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
80.1
79
87
66
78
76
February
91.3
88
91
95
87
95
March
95.2
92
95
96
99
99
April
97.4
99
98
95
99
100
May
96.2
90
95
99
98
99
June
98.2
98
100
97
98
99
July
98.9
99
99
99
97
100
August
97.5
98
91
99
100
99
September
95.4
97
92
96
96
October
91.3
94
88
89
95
November
80.6
93
81
71
74
December
76.4
78
64
71
83
Average
92.3
93.8
93.5
91.5
92.3
94.6
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
5.2
6
6
6
4
7
February
8.3
11
8
9
9
9
March
11.3
13
11
13
11
11
April
15.6
16
13
14
13
19
May
19.0
20
20
22
16
20
June
24.7
23
27
26
25
23
July
25.7
25
25
28
23
26
August
25.8
27
24
29
22
28
September
21.3
25
20
22
23
October
16.2
17
19
15
14
November
9.0
9
11
7
10
December
6.2
8
1
7
6
Average
15.5
17.6
16.0
16.7
14.5
16.2
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
0.0
-2
2
0
-1
0
February
-1.8
4
-1
1
-2
3
March
0.3
3
1
-2
-1
1
April
2.0
5
2
2
-1
2
May
6.0
9
5
7
5
3
June
10.4
11
9
10
12
10
July
11.5
12
11
10
12
10
August
11.9
13
13
11
11
13
September
7.5
9
8
7
8
October
5.4
5
7
4
7
November
2.3
4
4
2
2
December
1.0
3
-5
2
2
Average
5.0
6.7
5.2
4.5
4.2
4.9
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
24
22
9
24
9
February
13.5
16
9
20
15
17
March
13.0
11
23
8
9
10
April
11.8
22
16
16
7
3
May
9.9
17
5
12
15
4
June
5.4
10
1
8
5
6
July
5.5
10
10
1
8
2
August
6.8
6
17
5
7
2
September
4.8
2
8
2
2
October
10.0
18
14
6
12
November
12.3
26
13
13
3
December
18.3
25
14
10
18
Average
10.1
13.9
14.0
10.1
9.4
6.5
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
6.8
7
8
6
6
6
February
7.7
7
8
10
6
10
March
7.2
6
8
6
6
9
April
6.8
7
7
7
7
7
May
5.9
5
6
6
7
6
June
5.1
5
6
5
4
6
July
5.3
5
8
5
5
6
August
5.2
5
6
5
5
5
September
4.9
5
5
4
4
October
5.3
6
4
5
6
November
5.3
8
5
5
4
December
5.8
7
4
5
4
Average
5.9
5.7
6.9
5.6
5.3
6.1
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
250°
231°
251°
246°
239°
February
233°
273°
239°
070°
239°
March
250°
241°
057°
266°
336°
April
254°
303°
027°
352°
006°
May
253°
040°
257°
241°
005°
June
271°
046°
261°
326°
285°
July
254°
250°
307°
260°
263°
August
254°
250°
042°
262°
228°
September
226°
253°
091°
186°
October
243°
233°
227°
233°
November
235°
234°
244°
225°
December
240°
037°
241°
218°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.