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
76.2
59
75
92
71
74
February
84.7
92
88
89
82
84
March
87.5
91
90
88
87
74
April
91.6
89
97
95
94
89
May
91.2
98
84
92
87
June
95.4
91
98
97
96
July
95.0
94
93
88
97
August
95.2
92
91
98
99
September
93.2
91
95
98
87
October
90.1
91
92
84
97
November
91.3
96
90
97
94
December
83.6
69
75
84
93
Average
89.4
83.0
89.9
90.8
90.0
89.5
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
1.6
0
4
2
1
3
February
5.0
12
8
3
-3
3
March
11.2
15
10
12
13
12
April
17.2
18
20
15
18
16
May
23.6
25
25
22
21
June
29.1
30
30
29
29
July
29.9
30
30
29
31
August
28.7
29
29
30
29
September
26.5
26
26
28
24
October
18.4
19
19
20
17
November
10.2
12
12
11
14
December
6.3
8
5
9
5
Average
16.5
11.1
18.6
17.7
17.3
17.0
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
-6.0
-6
-2
-11
-5
-4
February
-5.3
-1
-3
-8
-10
-5
March
1.3
4
1
1
3
2
April
5.8
8
7
5
6
5
May
12.7
12
14
12
12
June
17.7
17
18
19
18
July
20.0
20
20
20
21
August
17.8
16
18
19
18
September
15.5
16
15
16
14
October
8.2
9
6
12
6
November
0.8
1
2
1
4
December
-3.9
2
-2
0
-4
Average
6.5
1.1
8.0
6.9
7.8
7.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.4
12
11
4
14
6
February
10.3
4
11
11
16
17
March
11.0
10
10
18
9
13
April
9.0
11
5
12
10
9
May
8.2
2
15
15
8
June
3.3
2
5
4
5
July
3.2
3
6
8
3
August
2.6
6
1
3
2
September
3.1
6
3
0
3
October
8.5
6
8
14
8
November
6.8
4
10
5
4
December
6.2
14
7
4
2
Average
7.0
9.4
6.3
8.3
8.2
6.5
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
8.1
7
8
9
7
8
February
8.5
8
9
9
8
8
March
9.2
10
9
9
10
9
April
9.3
10
10
10
9
9
May
7.6
7
8
8
8
June
6.9
6
7
7
7
July
5.8
5
6
6
6
August
6.1
6
7
6
6
September
6.3
5
7
7
7
October
7.8
8
9
7
8
November
8.5
8
10
9
10
December
7.9
7
8
9
7
Average
7.7
8.8
7.3
8.1
7.5
7.5
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
260°
257°
260°
247°
247°
February
220°
242°
242°
295°
276°
March
234°
234°
256°
165°
200°
April
223°
232°
228°
242°
263°
May
095°
170°
176°
202°
June
042°
233°
217°
198°
July
243°
226°
196°
203°
August
197°
217°
190°
198°
September
162°
247°
221°
198°
October
248°
230°
242°
232°
November
231°
227°
237°
213°
December
215°
201°
217°
249°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.