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
82.9
80
95
86
85
72
February
90.3
94
86
99
91
97
March
97.6
94
99
99
99
99
April
97.2
99
96
97
97
100
May
97.5
97
97
99
98
100
June
98.6
99
100
98
97
99
July
98.7
100
98
99
97
99
August
98.4
99
100
98
97
100
September
96.5
96
99
97
94
October
89.0
90
90
82
88
November
84.0
96
83
74
65
December
78.1
83
75
85
62
Average
94.2
96.0
95.5
95.3
92.9
92.2
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
4.0
5
6
5
3
5
February
7.6
10
7
9
8
10
March
11.4
13
11
13
10
11
April
15.3
15
13
14
13
19
May
19.2
20
19
22
16
19
June
24.5
23
26
26
25
21
July
25.6
26
26
27
23
25
August
25.1
26
25
26
22
25
September
20.6
24
19
21
21
October
15.6
17
17
14
13
November
8.4
9
10
6
9
December
4.9
6
1
5
4
Average
15.5
17.2
15.8
16.1
13.9
15.2
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
-2.3
-2
0
-2
-2
-2
February
-1.4
2
-1
0
-2
1
March
1.4
4
3
0
0
1
April
3.8
4
5
4
2
4
May
8.7
9
10
11
6
7
June
12.9
13
13
13
13
12
July
13.9
15
14
14
14
13
August
14.0
16
15
14
13
14
September
10.2
12
10
11
11
October
6.2
7
9
4
6
November
2.1
3
3
2
3
December
-1.8
1
-3
0
-1
Average
6.1
7.7
6.8
6.4
5.0
5.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
14.4
15
10
10
12
6
February
9.2
8
1
7
12
16
March
9.3
14
5
1
6
9
April
9.6
10
13
13
5
2
May
10.0
17
7
5
13
4
June
5.7
11
2
4
4
7
July
6.3
7
5
5
9
4
August
8.5
5
9
6
13
10
September
7.2
4
10
3
3
October
8.6
9
8
6
8
November
12.0
20
5
15
1
December
16.6
20
22
19
5
Average
9.2
10.7
7.8
7.1
9.1
6.2
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
5.6
6
6
6
6
4
February
5.9
5
7
8
4
7
March
6.7
7
6
6
6
8
April
5.9
7
6
7
6
6
May
5.6
5
6
5
7
6
June
5.0
5
6
4
4
6
July
4.7
4
5
4
4
5
August
4.6
4
5
6
4
4
September
4.6
4
5
4
5
October
4.4
4
4
5
5
November
4.8
7
4
6
3
December
5.0
6
4
4
4
Average
5.2
5.1
5.6
5.2
5.0
5.1
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
272°
270°
249°
246°
252°
February
236°
297°
242°
074°
247°
March
212°
235°
021°
246°
347°
April
240°
228°
311°
349°
285°
May
234°
038°
289°
247°
019°
June
224°
020°
277°
284°
313°
July
230°
231°
284°
234°
240°
August
235°
235°
039°
242°
228°
September
069°
247°
343°
234°
October
241°
248°
315°
236°
November
244°
254°
309°
343°
December
239°
030°
241°
226°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.