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
76.1
82
78
84
73
84
February
87.0
93
94
99
88
93
March
90.8
88
94
95
91
93
April
92.0
93
88
91
94
98
May
92.5
95
90
95
94
94
June
95.5
95
99
98
95
88
July
97.2
98
99
98
94
98
August
95.1
94
95
92
94
97
September
94.4
97
94
96
91
October
89.4
95
93
86
90
November
74.3
84
90
57
76
December
77.4
90
50
74
76
Average
90.3
92.9
92.7
92.4
88.2
91.1
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
2.7
4
4
4
1
5
February
6.3
9
6
7
8
9
March
9.7
12
10
11
9
9
April
13.5
14
11
12
11
17
May
17.3
18
17
19
14
17
June
22.9
22
25
24
23
20
July
23.9
24
24
25
22
24
August
23.5
25
23
23
20
24
September
19.4
23
17
20
20
October
14.8
16
17
13
13
November
7.2
7
9
5
9
December
3.9
6
0
4
4
Average
14.0
16.0
14.3
14.5
12.4
14.0
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
-4
-1
-3
-4
-2
February
-2.8
3
-2
0
-2
1
March
0.3
2
2
-2
-1
-1
April
2.5
3
3
2
-1
4
May
6.9
8
7
8
5
5
June
11.6
12
11
12
12
10
July
12.6
14
13
12
12
12
August
12.4
14
13
10
12
13
September
8.7
10
8
8
9
October
5.4
7
8
3
5
November
1.1
2
2
0
1
December
-2.7
0
-5
-1
-2
Average
4.8
6.3
5.4
4.5
3.5
4.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
15.4
16
11
11
20
4
February
11.2
10
9
6
13
16
March
9.7
15
10
3
10
10
April
10.8
14
16
15
9
0
May
9.3
14
7
4
15
4
June
6.9
12
3
7
6
14
July
5.7
4
3
4
10
6
August
8.1
7
13
5
14
10
September
6.6
2
12
2
7
October
6.9
5
6
4
13
November
12.1
20
7
18
4
December
16.3
23
21
14
13
Average
9.4
11.0
9.3
7.4
10.7
8.3
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
9.3
9
10
10
9
8
February
9.1
9
9
12
7
13
March
9.1
8
10
7
8
10
April
7.8
9
8
9
7
7
May
7.1
7
7
7
10
7
June
6.3
7
7
6
6
7
July
6.1
6
7
6
6
6
August
5.9
5
7
6
6
6
September
5.9
5
8
5
6
October
7.1
8
6
6
7
November
7.3
11
7
7
6
December
8.6
10
5
9
6
Average
7.3
7.2
7.9
7.3
7.0
7.2
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
233°
234°
238°
227°
226°
February
234°
248°
239°
219°
240°
March
236°
238°
055°
251°
245°
April
240°
261°
277°
319°
030°
May
249°
049°
274°
243°
014°
June
244°
046°
253°
032°
253°
July
249°
236°
268°
251°
240°
August
253°
240°
043°
247°
241°
September
183°
246°
346°
237°
October
234°
222°
244°
228°
November
236°
232°
231°
254°
December
233°
032°
225°
222°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.