Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi 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
92.5
99
93
89
100
100
February
94.3
93
93
97
100
88
March
91.9
92
95
88
100
April
96.0
96
95
100
100
May
97.6
99
96
100
100
June
99.3
99
100
0
100
July
99.6
99
100
100
100
August
99.0
99
99
100
100
September
97.7
100
96
100
100
October
98.5
97
100
100
100
November
94.2
96
93
100
100
December
94.5
100
98
75
100
Average
93.6
94.4
97.4
95.7
79.1
98.0
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi 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
-1.4
1
-2
2
-3
-6
February
-2.9
2
0
0
-15
-4
March
2.7
4
0
6
-1
April
5.8
8
6
0
3
May
13.2
17
12
2
15
June
16.9
17
21
4
16
July
24.0
26
28
25
18
August
22.6
24
26
11
22
September
16.5
20
21
20
8
October
9.3
12
12
2
7
November
2.4
5
2
8
2
December
-2.7
4
-2
-3
-2
Average
6.4
2.2
10.5
11.5
2.2
8.0
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
-8.0
-10
-10
-8
-3
-6
February
-8.3
-7
-10
-10
-16
-4
March
-6.7
-6
-11
-4
-2
April
-3.3
-4
-5
0
3
May
4.2
3
1
2
15
June
8.4
6
6
4
16
July
12.8
9
10
25
17
August
13.7
10
10
11
22
September
7.4
5
6
20
8
October
1.3
0
0
2
5
November
-5.9
-4
-8
8
2
December
-7.0
-5
-10
-8
-5
Average
1.5
-8.2
-2.8
-1.3
0.2
7.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.0
2
11
9
0
0
February
6.2
9
8
3
100
13
March
7.4
10
7
6
0
April
7.8
6
11
0
33
May
5.6
4
8
0
17
June
8.7
13
3
0
13
July
2.2
3
2
0
0
August
7.9
10
7
0
0
September
5.6
5
6
0
0
October
4.8
8
2
0
0
November
11.9
8
14
0
100
December
7.8
3
5
31
0
Average
9.2
6.8
7.3
6.2
27.7
12.0
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
12.7
12
12
14
5
13
February
14.5
12
15
16
0
16
March
11.6
10
11
14
12
April
12.6
13
13
0
15
May
10.1
10
11
22
8
June
9.0
7
11
0
14
July
10.0
10
10
8
10
August
9.1
9
9
12
7
September
9.3
9
9
12
12
October
11.0
10
12
7
17
November
12.3
13
12
15
8
December
12.2
10
15
11
10
Average
11.0
11.5
10.4
12.2
10.9
11.5
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
306°
307°
304°
180°
318°
February
298°
295°
300°
360°
301°
March
290°
292°
299°
247°
April
303°
297°
360°
280°
May
296°
289°
289°
138°
June
282°
290°
360°
274°
July
291°
300°
090°
271°
August
291°
306°
300°
315°
September
291°
288°
318°
262°
October
293°
300°
296°
277°
November
301°
297°
351°
318°
December
298°
303°
301°
319°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.