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
79.0
77
66
91
80
February
88.4
75
92
95
94
March
87.0
87
78
93
91
0
April
84.4
90
81
93
70
May
95.0
94
97
92
98
June
97.8
99
100
96
96
July
94.6
97
93
91
98
August
96.6
96
99
90
100
September
96.6
93
95
100
100
October
90.7
85
89
93
96
November
80.8
89
78
71
83
December
87.3
98
79
74
93
Average
88.9
79.9
90.3
91.4
89.7
93.2
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
-6.8
-8
-5
-6
-1
February
-4.0
2
-3
-6
-9
March
2.4
1
-5
4
9
7
April
9.3
9
7
13
10
May
19.9
23
19
18
19
June
25.1
27
24
26
24
July
27.9
28
28
30
26
August
28.6
29
31
26
29
September
23.4
24
25
24
21
October
11.9
11
14
15
8
November
3.0
5
-2
6
4
December
-4.7
4
-12
-9
0
Average
9.9
-2.2
12.2
10.9
12.5
15.6
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
-15.7
-16
-14
-18
-10
February
-15.7
-8
-13
-16
-20
March
-9.0
-10
-15
-8
-4
-1
April
-3.0
-3
-4
-2
-3
May
6.0
9
7
4
5
June
11.6
13
10
13
11
July
13.1
12
13
14
13
August
13.0
13
13
14
12
September
8.4
9
9
9
7
October
0.3
1
2
2
-3
November
-8.7
-6
-11
-5
-7
December
-13.0
-8
-19
-18
-10
Average
-2.0
-12.6
0.0
-2.5
0.0
2.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.1
14
19
2
0
February
5.2
8
6
7
0
March
10.9
15
27
3
0
0
April
6.9
13
12
0
0
May
2.2
5
5
0
0
June
1.8
0
7
0
0
July
1.0
2
3
0
0
August
0.8
3
1
0
0
September
1.7
3
4
0
0
October
3.8
11
4
0
0
November
6.4
2
23
0
0
December
5.2
2
25
0
0
Average
5.3
12.6
7.3
6.8
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
9.0
9
7
11
9
February
10.6
11
11
10
11
March
11.3
11
11
13
10
0
April
12.2
12
15
11
9
May
10.7
10
11
11
11
June
10.5
8
11
11
12
July
6.6
9
8
0
9
August
9.4
10
9
9
10
September
10.4
10
10
9
12
October
11.0
11
11
10
12
November
10.5
10
12
11
10
December
8.9
9
10
9
8
Average
10.1
10.4
9.8
11.0
9.3
10.2
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
311°
334°
310°
276°
February
293°
305°
332°
309°
March
006°
074°
318°
282°
360°
April
022°
351°
331°
300°
May
086°
280°
074°
158°
June
130°
282°
342°
294°
July
315°
015°
360°
276°
August
320°
103°
018°
293°
September
125°
321°
304°
298°
October
342°
317°
336°
299°
November
282°
306°
277°
265°
December
296°
343°
321°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.