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
88.8
80
82
94
95
92
February
85.0
71
91
88
93
95
March
85.1
74
70
92
95
88
April
93.4
89
91
90
95
96
May
96.0
94
90
100
94
96
June
97.4
98
98
93
99
97
July
95.4
95
90
93
92
96
August
93.8
96
94
99
93
100
September
93.3
88
99
95
99
October
95.6
92
97
98
97
November
89.7
96
81
99
88
December
89.6
95
80
93
90
Average
92.2
87.8
89.7
92.8
95.0
94.8
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
-2.7
-5
0
0
2
-4
February
-4.9
1
1
1
-7
1
March
4.8
3
0
8
12
4
April
13.2
15
13
11
15
11
May
20.7
19
25
20
18
20
June
25.3
23
27
24
29
24
July
30.2
31
30
30
33
28
August
29.1
29
30
32
27
30
September
23.0
25
27
25
23
October
13.5
13
18
17
10
November
4.4
8
-1
10
6
December
-1.7
7
-8
-6
2
Average
13.6
14.4
15.0
14.1
14.6
12.9
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
-11.1
-15
-8
-11
-7
-12
February
-14.5
-9
-9
-11
-18
-8
March
-7.0
-8
-10
-5
-3
-7
April
-1.8
2
0
-2
-1
-1
May
6.4
6
9
6
5
6
June
10.9
10
12
11
13
11
July
13.6
15
14
14
16
12
August
12.5
13
14
14
12
13
September
7.7
9
10
8
8
October
0.5
2
4
2
-1
November
-6.2
-3
-10
-3
-5
December
-10.1
-4
-19
-16
-6
Average
0.6
1.6
2.2
0.7
0.8
0.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
16.6
28
18
22
8
16
February
27.9
27
26
27
22
12
March
15.9
26
31
13
4
13
April
9.4
11
18
15
7
6
May
8.4
18
3
5
13
7
June
8.3
9
6
20
4
9
July
2.7
5
6
2
1
4
August
2.8
4
4
0
6
1
September
5.4
3
4
3
3
October
8.1
13
7
3
12
November
17.0
7
30
1
18
December
17.2
4
43
22
11
Average
10.9
15.2
11.1
13.8
7.4
8.7
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
8.8
7
8
10
10
9
February
8.9
8
10
10
9
10
March
9.2
8
8
10
12
11
April
10.2
11
10
11
11
11
May
9.1
10
7
10
9
10
June
9.4
9
9
10
10
9
July
8.0
7
8
7
7
9
August
7.8
8
8
8
8
8
September
8.5
8
8
11
10
October
9.9
9
10
10
9
November
9.9
10
11
12
11
December
9.0
9
9
9
9
Average
9.0
8.6
8.5
9.5
9.7
9.5
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
244°
252°
252°
239°
245°
February
249°
250°
264°
256°
236°
March
273°
239°
269°
235°
248°
April
268°
227°
269°
271°
279°
May
277°
175°
259°
240°
236°
June
258°
224°
260°
252°
256°
July
235°
257°
251°
240°
237°
August
227°
254°
255°
264°
252°
September
230°
253°
236°
256°
October
235°
247°
237°
245°
November
228°
265°
234°
238°
December
223°
264°
242°
237°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.