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
91.6
88
79
91
94
97
February
89.1
83
94
90
85
95
March
90.9
94
87
93
90
90
April
94.3
97
97
95
91
96
May
92.7
90
92
92
96
June
98.3
94
99
100
100
July
96.7
91
98
96
99
August
97.5
98
99
94
100
September
96.3
96
98
98
100
October
95.1
92
99
95
97
November
94.0
95
91
95
98
December
93.2
99
76
96
99
Average
93.9
90.8
92.5
94.0
93.9
97.2
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
5.0
3
2
7
7
8
February
5.8
10
6
7
-1
7
March
12.1
14
9
13
12
13
April
17.6
19
18
18
18
18
May
21.7
24
22
21
23
June
29.8
26
31
33
32
July
33.0
31
35
34
34
August
32.0
32
34
33
35
September
28.1
28
30
30
27
October
17.8
19
20
20
17
November
12.5
14
9
16
15
December
6.9
10
1
10
9
Average
17.7
11.1
18.2
19.4
19.4
19.7
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
-9.7
-12
-8
-8
-6
-7
February
-9.7
-4
-7
-9
-12
-7
March
-3.0
-2
-4
-3
-3
-2
April
0.5
3
0
0
-1
-1
May
7.0
9
6
7
8
June
12.8
13
13
14
14
July
16.5
15
17
17
17
August
14.6
15
16
13
15
September
10.1
11
10
10
8
October
0.9
2
2
3
0
November
-4.4
-4
-6
-1
-3
December
-7.2
-5
-10
-5
-7
Average
1.9
-4.0
3.1
2.9
3.2
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
7.0
10
19
10
2
3
February
10.9
15
10
10
16
6
March
6.9
8
10
9
7
4
April
7.4
7
7
5
11
6
May
8.1
8
9
6
6
June
2.3
5
1
2
2
July
1.2
3
1
1
1
August
1.2
2
1
1
0
September
2.6
2
2
2
1
October
5.5
8
3
7
5
November
3.8
7
1
1
2
December
7.3
3
23
5
1
Average
5.7
9.8
6.7
5.3
4.9
3.1
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
8.8
8
7
10
10
10
February
10.1
9
11
12
10
11
March
10.4
10
12
11
9
11
April
11.4
12
11
15
10
10
May
9.3
9
10
9
10
June
8.0
7
8
8
9
July
7.2
7
7
8
8
August
7.1
7
7
7
7
September
7.3
7
7
7
8
October
9.2
8
9
9
9
November
8.9
8
10
10
8
December
10.1
11
11
10
10
Average
9.0
9.8
8.6
9.7
8.9
9.1
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
311°
328°
305°
309°
296°
February
300°
305°
306°
309°
302°
March
307°
321°
319°
316°
297°
April
312°
315°
305°
320°
319°
May
105°
287°
105°
102°
June
113°
297°
105°
306°
July
083°
098°
104°
125°
August
280°
082°
070°
112°
September
005°
057°
297°
312°
October
327°
310°
321°
309°
November
303°
315°
295°
287°
December
301°
310°
282°
305°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.