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
81.0
76
77
89
87
68
February
86.8
95
96
89
78
88
March
85.1
81
88
82
90
90
April
91.3
91
89
95
91
May
89.5
97
91
90
91
June
89.1
74
93
93
94
July
93.2
91
96
95
96
August
91.8
94
89
91
96
September
85.7
78
85
93
90
October
86.7
85
89
83
90
November
91.5
95
84
99
94
December
84.7
78
84
93
90
Average
87.8
83.4
86.7
88.5
90.8
90.0
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
3.0
3
6
1
2
5
February
6.5
8
10
5
1
7
March
9.7
12
9
12
12
13
April
16.2
19
15
16
13
May
21.5
21
22
21
19
June
25.6
24
26
27
26
July
28.2
28
28
28
30
August
26.9
27
27
28
28
September
23.7
23
23
24
23
October
18.1
18
17
20
17
November
10.0
11
12
9
14
December
5.3
8
4
9
4
Average
15.2
7.6
17.0
16.4
16.5
16.5
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
-4.2
-3
0
-8
-3
-3
February
-3.7
-1
-2
-4
-5
-1
March
0.2
2
0
1
1
3
April
5.2
6
5
6
4
May
11.1
9
12
9
9
June
15.1
13
16
16
14
July
17.2
17
17
17
18
August
16.7
16
17
18
18
September
13.1
12
13
14
12
October
8.0
7
4
11
8
November
1.4
1
3
1
4
December
-2.7
1
-2
1
-2
Average
5.8
-1.3
6.7
6.3
7.1
7.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
16.6
25
20
16
11
9
February
13.0
4
7
14
17
15
March
16.4
15
28
22
8
7
April
12.2
16
17
7
14
May
10.6
11
15
13
10
June
6.5
8
6
6
3
July
5.3
4
7
5
3
August
5.2
5
7
4
6
September
8.3
11
11
8
6
October
10.9
13
13
11
9
November
9.8
7
17
3
9
December
13.7
22
18
8
9
Average
10.8
14.9
12.3
13.0
8.2
7.9
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
8.1
8
7
8
8
8
February
8.5
7
10
9
7
9
March
9.1
9
9
10
9
8
April
8.6
7
8
9
10
May
7.1
6
7
7
9
June
6.4
6
7
6
7
July
4.9
4
5
5
5
August
4.5
5
4
4
5
September
4.8
4
5
6
5
October
6.5
5
6
6
7
November
7.7
8
8
8
8
December
7.1
6
6
7
8
Average
7.0
8.2
6.2
6.8
6.7
7.2
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
272°
266°
275°
286°
275°
February
278°
266°
262°
274°
260°
March
271°
280°
266°
278°
248°
April
250°
265°
282°
284°
May
261°
214°
291°
250°
June
266°
278°
234°
247°
July
252°
246°
266°
262°
August
272°
241°
218°
259°
September
351°
277°
251°
226°
October
281°
264°
256°
258°
November
261°
247°
269°
252°
December
268°
270°
240°
267°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.