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
91.8
90
87
92
94
93
February
90.4
90
83
90
92
85
March
91.0
81
92
87
94
94
April
95.0
97
100
97
94
May
95.4
91
100
91
99
June
94.8
95
87
93
99
July
95.2
98
80
99
98
August
94.9
96
78
97
100
September
95.7
96
97
98
92
October
91.3
95
85
100
91
November
91.4
81
86
99
96
December
95.7
88
96
96
98
Average
92.9
86.5
91.6
89.6
95.8
95.1
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
6.2
5
5
6
6
9
February
8.4
9
7
7
7
8
March
12.7
11
10
12
12
13
April
17.9
17
19
17
18
May
22.6
22
25
22
24
June
27.8
26
27
28
29
July
29.3
32
29
27
30
August
27.9
29
25
27
30
September
25.1
26
26
25
24
October
17.5
20
15
18
19
November
11.9
12
8
14
13
December
7.2
6
6
9
6
Average
17.0
8.4
17.6
17.3
17.7
18.5
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
-6
-6
-6
-6
-3
February
-5.3
-3
-5
-8
-6
-5
March
-2.7
-2
-2
-3
-2
0
April
1.8
0
3
1
2
May
6.8
7
7
7
8
June
11.6
10
11
13
12
July
14.2
16
14
14
14
August
13.3
14
11
13
15
September
10.3
11
9
11
9
October
3.7
4
4
4
3
November
-2.7
-1
-4
-1
0
December
-5.6
-4
-4
-3
-6
Average
3.0
-4.5
3.7
2.9
3.7
3.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
5.9
13
11
2
1
6
February
8.3
7
21
9
6
10
March
6.9
11
11
12
5
4
April
3.3
4
0
1
3
May
2.9
7
0
4
1
June
4.3
2
13
5
3
July
3.8
1
5
3
4
August
3.5
3
12
3
1
September
3.0
5
1
2
1
October
5.1
3
12
3
5
November
4.3
10
7
0
0
December
4.0
11
1
3
2
Average
5.1
10.4
7.3
6.4
2.8
3.2
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
15.7
14
16
14
16
16
February
17.0
16
16
14
18
17
March
15.7
16
17
13
16
17
April
15.7
15
18
15
15
May
13.5
12
16
13
13
June
11.6
12
11
11
13
July
8.9
10
8
9
9
August
9.4
11
8
9
9
September
10.5
11
9
10
11
October
13.6
12
13
14
15
November
14.5
13
15
13
16
December
16.2
14
17
19
16
Average
13.6
15.2
13.1
12.8
13.4
13.6
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
286°
277°
297°
292°
290°
February
281°
274°
282°
287°
288°
March
272°
267°
274°
261°
263°
April
272°
269°
262°
272°
May
242°
258°
233°
259°
June
260°
254°
288°
252°
July
253°
253°
244°
270°
August
248°
065°
269°
277°
September
262°
250°
265°
313°
October
264°
286°
273°
284°
November
290°
276°
294°
277°
December
296°
277°
279°
295°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.