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
89.5
78
88
96
90
93
February
89.1
90
96
96
85
93
March
90.5
90
91
98
91
82
April
93.6
93
97
94
96
May
90.5
88
92
87
92
June
97.2
94
97
95
99
July
95.7
96
93
96
96
August
96.5
100
99
100
95
September
94.0
94
95
0
93
October
94.2
98
98
99
93
November
92.8
95
96
97
96
December
93.5
89
94
98
92
Average
92.4
86.4
93.2
95.9
92.8
93.4
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
8.2
4
8
10
9
10
February
9.5
14
13
10
4
9
March
16.4
18
16
17
16
17
April
21.1
22
22
20
22
May
24.0
26
28
24
26
June
32.1
28
33
32
35
July
33.5
33
36
32
33
August
32.3
33
35
28
32
September
29.7
30
32
23
28
October
21.3
23
24
22
21
November
14.9
16
13
17
17
December
10.4
11
10
15
8
Average
20.2
11.9
21.4
22.7
19.2
21.6
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
-7.7
-7
-6
-9
-5
-5
February
-7.9
-1
-6
-8
-10
-4
March
0.2
0
-1
-2
1
2
April
4.2
5
5
3
3
May
10.2
12
11
11
11
June
17.0
16
18
18
18
July
19.3
20
20
18
20
August
17.9
18
18
23
17
September
14.2
14
14
23
11
October
5.2
6
6
6
4
November
-1.1
-1
-2
1
1
December
-5.2
-3
-6
-4
-5
Average
5.0
-3.2
6.3
5.9
4.2
6.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.1
6
13
4
2
3
February
7.3
4
4
5
21
7
March
5.0
4
2
5
10
5
April
3.8
5
1
2
2
May
4.0
4
4
5
3
June
2.9
7
4
1
3
July
2.0
1
4
2
1
August
1.1
0
2
0
1
September
3.0
3
2
0
5
October
4.0
1
2
3
4
November
2.5
4
5
1
1
December
3.8
9
0
0
8
Average
3.7
4.3
4.3
2.9
4.4
3.3
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
10.7
10
11
12
12
10
February
11.4
12
13
13
8
12
March
13.2
12
13
15
14
12
April
13.9
13
16
14
13
May
12.3
13
14
13
13
June
11.9
10
12
10
15
July
9.8
10
10
11
10
August
9.4
9
9
7
10
September
10.9
9
10
0
10
October
11.2
11
10
13
10
November
11.3
10
13
11
12
December
11.3
11
14
11
11
Average
11.4
11.0
11.0
11.7
11.7
11.5
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
316°
323°
334°
329°
338°
February
290°
314°
348°
029°
332°
March
005°
323°
342°
258°
172°
April
230°
288°
341°
335°
May
147°
158°
146°
099°
June
138°
173°
158°
189°
July
176°
148°
151°
138°
August
156°
158°
215°
151°
September
163°
160°
360°
100°
October
297°
227°
305°
040°
November
345°
272°
321°
211°
December
317°
279°
246°
318°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.