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
80.0
94
0
96
92
93
February
89.1
91
36
90
91
87
March
88.0
87
88
91
94
83
April
88.7
95
83
92
86
May
89.4
89
93
90
94
June
96.1
90
100
100
100
July
99.3
99
99
99
99
August
95.4
96
100
98
80
September
91.8
96
99
99
0
October
89.4
88
91
88
November
85.1
98
51
98
100
December
82.5
99
0
91
93
Average
89.9
90.5
85.7
86.6
94.5
88.4
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
1.8
1
0
3
4
3
February
1.0
8
1
2
-3
2
March
7.5
8
3
9
11
7
April
12.0
12
10
13
12
May
18.1
22
17
19
19
June
24.6
23
24
30
26
July
28.3
28
31
32
30
August
28.1
28
31
30
27
September
22.8
25
26
27
0
October
13.7
13
16
16
November
7.2
10
2
11
2
December
3.1
7
0
3
5
Average
13.0
5.7
14.9
14.5
15.9
14.3
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
-7.5
-10
0
-7
-4
-6
February
-10.7
-4
-2
-9
-13
-6
March
-4.6
-3
-6
-4
-1
-3
April
0.2
0
-2
0
0
May
6.0
9
6
5
6
June
11.6
12
12
15
13
July
14.5
14
15
18
15
August
13.5
15
15
14
11
September
9.8
12
11
11
0
October
1.8
2
3
5
November
-2.0
-1
-4
0
2
December
-5.2
-3
0
-7
-4
Average
1.6
-6.1
4.3
3.1
3.5
3.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.3
7
0
7
9
9
February
13.3
6
7
12
12
14
March
11.3
13
19
10
7
8
April
13.5
13
17
11
15
May
9.2
9
12
6
9
June
4.2
10
1
2
2
July
1.1
2
1
2
1
August
3.4
7
3
2
0
September
5.0
1
3
2
0
October
9.1
10
3
8
November
7.7
2
12
2
0
December
9.2
4
0
10
6
Average
7.9
8.9
7.2
7.1
5.7
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
4.0
6
0
8
2
3
February
5.3
7
0
9
6
3
March
6.1
7
6
8
8
4
April
7.0
8
9
7
5
May
6.6
6
7
7
6
June
6.7
5
6
7
8
July
5.9
5
6
6
6
August
5.5
6
6
6
4
September
6.0
5
6
7
0
October
6.3
6
5
7
November
5.3
6
3
8
0
December
4.7
7
0
9
2
Average
5.8
6.5
5.5
6.4
6.7
4.7
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
242°
360°
252°
215°
234°
February
242°
360°
256°
276°
229°
March
298°
268°
302°
256°
222°
April
288°
309°
303°
288°
May
019°
276°
288°
226°
June
084°
249°
314°
233°
July
280°
277°
120°
125°
August
237°
267°
259°
013°
September
239°
242°
244°
360°
October
304°
251°
245°
November
254°
220°
247°
360°
December
252°
360°
224°
227°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.