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
71.6
55
64
92
74
69
February
83.7
90
87
81
93
82
March
88.0
88
83
91
93
83
April
92.4
93
94
94
93
May
93.9
97
91
95
96
June
94.6
92
96
97
98
July
94.7
92
92
92
98
August
92.8
87
88
98
95
September
92.7
87
91
97
92
October
89.2
87
91
82
92
November
88.6
86
90
92
93
December
82.6
71
75
84
95
Average
88.2
77.3
86.2
89.9
91.7
91.1
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
1
4
-1
1
4
February
5.1
10
8
2
-2
3
March
10.3
14
10
12
14
11
April
16.0
18
15
17
15
May
22.6
23
24
21
21
June
27.6
27
29
28
28
July
28.7
29
29
28
30
August
27.5
27
28
29
28
September
25.4
25
24
27
25
October
18.3
19
18
20
17
November
9.6
12
12
9
13
December
5.5
8
4
9
5
Average
15.5
8.1
17.3
16.7
16.9
16.6
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
-6.7
-5
-2
-10
-3
-2
February
-5.8
-1
-3
-7
-9
-5
March
0.3
3
-1
1
2
2
April
4.7
5
5
5
4
May
11.4
10
12
10
11
June
16.5
15
16
18
17
July
18.4
17
19
19
19
August
17.1
17
17
19
17
September
14.0
14
13
15
13
October
7.8
8
5
12
6
November
0.5
1
1
0
3
December
-3.7
2
-2
-1
-3
Average
5.7
-1.1
7.0
6.2
7.2
6.7
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
18.8
27
27
11
11
21
February
15.3
8
12
26
16
22
March
13.4
8
18
22
6
14
April
11.7
16
19
10
8
May
9.4
7
17
9
9
June
4.9
7
5
7
2
July
5.2
5
11
4
4
August
3.5
6
5
3
3
September
5.1
6
6
6
4
October
9.7
15
7
10
6
November
10.4
8
19
8
9
December
11.7
15
15
8
8
Average
9.9
14.1
11.5
13.4
7.6
8.4
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
9.7
10
10
10
8
9
February
10.2
9
12
10
9
10
March
11.0
11
11
12
11
10
April
10.7
11
12
10
10
May
9.1
8
10
8
9
June
8.2
8
8
8
8
July
6.6
6
7
7
6
August
6.4
7
6
6
6
September
7.2
6
7
9
8
October
9.3
10
10
8
9
November
9.8
9
11
10
11
December
9.4
9
10
10
10
Average
9.0
10.1
8.8
9.3
8.5
8.6
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
254°
268°
271°
248°
241°
February
250°
248°
254°
288°
267°
March
247°
261°
251°
227°
260°
April
248°
237°
256°
280°
May
057°
177°
255°
273°
June
019°
267°
233°
220°
July
257°
260°
267°
251°
August
263°
253°
206°
267°
September
133°
272°
236°
239°
October
261°
238°
237°
236°
November
249°
239°
242°
238°
December
243°
190°
232°
244°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.