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
90.3
77
96
96
93
84
February
88.3
94
99
94
78
94
March
92.0
93
95
97
92
81
April
93.3
92
98
93
97
May
92.5
91
91
86
95
June
96.8
97
96
92
99
July
99.1
99
100
98
100
August
97.8
100
98
98
98
September
95.0
97
100
100
92
October
93.7
96
100
96
83
November
91.5
89
86
94
50
December
92.2
92
77
99
0
Average
93.1
88.0
95.2
95.3
93.3
92.6
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
10.5
7
13
12
9
12
February
12.0
16
14
12
4
12
March
18.4
19
18
19
19
19
April
22.2
23
25
21
22
May
26.9
27
29
24
27
June
30.2
31
33
32
33
July
33.4
35
38
32
35
August
33.6
36
35
33
34
September
30.3
32
32
32
28
October
22.8
24
24
25
21
November
15.7
17
14
18
13
December
12.6
13
12
19
2
Average
21.6
14.3
23.5
24.1
22.7
23.7
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
-2.2
-4
0
-5
0
0
February
-1.3
3
0
-3
-6
0
March
4.9
6
3
3
6
7
April
8.4
8
10
8
8
May
14.9
16
16
14
14
June
18.1
19
21
20
20
July
21.2
22
24
21
22
August
21.3
22
22
22
21
September
17.9
19
17
19
14
October
10.0
11
10
12
8
November
3.7
5
3
5
13
December
0.9
2
2
2
2
Average
9.1
1.5
10.4
10.3
10.4
11.3
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
3.6
6
4
4
1
6
February
5.5
7
3
7
12
5
March
3.3
5
2
3
5
6
April
3.5
4
0
3
1
May
3.1
6
4
4
2
June
1.9
1
1
6
0
July
1.2
1
2
1
2
August
2.0
1
4
1
2
September
3.5
2
1
0
5
October
3.9
4
3
1
6
November
3.1
3
9
1
50
December
1.9
3
3
0
0
Average
3.3
5.9
2.7
3.2
2.9
3.3
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
9.5
9
10
10
11
9
February
10.3
11
11
11
11
9
March
11.1
11
12
13
13
9
April
11.8
12
15
12
10
May
9.8
8
13
11
9
June
9.6
8
11
9
11
July
7.8
9
9
8
8
August
7.8
8
8
9
8
September
8.6
9
9
10
8
October
9.7
11
9
10
10
November
9.3
9
10
10
17
December
9.0
10
9
10
0
Average
9.6
10.4
9.5
10.6
10.3
9.0
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
319°
261°
335°
327°
303°
February
252°
234°
324°
025°
330°
March
213°
019°
267°
204°
141°
April
180°
182°
177°
182°
May
146°
165°
137°
114°
June
137°
167°
170°
184°
July
183°
173°
169°
150°
August
151°
169°
175°
146°
September
163°
176°
182°
176°
October
204°
211°
212°
161°
November
206°
217°
211°
171°
December
268°
224°
211°
360°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.