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
64.8
48
52
73
86
76
February
81.3
90
80
73
80
90
March
81.9
80
84
77
95
86
April
89.2
90
89
89
93
83
May
91.1
91
97
88
97
91
June
90.7
94
72
94
97
99
July
91.9
92
76
96
92
95
August
91.3
96
87
74
98
100
September
92.2
87
91
94
98
91
October
88.1
96
92
91
81
94
November
87.3
93
75
98
89
December
83.5
71
77
90
94
Average
86.9
86.5
82.2
84.0
92.5
91.0
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
1.4
1
4
-1
2
3
February
3.8
9
5
2
-1
3
March
8.1
10
7
9
12
10
April
14.0
17
16
12
15
13
May
20.7
24
21
22
20
19
June
26.4
28
27
27
27
28
July
27.1
27
24
28
26
29
August
26.3
28
26
23
29
28
September
24.0
24
24
23
25
23
October
17.3
21
17
17
19
15
November
9.0
11
11
9
13
December
5.1
7
4
7
4
Average
15.6
18.7
15.4
15.1
15.8
15.5
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
-5.5
-4
-1
-9
-3
-2
February
-4.0
-2
-3
-6
-8
-4
March
-1.4
1
0
-1
1
0
April
4.2
8
5
4
4
3
May
10.1
12
9
12
9
10
June
15.5
17
13
15
17
16
July
17.3
18
13
18
18
18
August
16.1
18
16
13
18
17
September
13.7
11
14
14
15
13
October
7.7
8
10
6
11
6
November
1.6
2
3
2
5
December
-2.9
2
-1
0
-2
Average
6.6
8.7
6.4
5.9
6.9
6.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
22.4
31
29
27
10
11
February
16.2
7
23
29
20
12
March
10.4
10
14
19
2
7
April
10.1
12
14
13
6
10
May
6.0
4
7
10
4
7
June
4.3
5
4
2
5
3
July
2.5
4
4
4
2
0
August
1.9
2
3
3
1
1
September
4.4
5
8
3
5
4
October
9.5
1
15
12
10
9
November
10.6
10
24
7
6
December
11.2
14
16
4
6
Average
8.4
8.0
11.8
12.7
5.8
6.1
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
8.3
9
7
9
7
8
February
8.8
8
10
9
8
9
March
8.6
9
9
9
9
8
April
8.6
9
10
10
8
8
May
7.0
7
6
8
7
7
June
6.5
7
5
6
7
7
July
5.5
5
4
6
6
6
August
5.5
5
6
5
5
6
September
5.9
5
5
6
7
7
October
7.4
7
7
8
7
7
November
8.8
8
11
9
10
December
8.8
7
9
10
9
Average
7.3
7.0
7.0
7.8
7.2
7.4
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
217°
231°
242°
207°
228°
February
238°
234°
231°
240°
264°
March
216°
247°
248°
225°
216°
April
224°
242°
207°
251°
271°
May
232°
057°
152°
250°
201°
June
226°
318°
242°
247°
222°
July
239°
258°
250°
264°
266°
August
269°
231°
233°
219°
260°
September
119°
167°
245°
239°
229°
October
229°
228°
234°
202°
216°
November
229°
231°
250°
237°
December
228°
186°
225°
245°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.