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
87.2
83
90
92
76
88
February
95.3
97
92
98
95
97
March
96.7
98
92
99
92
98
April
99.4
98
100
100
100
100
May
98.5
97
98
99
99
June
100.0
100
100
100
100
July
97.8
99
98
100
100
August
85.9
88
93
71
98
September
88.7
99
100
78
84
October
97.8
97
100
97
98
November
92.8
94
93
81
93
December
86.4
85
87
84
85
Average
94.1
93.8
94.6
96.7
89.9
95.4
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
8.5
9
8
11
8
9
February
10.8
11
10
14
11
14
March
13.6
14
9
18
14
15
April
18.5
19
18
17
22
21
May
24.3
24
23
26
25
June
29.4
29
29
32
29
July
35.0
36
36
37
34
August
34.2
34
36
34
34
September
28.0
27
31
29
32
October
21.7
22
26
19
25
November
12.5
13
10
12
12
December
7.1
9
5
6
7
Average
19.5
13.0
20.0
21.7
20.9
21.2
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
-2.6
1
-1
-3
-1
0
February
-3.3
0
-4
-6
-2
-4
March
-1.5
1
-2
1
-2
-1
April
2.3
2
2
1
1
3
May
6.1
8
4
5
7
June
10.5
10
11
13
11
July
14.6
15
16
17
14
August
13.6
14
15
13
14
September
8.8
9
11
9
11
October
2.9
4
5
4
3
November
-1.3
0
-3
1
-1
December
-3.9
0
-3
-2
-3
Average
3.9
0.8
4.6
4.3
4.9
4.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.5
18
8
2
7
8
February
8.7
12
12
2
9
1
March
8.1
12
17
3
1
5
April
5.2
5
4
5
2
1
May
4.0
6
6
0
6
June
1.5
1
4
1
1
July
0.5
0
1
1
0
August
0.9
2
2
0
1
September
1.8
4
1
3
0
October
2.6
6
0
5
2
November
7.0
5
6
5
8
December
8.0
12
5
11
4
Average
5.3
11.7
6.1
2.9
3.3
2.9
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
5.7
7
8
4
6
4
February
5.9
6
7
4
5
4
March
6.5
7
8
6
8
5
April
5.8
4
6
7
5
5
May
5.6
5
6
6
6
June
5.5
5
6
6
6
July
4.1
4
4
4
4
August
3.9
4
4
5
4
September
3.9
5
4
3
4
October
4.2
5
2
7
4
November
4.1
4
5
4
4
December
4.3
4
4
6
3
Average
5.1
5.9
5.2
4.8
5.4
4.4
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
173°
176°
181°
181°
248°
February
191°
208°
345°
330°
358°
March
199°
191°
360°
182°
222°
April
348°
242°
285°
356°
005°
May
005°
295°
351°
202°
June
347°
338°
295°
352°
July
354°
287°
356°
359°
August
006°
217°
355°
348°
September
021°
192°
332°
354°
October
285°
355°
176°
340°
November
223°
198°
206°
289°
December
186°
189°
184°
192°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.