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
83.8
61
80
91
88
88
February
91.5
86
97
100
95
95
March
90.8
93
92
94
88
79
April
96.1
96
100
99
94
97
May
90.9
92
90
94
89
June
98.6
100
98
96
99
July
96.0
94
92
97
96
August
96.4
98
97
96
98
September
93.0
90
95
97
92
October
92.8
98
97
94
95
November
91.9
86
93
98
97
December
92.5
86
87
99
93
Average
92.3
84.1
93.0
94.6
94.7
93.1
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
5.7
1
5
7
7
6
February
8.6
14
10
9
3
9
March
14.6
16
12
15
16
15
April
20.2
22
21
20
20
21
May
24.4
26
25
23
23
June
30.8
30
32
26
33
July
33.1
33
35
33
32
August
32.1
33
35
34
32
September
29.2
30
31
30
27
October
20.3
22
23
22
19
November
13.8
16
12
15
16
December
8.9
9
7
12
10
Average
19.3
13.1
20.4
21.3
20.1
20.2
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
-7.4
-9
-7
-9
-5
-4
February
-7.8
-2
-7
-8
-11
-5
March
-1.8
0
-2
-2
2
2
April
4.3
6
4
5
4
3
May
10.9
12
11
10
10
June
16.6
16
17
12
19
July
19.6
19
20
19
20
August
18.2
18
18
19
18
September
14.9
14
14
16
12
October
5.5
7
5
7
4
November
-1.2
1
-3
1
1
December
-5.2
-3
-7
-4
-5
Average
5.1
-2.6
6.1
5.6
5.9
6.2
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
18
13
11
2
7
February
7.7
4
5
2
15
6
March
4.2
6
4
7
8
1
April
3.3
1
2
0
3
2
May
3.9
3
11
2
3
June
1.7
3
4
1
1
July
1.4
3
3
2
0
August
0.8
0
1
0
1
September
2.2
6
1
1
5
October
2.8
1
5
3
1
November
4.5
8
6
3
1
December
5.0
14
4
0
4
Average
4.0
7.2
4.9
4.5
2.9
2.5
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
10.0
10
9
10
11
10
February
11.2
11
12
13
11
11
March
12.9
13
13
13
14
12
April
14.0
15
14
16
13
13
May
11.0
10
12
12
12
June
11.1
9
12
10
14
July
9.6
9
10
10
10
August
9.4
9
9
11
10
September
11.0
10
10
11
10
October
11.3
13
10
11
11
November
11.1
11
13
11
12
December
10.4
10
12
10
10
Average
11.2
12.3
10.5
11.5
11.0
11.2
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
331°
333°
311°
327°
339°
February
303°
296°
331°
037°
330°
March
009°
340°
346°
318°
186°
April
313°
261°
268°
293°
346°
May
148°
074°
146°
075°
June
115°
164°
153°
182°
July
097°
137°
153°
144°
August
165°
142°
166°
161°
September
152°
144°
156°
080°
October
290°
263°
324°
011°
November
317°
290°
279°
224°
December
310°
262°
282°
327°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.