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
87.3
79
92
92
89
February
75.7
95
88
85
74
84
March
85.2
86
94
85
88
84
April
92.4
93
88
95
96
93
May
89.2
98
89
94
95
June
94.1
88
95
96
97
July
96.0
97
98
94
95
August
95.2
96
97
96
96
September
91.6
87
96
96
94
October
88.5
95
89
89
82
November
95.5
98
94
99
94
December
83.1
77
80
82
89
Average
89.8
88.6
91.8
92.0
91.9
91.6
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
3.8
4
2
4
6
February
6.6
8
9
7
3
7
March
10.5
12
11
12
12
13
April
16.1
17
19
9
17
14
May
22.3
22
23
22
20
June
23.8
25
26
27
28
July
29.5
29
30
29
31
August
28.2
27
30
29
28
September
22.5
24
24
25
24
October
18.4
19
17
20
18
November
11.2
11
13
11
15
December
6.3
8
6
9
6
Average
16.0
10.4
18.8
17.0
17.3
17.4
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
-3.1
-2
-6
-2
-1
February
-2.7
-1
-1
-3
-3
0
March
1.4
3
1
2
2
3
April
6.0
7
8
2
6
5
May
11.0
9
13
10
10
June
13.2
15
16
17
16
July
18.4
19
20
19
21
August
18.0
18
19
20
19
September
13.2
15
14
15
13
October
9.1
9
7
12
9
November
2.1
1
4
1
4
December
-1.6
2
0
1
-1
Average
6.8
1.9
8.7
7.5
8.2
8.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.8
16
11
6
7
February
11.2
7
8
11
22
14
March
10.7
14
10
9
9
10
April
9.1
11
7
8
6
13
May
9.1
2
11
7
8
June
5.7
7
4
7
2
July
4.7
3
4
4
4
August
4.4
3
1
5
5
September
7.1
9
9
6
3
October
9.1
7
12
5
13
November
6.4
2
8
4
9
December
11.4
13
22
3
9
Average
8.4
11.9
6.0
8.2
6.9
7.8
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
6.3
6
6
7
6
February
5.2
5
6
7
6
6
March
7.2
7
8
7
7
6
April
7.2
7
7
8
7
9
May
5.7
5
6
6
7
June
5.4
6
5
5
5
July
4.5
4
6
4
5
August
4.7
5
5
5
5
September
4.9
5
5
6
5
October
5.5
5
6
6
5
November
5.9
5
7
6
6
December
5.4
5
6
5
7
Average
5.7
6.5
5.5
6.1
5.7
5.9
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
282°
292°
305°
286°
February
280°
260°
263°
311°
268°
March
291°
288°
266°
281°
309°
April
261°
249°
280°
284°
291°
May
274°
066°
298°
244°
June
347°
259°
220°
252°
July
234°
233°
259°
239°
August
263°
234°
219°
243°
September
012°
287°
250°
237°
October
271°
301°
266°
264°
November
281°
260°
268°
258°
December
272°
295°
260°
265°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.