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
79.4
80
96
95
92
84
February
76.2
96
95
93
81
95
March
81.8
94
92
98
97
82
April
81.5
96
97
94
93
May
78.8
94
91
87
93
June
82.6
97
98
95
99
July
88.7
99
100
97
97
August
98.2
100
100
98
98
September
95.2
97
99
99
88
October
86.3
94
100
96
22
November
92.4
92
87
98
95
December
90.2
93
75
98
89
Average
86.0
90.1
95.7
95.1
94.3
86.6
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
11.3
8
14
12
10
13
February
12.9
18
15
13
6
12
March
18.9
20
17
19
20
20
April
22.3
22
25
21
22
May
26.8
26
28
24
27
June
31.9
31
33
31
33
July
34.7
34
38
32
34
August
34.3
37
35
34
34
September
30.8
33
32
33
27
October
21.0
24
25
26
5
November
17.2
19
15
19
19
December
13.6
14
13
20
13
Average
21.8
15.3
23.9
24.4
22.9
21.5
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
-2.3
-4
0
-5
0
1
February
-1.8
3
1
-3
-6
0
March
5.6
7
4
3
6
8
April
8.8
8
10
8
8
May
15.5
16
17
15
15
June
20.0
19
21
20
20
July
22.4
22
24
21
23
August
21.6
21
22
22
20
September
18.0
18
17
18
16
October
9.1
10
10
12
1
November
3.9
4
3
5
6
December
1.0
2
2
3
-1
Average
9.1
1.8
10.4
10.3
10.4
9.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.9
7
4
3
1
9
February
6.4
7
5
8
12
7
March
3.0
5
3
3
3
6
April
2.7
3
2
6
2
May
2.6
2
5
6
2
June
1.1
0
1
4
0
July
1.0
2
0
2
2
August
2.1
2
3
1
1
September
3.0
1
1
0
5
October
5.3
7
7
1
7
November
3.5
4
7
0
1
December
2.9
1
3
1
8
Average
3.4
5.8
2.6
3.7
3.1
3.9
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
9.7
5
10
11
10
11
February
10.7
8
11
12
12
11
March
11.1
8
11
13
13
10
April
11.7
11
14
11
11
May
9.5
7
12
10
10
June
9.2
8
9
9
11
July
7.9
7
9
7
9
August
8.2
8
8
8
8
September
8.5
8
8
9
8
October
8.8
9
8
10
3
November
9.7
7
10
10
10
December
9.1
5
9
9
10
Average
9.3
7.0
8.6
10.2
9.8
9.2
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°
260°
342°
333°
333°
February
286°
239°
331°
010°
328°
March
213°
008°
271°
183°
111°
April
120°
164°
132°
136°
May
133°
151°
117°
107°
June
119°
145°
155°
176°
July
163°
160°
159°
144°
August
133°
153°
169°
133°
September
142°
148°
168°
112°
October
099°
164°
172°
014°
November
175°
124°
184°
180°
December
243°
200°
196°
320°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.