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
77.1
76
65
87
75
70
February
86.1
85
86
88
80
91
March
88.7
89
79
97
89
89
April
89.7
93
90
91
90
95
May
96.2
96
100
99
96
June
97.8
97
100
100
99
July
95.8
100
99
94
98
August
96.0
95
99
95
97
September
93.2
89
98
96
98
October
92.8
91
100
93
91
November
91.3
97
89
95
97
December
78.5
71
72
82
84
Average
90.2
86.3
88.8
94.5
91.5
92.9
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
-6.6
-5
-6
-7
-2
-5
February
-3.0
5
-2
-4
-9
-2
March
3.7
6
-2
3
10
6
April
11.1
15
9
7
13
12
May
21.1
24
20
21
19
June
27.5
28
27
30
29
July
28.3
27
29
29
30
August
26.1
28
27
27
28
September
22.8
25
24
25
20
October
12.8
14
17
17
10
November
4.9
9
3
7
10
December
-1.2
4
-4
-2
2
Average
11.5
5.2
13.2
12.3
13.9
13.2
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
-14.7
-12
-13
-19
-9
-13
February
-14.8
-5
-14
-17
-17
-13
March
-6.6
-5
-11
-5
-2
-3
April
0.7
4
-1
-1
1
0
May
9.1
10
9
9
9
June
16.5
18
16
17
17
July
17.5
16
18
18
18
August
15.7
16
16
16
15
September
11.6
13
12
12
7
October
3.8
5
4
7
1
November
-4.2
-3
-5
-3
-2
December
-10.9
-4
-11
-11
-9
Average
1.6
-5.4
2.6
1.8
3.2
2.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.7
10
22
11
11
15
February
8.3
5
6
7
8
7
March
7.9
10
12
4
9
5
April
11.7
14
12
21
14
3
May
6.3
4
4
4
9
June
2.6
2
2
2
3
July
2.9
2
3
3
2
August
2.5
3
3
3
1
September
4.5
5
1
7
5
October
7.7
9
4
10
5
November
9.2
7
15
6
0
December
10.8
17
23
12
11
Average
7.4
9.7
7.8
7.2
7.0
5.2
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
8.4
8
8
10
8
8
February
8.7
8
10
12
7
8
March
10.0
11
11
11
10
10
April
11.0
13
11
14
11
10
May
8.9
9
9
9
10
June
7.9
7
8
7
10
July
6.2
6
7
6
6
August
6.4
7
7
7
7
September
7.2
7
7
7
7
October
9.1
9
9
8
9
November
9.0
9
11
9
9
December
8.5
8
11
8
9
Average
8.6
10.2
8.2
9.4
8.1
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
2021
2020
January
305°
324°
321°
335°
313°
February
291°
336°
319°
281°
312°
March
339°
353°
337°
162°
339°
April
352°
342°
334°
335°
328°
May
115°
205°
258°
004°
June
082°
289°
283°
147°
July
324°
276°
136°
176°
August
360°
046°
167°
144°
September
106°
169°
228°
302°
October
316°
300°
148°
294°
November
289°
303°
299°
264°
December
300°
012°
297°
324°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.