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
85.5
78
84
81
89
87
February
92.8
90
92
89
93
98
March
96.7
95
97
94
97
98
April
99.0
100
99
98
99
97
May
99.0
100
95
99
99
100
June
98.4
99
100
96
95
100
July
97.7
100
99
98
86
100
August
85.7
98
64
100
85
100
September
93.3
99
93
92
79
October
94.0
95
96
93
94
November
89.5
81
85
88
92
December
87.8
84
81
87
89
Average
93.9
94.4
90.1
93.2
93.2
95.0
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
2.4
0
5
2
5
3
February
4.3
7
6
7
3
7
March
11.2
12
11
13
12
10
April
16.0
17
15
14
18
16
May
23.5
22
27
18
23
23
June
26.1
25
27
25
30
24
July
31.3
36
33
32
33
29
August
31.1
26
31
34
32
29
September
24.8
26
25
27
26
October
14.9
14
16
19
14
November
6.7
7
3
7
8
December
1.8
6
-4
-2
4
Average
16.0
16.0
17.4
16.6
14.4
16.1
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
-3.0
-4
-1
-5
-1
-3
February
-3.1
0
-1
-1
-4
0
March
0.8
1
0
3
1
0
April
4.3
5
5
3
4
4
May
10.0
10
12
8
9
10
June
13.2
12
14
12
15
12
July
16.8
25
17
17
21
16
August
16.2
13
16
18
19
16
September
12.2
13
12
12
13
October
5.9
8
6
7
7
November
0.9
1
-3
3
2
December
-4.9
1
-10
-7
0
Average
5.8
6.2
6.8
5.7
4.5
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
23.6
26
22
19
26
40
February
14.8
20
23
11
13
8
March
10.2
16
10
10
13
5
April
7.3
1
5
11
3
8
May
6.6
2
14
11
7
5
June
6.0
6
9
13
2
8
July
2.7
0
1
5
1
5
August
4.0
15
7
3
7
2
September
6.2
4
8
6
6
October
10.1
17
9
9
9
November
18.8
15
32
28
22
December
18.7
15
29
28
17
Average
10.1
11.7
11.1
12.1
11.8
10.0
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
5.3
4
4
4
6
8
February
6.9
6
8
7
8
7
March
7.7
6
7
9
9
9
April
8.9
10
10
9
8
9
May
8.7
10
7
11
9
9
June
9.5
10
9
8
9
10
July
8.9
9
9
9
10
9
August
8.0
8
6
7
9
10
September
6.8
7
7
6
7
October
6.8
8
7
6
7
November
6.1
5
6
7
7
December
4.7
4
4
5
5
Average
7.6
7.5
6.9
7.4
7.9
8.1
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°
182°
285°
197°
200°
February
214°
209°
197°
201°
199°
March
198°
199°
194°
192°
199°
April
194°
191°
193°
191°
192°
May
192°
187°
190°
190°
191°
June
192°
189°
188°
188°
189°
July
190°
188°
186°
190°
188°
August
191°
189°
190°
190°
189°
September
194°
190°
193°
193°
October
196°
192°
201°
199°
November
193°
360°
195°
200°
December
188°
006°
347°
193°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.