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
78.3
81
78
77
73
87
February
87.4
97
86
96
87
95
March
91.2
92
79
95
93
95
April
93.1
95
93
91
93
100
May
93.6
96
92
94
95
95
June
95.2
92
100
99
97
87
July
97.1
98
99
98
95
98
August
95.3
93
94
96
92
96
September
94.8
96
95
96
96
91
October
87.2
68
96
92
89
89
November
73.9
65
94
89
58
74
December
79.0
87
55
54
78
Average
90.4
89.7
91.8
92.2
87.7
91.6
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
3.3
4
5
5
2
6
February
6.9
11
7
8
8
10
March
10.2
13
10
11
9
10
April
13.9
15
11
12
11
18
May
17.5
19
18
20
15
17
June
23.2
22
25
24
24
20
July
24.0
25
25
25
22
24
August
23.8
25
24
25
21
24
September
19.2
19
23
17
20
20
October
15.3
15
18
18
14
13
November
7.5
8
8
10
6
9
December
4.5
7
1
5
4
Average
14.4
15.9
15.0
15.0
13.0
14.4
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
-3.2
-4
-1
-2
-4
-2
February
-1.0
3
-2
-1
-3
1
March
0.4
2
1
-3
-1
-1
April
3.1
4
3
1
-1
2
May
7.6
8
7
8
5
5
June
12.3
12
10
12
11
10
July
13.4
14
14
12
12
12
August
13.6
14
14
12
12
13
September
9.2
10
11
8
9
9
October
6.1
8
7
8
4
5
November
1.3
1
2
2
0
1
December
-2.8
-1
-4
-1
-2
Average
5.4
6.4
5.3
4.6
3.6
4.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.1
15
13
14
22
6
February
13.5
10
7
13
14
16
March
11.8
12
11
3
19
8
April
11.8
14
18
14
9
2
May
9.8
10
9
7
16
6
June
5.7
9
2
5
1
13
July
6.2
4
6
4
9
5
August
8.1
4
13
4
12
8
September
9.5
14
6
15
4
8
October
9.2
13
4
8
5
13
November
12.6
8
24
14
17
4
December
14.5
16
19
15
8
Average
10.3
9.7
9.9
8.8
11.1
7.9
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
8.2
9
8
9
8
6
February
8.1
8
9
11
6
11
March
8.3
8
9
6
8
9
April
7.6
8
8
9
7
7
May
6.6
7
7
6
9
6
June
6.2
6
7
6
6
7
July
6.0
5
7
6
5
6
August
5.7
5
7
6
6
6
September
5.5
7
5
7
5
4
October
6.2
6
7
5
6
6
November
6.3
7
9
6
6
5
December
7.1
9
4
7
5
Average
6.7
6.6
7.4
6.7
6.5
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
242°
248°
258°
238°
232°
February
248°
265°
250°
044°
243°
March
225°
243°
049°
259°
273°
April
246°
279°
313°
302°
343°
May
265°
034°
299°
249°
321°
June
259°
014°
291°
337°
261°
July
266°
244°
282°
256°
252°
August
277°
252°
026°
258°
254°
September
271°
350°
251°
351°
254°
October
334°
244°
225°
250°
233°
November
243°
241°
240°
253°
247°
December
239°
024°
243°
230°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.