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
83.0
74
78
92
91
78
February
82.2
92
79
86
79
87
March
90.8
94
82
92
98
81
April
91.8
89
88
96
87
May
92.7
89
91
93
94
June
94.3
93
93
94
98
July
93.4
84
96
96
97
August
94.2
95
92
95
97
September
93.0
94
90
96
92
October
85.8
76
85
93
88
November
84.7
87
70
94
94
December
82.2
84
57
84
85
Average
89.2
86.9
86.0
87.1
92.7
90.1
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
13.0
10
16
14
13
14
February
15.4
19
17
15
9
15
March
20.4
21
20
21
21
21
April
23.1
23
24
22
22
May
27.8
28
30
26
27
June
31.8
32
33
31
32
July
33.7
33
37
33
33
August
33.4
36
35
33
32
September
31.0
31
33
32
28
October
24.5
24
26
26
23
November
18.4
18
17
19
20
December
15.0
14
14
20
14
Average
23.1
16.4
24.4
25.3
23.9
23.4
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
0.8
-2
2
-2
2
4
February
3.6
5
5
0
0
3
March
7.3
8
6
5
8
10
April
10.5
10
12
10
11
May
15.9
12
18
16
15
June
20.0
17
21
21
20
July
20.7
10
23
22
23
August
22.1
22
23
23
21
September
18.5
18
17
18
19
October
10.7
10
5
13
12
November
4.7
5
2
4
7
December
3.2
2
4
8
1
Average
10.6
3.7
10.0
10.9
12.1
12.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.0
13
9
11
6
11
February
10.9
7
14
17
9
10
March
6.2
9
7
9
3
10
April
4.8
4
6
5
5
May
5.2
2
3
7
11
June
3.1
3
2
5
4
July
1.8
2
1
2
1
August
3.9
1
8
2
6
September
3.5
4
1
2
6
October
7.0
13
7
4
5
November
7.3
8
9
3
1
December
7.9
6
15
5
14
Average
6.0
9.7
5.8
6.7
4.1
6.9
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
5.6
6
5
6
6
5
February
5.3
6
2
5
5
6
March
5.3
5
0
7
6
6
April
5.2
0
7
6
5
May
5.1
4
6
5
6
June
4.4
4
4
4
5
July
4.1
4
5
4
4
August
4.1
4
5
4
4
September
4.0
4
4
4
4
October
4.6
4
4
5
4
November
4.4
4
4
4
5
December
4.9
5
4
5
5
Average
4.8
5.4
3.1
5.0
4.9
4.9
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
006°
259°
334°
301°
072°
February
204°
118°
307°
061°
296°
March
167°
360°
216°
159°
129°
April
360°
156°
133°
116°
May
137°
168°
124°
112°
June
146°
138°
171°
171°
July
208°
187°
194°
174°
August
159°
115°
171°
098°
September
109°
151°
114°
083°
October
126°
195°
248°
113°
November
118°
084°
114°
109°
December
285°
139°
198°
235°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.