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
88.3
83
74
91
96
96
February
86.4
81
86
93
81
95
March
86.1
84
81
89
88
79
April
92.8
95
97
93
92
May
87.0
91
88
86
89
June
96.0
91
95
97
99
July
93.5
88
96
94
90
August
96.0
98
96
97
98
September
89.4
95
90
79
94
October
90.1
85
98
99
90
November
91.0
88
97
100
96
December
91.2
88
87
100
86
Average
89.9
82.5
88.3
93.2
92.1
91.8
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
6.3
2
2
7
7
9
February
7.3
12
4
6
3
8
March
13.6
14
10
13
14
14
April
19.3
21
20
18
20
May
23.1
23
25
21
25
June
30.2
27
32
30
34
July
32.4
31
34
33
33
August
31.4
31
32
34
34
September
28.9
29
30
31
28
October
19.5
20
22
22
19
November
13.9
15
12
17
17
December
8.9
9
9
13
8
Average
18.3
9.2
18.7
20.5
20.1
20.6
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
-8.4
-10
-8
-8
-6
-7
February
-8.8
-3
-8
-9
-10
-7
March
-3.5
-4
-5
-3
0
-1
April
1.5
2
1
2
1
May
8.4
10
8
9
9
June
14.2
14
15
16
15
July
16.9
16
19
17
17
August
15.7
15
16
16
16
September
11.4
11
12
12
9
October
2.7
3
4
4
2
November
-3.6
-3
-4
-1
-1
December
-6.1
-5
-8
-5
-6
Average
2.7
-6.3
3.6
3.8
4.6
4.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.9
9
13
9
2
1
February
5.3
4
10
8
7
4
March
4.0
5
4
7
6
3
April
2.9
1
0
1
3
May
3.3
1
6
5
1
June
1.5
5
1
0
3
July
0.9
0
2
1
1
August
0.2
0
0
1
0
September
1.6
3
1
0
3
October
3.8
6
0
0
3
November
2.9
7
4
1
0
December
3.5
4
10
1
8
Average
3.2
5.9
4.1
3.6
2.0
2.4
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
10.5
10
10
11
11
11
February
11.3
11
12
10
11
13
March
12.0
11
12
11
13
12
April
13.3
13
17
13
11
May
11.4
11
12
11
12
June
10.8
10
12
10
13
July
9.4
8
10
10
11
August
9.2
9
8
10
10
September
9.3
8
9
9
10
October
10.6
10
10
11
11
November
11.3
10
12
11
12
December
11.8
11
15
12
13
Average
10.8
10.6
10.3
11.3
10.9
11.6
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
324°
323°
299°
325°
291°
February
289°
291°
311°
213°
322°
March
359°
354°
339°
346°
201°
April
266°
305°
340°
333°
May
143°
177°
140°
106°
June
135°
186°
161°
196°
July
117°
170°
149°
154°
August
225°
144°
175°
148°
September
190°
148°
216°
323°
October
325°
277°
310°
318°
November
310°
309°
294°
235°
December
296°
293°
227°
317°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.