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
63.4
59
74
68
67
72
February
75.6
71
76
80
73
83
March
87.2
85
80
92
93
95
April
95.8
96
92
100
95
May
97.6
98
98
100
93
June
98.2
99
99
96
98
July
98.2
100
99
100
100
August
95.1
99
96
91
100
September
88.3
98
90
94
67
October
90.5
81
89
90
98
November
74.9
67
81
68
71
December
53.7
63
61
45
47
Average
84.8
71.9
86.8
88.9
86.1
86.4
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
9.6
10
9
11
9
10
February
11.1
12
10
14
10
14
March
14.6
15
11
17
15
15
April
19.3
18
16
23
22
May
24.5
25
22
25
24
June
28.7
30
28
31
27
July
33.5
34
34
35
33
August
33.7
35
35
33
33
September
28.2
27
30
30
31
October
21.7
21
25
19
24
November
12.4
12
10
12
12
December
7.5
10
5
6
8
Average
19.7
12.3
20.0
20.9
20.7
20.9
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
2.5
5
1
0
2
4
February
0.4
4
-1
-1
1
0
March
1.7
3
1
3
1
2
April
4.9
5
3
3
6
May
8.5
10
7
8
9
June
11.6
11
11
14
12
July
14.9
15
15
16
14
August
14.7
17
15
15
14
September
10.9
11
13
10
12
October
5.8
7
7
7
6
November
2.8
4
1
5
3
December
2.0
4
0
3
2
Average
6.5
3.7
6.8
6.4
7.0
6.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.1
21
16
4
17
9
February
12.6
14
11
2
7
0
March
14.7
16
16
2
2
4
April
11.5
4
8
0
2
May
4.7
1
4
1
7
June
2.2
1
4
2
2
July
2.2
0
0
0
0
August
0.8
0
0
0
1
September
2.3
4
1
2
0
October
3.9
5
2
6
1
November
10.0
8
7
5
8
December
9.7
12
10
17
11
Average
7.9
17.3
6.2
3.2
4.5
3.5
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
0.8
1
1
1
1
1
February
1.3
1
2
1
1
1
March
1.9
2
2
2
2
2
April
2.5
2
2
3
3
May
3.1
4
3
4
2
June
3.2
3
3
3
4
July
3.4
3
3
4
4
August
2.8
3
2
4
4
September
2.1
2
2
2
2
October
1.4
1
0
2
2
November
0.8
1
1
1
1
December
0.6
1
1
1
0
Average
2.0
1.2
2.2
1.9
2.4
2.1
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
180°
139°
132°
025°
281°
February
347°
327°
332°
356°
341°
March
328°
229°
330°
334°
273°
April
283°
329°
343°
347°
May
341°
323°
340°
336°
June
340°
334°
338°
341°
July
339°
338°
336°
342°
August
341°
340°
342°
341°
September
336°
332°
336°
050°
October
338°
351°
341°
348°
November
345°
327°
325°
022°
December
122°
210°
065°
180°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.