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
74.8
71
72
70
87
94
February
81.4
78
84
72
92
78
March
86.3
86
85
86
92
87
April
94.5
96
92
99
94
May
96.0
96
95
99
95
June
97.5
99
92
98
99
July
99.6
100
98
100
100
August
93.9
84
100
94
100
September
86.8
90
95
92
65
October
79.1
72
70
80
90
November
75.2
72
74
75
78
December
71.2
76
71
82
72
Average
86.3
78.4
86.1
85.5
91.4
88.4
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
10.7
12
10
11
12
12
February
11.4
13
11
12
11
13
March
14.6
15
11
17
15
15
April
18.3
17
16
22
20
May
23.4
25
21
24
23
June
27.1
28
25
30
26
July
31.4
32
31
33
31
August
32.0
33
33
32
32
September
27.1
27
29
28
29
October
20.3
20
23
18
22
November
12.9
13
11
15
13
December
9.6
12
7
9
10
Average
19.1
13.4
19.9
19.9
20.6
20.4
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
3.8
6
3
3
5
6
February
3.1
5
1
2
4
3
March
3.9
4
3
6
3
4
April
6.4
6
5
5
7
May
9.6
11
8
9
10
June
12.1
12
12
13
13
July
15.0
15
15
16
15
August
15.3
16
16
15
15
September
12.2
12
13
12
13
October
8.1
10
9
9
8
November
5.2
6
3
7
5
December
3.6
6
2
4
3
Average
7.8
4.9
8.3
8.1
8.3
8.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
17.6
37
14
8
15
18
February
17.5
24
19
6
17
10
March
15.1
19
23
12
10
9
April
14.8
19
19
4
9
May
7.0
3
11
3
13
June
5.2
1
14
4
8
July
0.5
0
3
0
0
August
1.0
3
0
0
1
September
4.4
9
2
4
3
October
7.1
9
5
12
2
November
12.9
13
20
10
11
December
15.7
19
12
28
13
Average
11.2
26.4
10.5
9.3
8.1
7.6
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
2.5
2
3
2
3
3
February
2.8
2
3
2
3
2
March
3.2
4
4
3
4
3
April
3.7
4
4
4
3
May
3.9
4
4
4
3
June
4.4
5
4
4
4
July
4.8
4
4
5
5
August
4.2
4
4
5
5
September
3.2
3
3
3
3
October
2.6
2
2
3
3
November
2.3
2
3
2
3
December
2.1
2
3
3
2
Average
3.3
2.7
3.3
3.1
3.7
3.5
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
166°
165°
198°
183°
176°
February
181°
207°
306°
210°
333°
March
171°
190°
332°
282°
312°
April
251°
224°
356°
350°
May
006°
319°
358°
353°
June
006°
003°
359°
360°
July
007°
008°
006°
006°
August
009°
006°
001°
005°
September
010°
359°
003°
001°
October
350°
356°
048°
355°
November
085°
191°
186°
191°
December
166°
148°
160°
173°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.