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
74.5
59
67
87
76
75
February
81.3
96
91
57
93
76
March
85.8
89
76
87
93
81
April
93.9
93
95
94
94
May
92.0
90
89
92
96
June
94.4
87
99
95
97
July
94.8
93
92
93
97
August
93.1
93
91
98
93
September
94.4
96
94
94
93
October
90.2
92
95
84
91
November
88.3
89
84
93
91
December
85.2
77
76
88
96
Average
88.7
81.5
87.3
87.9
91.4
90.6
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
3.4
2
6
2
3
6
February
7.1
11
10
6
0
5
March
12.1
16
12
14
15
13
April
17.4
19
17
18
16
May
23.6
24
25
22
21
June
28.1
28
29
28
29
July
29.7
29
31
29
31
August
28.5
28
29
30
28
September
26.4
26
25
27
25
October
19.2
19
19
20
18
November
10.9
13
12
10
15
December
7.1
9
6
11
6
Average
16.8
9.7
18.7
17.9
17.8
17.6
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
-4.2
-4
0
-7
-3
-1
February
-3.7
0
-1
-5
-7
-3
March
2.1
5
1
2
3
4
April
6.6
6
7
7
6
May
13.1
12
15
11
12
June
18.2
16
19
19
18
July
20.3
19
22
20
21
August
18.8
19
18
20
19
September
15.9
15
15
17
14
October
9.4
10
7
13
8
November
1.7
2
2
1
4
December
-1.0
2
0
1
-2
Average
7.3
0.6
8.6
7.9
8.6
8.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
13.8
20
17
9
9
13
February
10.7
5
8
17
10
20
March
11.6
7
19
15
8
11
April
9.1
11
11
9
9
May
7.7
5
10
9
7
June
4.7
6
5
6
3
July
3.8
3
7
4
3
August
3.0
5
3
2
2
September
3.6
3
3
5
1
October
8.9
9
6
11
7
November
8.0
6
15
5
6
December
9.6
10
7
9
8
Average
7.9
10.3
8.1
8.9
7.0
7.1
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
7.2
7
7
8
7
7
February
7.7
8
7
8
8
8
March
8.5
9
9
8
8
8
April
8.0
7
9
8
8
May
6.6
6
7
6
7
June
5.9
6
6
5
6
July
5.3
5
5
5
5
August
5.2
5
6
5
5
September
5.4
4
6
7
6
October
6.6
7
7
6
6
November
7.0
7
7
7
8
December
6.8
6
7
8
7
Average
6.8
7.9
6.4
6.8
6.4
6.5
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
253°
271°
291°
245°
239°
February
284°
232°
266°
329°
296°
March
244°
266°
243°
218°
273°
April
240°
228°
270°
278°
May
030°
169°
013°
276°
June
005°
274°
220°
216°
July
273°
276°
298°
288°
August
298°
292°
206°
320°
September
021°
310°
244°
240°
October
271°
246°
224°
238°
November
251°
228°
243°
242°
December
232°
175°
218°
254°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.