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
91.7
92
85
92
93
96
February
86.6
84
85
90
85
91
March
87.3
79
78
85
97
88
April
92.7
91
95
96
92
May
94.3
93
99
97
95
June
97.9
94
98
100
99
July
99.8
100
100
100
100
August
97.2
98
97
96
100
September
95.3
93
99
100
98
October
91.4
82
95
93
86
November
93.4
98
91
99
98
December
91.4
98
96
88
95
Average
92.5
84.2
91.1
94.8
95.5
94.9
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
2.5
1
4
4
6
4
February
1.1
7
4
4
-4
4
March
8.0
8
3
11
12
10
April
13.6
14
11
14
14
May
20.1
23
18
19
20
June
26.2
23
25
32
26
July
31.9
31
33
35
31
August
30.5
31
32
30
32
September
24.8
25
28
27
26
October
14.6
14
17
17
13
November
8.1
11
3
12
10
December
3.8
8
-2
2
7
Average
14.2
5.3
15.8
15.8
16.9
16.2
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
-7.4
-9
-5
-7
-3
-5
February
-9.4
-3
-6
-8
-12
-5
March
-3.3
-2
-6
-1
-1
-2
April
1.4
1
-1
2
1
May
7.7
10
7
6
7
June
12.7
13
12
15
13
July
16.6
16
17
19
15
August
15.7
17
17
15
16
September
10.7
12
12
11
10
October
3.2
4
6
6
2
November
-2.6
0
-6
2
0
December
-6.9
-1
-12
-8
-2
Average
2.6
-5.2
4.5
3.5
4.3
4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.5
10
13
9
5
4
February
16.9
16
18
15
18
12
March
11.8
19
18
16
5
14
April
13.1
12
14
10
11
May
8.4
6
12
6
10
June
5.9
12
7
1
9
July
0.9
1
1
1
0
August
2.8
3
3
7
0
September
5.1
3
4
0
3
October
10.1
20
5
9
14
November
8.0
4
16
3
3
December
8.4
6
9
10
5
Average
8.8
15.5
9.5
8.9
5.9
6.9
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
11.9
11
11
13
11
11
February
11.0
10
13
13
11
13
March
8.9
8
8
10
10
11
April
10.0
10
12
10
11
May
8.4
7
9
8
8
June
8.2
7
8
8
9
July
7.1
7
7
8
7
August
7.7
8
8
8
7
September
8.4
8
8
8
10
October
10.1
8
9
10
11
November
11.4
11
12
12
12
December
11.3
12
10
9
13
Average
9.4
9.5
8.9
9.8
9.2
10.0
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
237°
250°
251°
261°
263°
February
260°
253°
259°
274°
249°
March
359°
002°
278°
250°
268°
April
275°
318°
292°
304°
May
042°
296°
359°
332°
June
005°
266°
321°
276°
July
242°
255°
200°
286°
August
262°
253°
266°
217°
September
231°
267°
250°
260°
October
277°
258°
254°
269°
November
243°
261°
258°
250°
December
243°
255°
249°
250°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.