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
77.3
84
88
70
77
81
February
88.3
96
86
99
85
97
March
95.1
95
98
99
98
97
April
96.5
97
96
94
97
100
May
95.9
95
95
98
97
98
June
96.3
93
100
98
98
89
July
97.2
97
99
98
95
97
August
95.9
93
94
96
95
97
September
93.7
93
95
96
94
October
87.8
93
90
84
87
November
73.7
96
80
65
61
December
76.6
89
54
70
54
Average
91.6
94.1
94.5
92.1
90.1
89.8
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
5
5
4
2
6
February
7.0
10
6
8
7
10
March
10.8
13
11
12
9
10
April
14.8
16
12
13
12
18
May
18.6
20
19
21
16
18
June
24.1
23
25
25
25
21
July
25.3
26
26
26
24
25
August
24.9
26
25
26
22
25
September
20.1
24
18
21
21
October
15.5
18
18
13
13
November
7.8
9
10
6
8
December
4.5
6
0
5
3
Average
15.0
17.3
15.4
15.5
13.4
14.7
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
-3.0
-3
-1
-2
-4
-2
February
-2.8
3
-1
-1
-3
1
March
0.1
3
1
-3
-1
-1
April
2.6
4
3
1
0
2
May
7.4
9
8
8
6
5
June
11.7
13
11
12
11
11
July
12.6
14
13
11
13
12
August
13.1
14
14
13
12
13
September
8.2
10
8
8
8
October
4.8
5
6
3
5
November
0.9
2
1
0
1
December
-1.0
-1
-4
-1
-1
Average
4.9
6.8
5.4
4.5
3.7
4.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
25.0
23
21
22
33
9
February
17.4
15
12
18
17
23
March
15.1
13
19
4
23
14
April
15.7
21
21
19
19
4
May
15.6
15
13
15
29
12
June
10.4
15
5
11
7
24
July
11.3
11
15
7
15
9
August
13.1
11
21
9
20
15
September
13.0
6
24
6
13
October
13.2
10
11
10
22
November
19.4
28
17
26
10
December
25.8
21
31
28
22
Average
15.3
14.9
15.3
14.2
18.5
14.4
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
8.2
9
8
9
8
6
February
8.4
9
10
12
5
12
March
8.9
8
10
6
8
10
April
7.6
8
7
9
7
7
May
6.4
7
7
6
9
5
June
5.9
6
6
5
6
7
July
5.7
5
7
6
5
5
August
5.4
5
6
5
6
6
September
5.3
5
7
4
5
October
6.1
6
5
6
6
November
6.5
10
6
6
5
December
7.4
9
5
7
6
Average
6.7
6.7
7.3
6.5
6.2
6.5
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
251°
252°
263°
248°
247°
February
256°
263°
256°
077°
255°
March
223°
249°
073°
269°
216°
April
260°
284°
289°
294°
022°
May
248°
059°
281°
261°
305°
June
264°
027°
288°
301°
271°
July
276°
256°
283°
273°
269°
August
291°
258°
048°
273°
259°
September
074°
258°
030°
287°
October
256°
225°
277°
250°
November
252°
248°
254°
106°
December
251°
070°
252°
181°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.