92.7
93.8
94.7
94.2
92.7
92.6
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
8.5
9
9
10
7
10
February
11.5
13
12
13
11
14
March
14.4
15
16
13
15
13
April
18.1
18
19
18
16
19
May
21.6
21
21
24
21
23
June
27.0
25
27
29
28
25
July
29.4
30
29
32
28
29
August
29.4
31
30
30
28
29
September
24.6
26
24
25
25
October
19.2
21
21
18
17
November
12.4
13
14
11
13
December
8.2
11
6
8
7
Average
18.9
20.3
19.4
20.0
17.9
18.6
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
-1.2
0
1
-2
-1
-1
February
1.7
5
2
1
2
2
March
4.6
7
6
3
4
5
April
8.0
8
7
8
7
8
May
12.4
12
13
15
10
13
June
17.3
16
17
19
18
16
July
19.5
21
20
21
19
19
August
19.1
21
19
20
18
19
September
15.0
16
15
16
15
October
10.5
13
13
9
9
November
4.4
3
5
4
4
December
0.2
2
0
-1
1
Average
9.6
11.2
9.9
10.1
8.6
9.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.0
10
4
2
13
0
February
7.4
16
4
1
3
0
March
7.9
22
1
5
2
7
April
9.0
13
3
6
8
11
May
11.4
19
19
7
7
5
June
4.4
9
6
3
1
9
July
1.8
2
2
0
3
2
August
2.2
1
5
2
1
2
September
2.6
3
5
3
1
October
7.5
6
8
6
8
November
10.7
6
6
18
0
December
7.7
5
10
4
11
Average
6.5
10.9
5.4
4.1
5.2
4.8
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
3.2
3
3
3
4
3
February
3.7
4
4
4
3
5
March
4.2
4
5
4
4
4
April
4.5
5
5
5
5
4
May
4.4
4
5
4
5
4
June
4.1
4
4
5
4
4
July
4.2
4
4
4
4
4
August
4.0
4
4
4
4
4
September
3.6
3
4
4
4
October
3.2
3
3
3
3
November
3.2
3
3
3
2
December
3.1
3
3
3
3
Average
3.9
4.0
3.9
3.9
4.0
3.8
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
254°
161°
173°
010°
184°
February
323°
165°
151°
092°
318°
March
030°
042°
070°
053°
077°
April
007°
059°
044°
060°
060°
May
044°
356°
045°
031°
060°
June
065°
027°
054°
041°
048°
July
087°
050°
061°
059°
068°
August
083°
056°
074°
066°
063°
September
057°
054°
075°
065°
October
060°
078°
064°
073°
November
178°
128°
014°
103°
December
267°
203°
194°
159°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.