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
January
87.3
84
89
February
89.3
88
90
March
89.4
90
89
April
91.4
98
87
May
97.9
98
98
June
94.9
95
95
July
98.5
98
100
August
95.9
97
94
September
95.7
98
94
October
94.0
89
98
November
82.1
87
78
December
71.1
93
46
Average
91.0
95.5
93.1
84.3
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
January
4.5
3
6
February
7.2
9
6
March
9.7
11
9
April
12.7
15
11
May
18.7
20
18
June
22.1
21
23
July
23.6
24
23
August
24.2
26
23
September
19.9
23
16
October
16.0
15
17
November
7.9
8
8
December
3.5
6
0
Average
13.8
16.3
14.1
11.1
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
0.4
-1
2
February
2.3
4
1
March
2.6
3
2
April
4.8
6
3
May
9.3
11
8
June
12.6
12
13
July
13.9
14
14
August
14.8
15
15
September
11.3
13
9
October
8.9
9
9
November
2.9
3
3
December
-1.3
2
-4
Average
6.7
8.3
6.9
4.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
6.8
0
9
February
3.1
0
5
March
3.5
0
7
April
0.6
0
1
May
0.0
0
0
June
1.5
0
3
July
0.0
0
0
August
1.3
0
3
September
4.0
0
7
October
0.6
0
1
November
4.2
0
8
December
6.8
0
15
Average
2.9
0.0
2.2
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
January
12.8
12
13
February
11.2
11
12
March
9.7
9
10
April
8.9
9
9
May
7.2
8
7
June
7.1
8
6
July
7.9
7
9
August
7.2
7
7
September
7.6
7
9
October
9.9
10
10
November
10.2
12
9
December
9.3
12
6
Average
8.5
8.0
8.9
8.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
247°
229°
February
250°
276°
March
191°
247°
April
234°
022°
May
118°
039°
June
258°
338°
July
242°
242°
August
256°
240°
September
205°
264°
October
230°
217°
November
224°
185°
December
237°
339°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.