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
86.0
80
85
92
91
90
February
85.7
94
90
89
80
95
March
86.6
86
91
87
89
84
April
92.5
89
96
95
95
May
88.0
99
83
95
94
June
91.0
84
90
92
94
July
90.4
87
97
87
93
August
91.2
95
94
93
91
September
87.2
90
88
88
87
October
86.9
89
89
87
82
November
92.1
97
88
96
90
December
81.4
76
76
80
87
Average
88.4
86.7
89.5
89.8
89.7
89.3
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
3.3
4
7
1
3
5
February
6.3
7
8
6
3
4
March
9.8
12
10
11
12
12
April
16.2
19
15
17
13
May
21.7
22
23
22
20
June
25.6
24
26
27
27
July
28.6
29
29
28
30
August
27.2
26
29
28
28
September
23.7
23
23
26
23
October
18.1
19
17
19
17
November
10.3
11
12
10
14
December
5.3
7
5
8
6
Average
15.5
7.4
17.1
16.8
16.9
17.7
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
-5.6
-3
-1
-9
-4
-1
February
-4.2
-4
-4
-6
-6
-1
March
-1.1
1
-1
-1
-1
1
April
3.8
4
3
3
3
May
8.3
4
8
7
8
June
12.7
11
11
14
13
July
16.8
16
16
17
18
August
16.1
16
16
17
16
September
12.2
11
11
13
11
October
6.7
7
4
9
6
November
-1.2
-2
0
-2
1
December
-3.3
0
-3
-1
-4
Average
4.7
-2.2
5.3
4.3
5.6
6.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.5
17
11
11
7
3
February
11.4
6
6
9
22
10
March
13.7
16
14
10
10
14
April
10.0
9
13
10
12
May
9.7
2
12
9
7
June
6.5
6
3
8
5
July
4.9
4
3
5
3
August
5.4
5
2
5
5
September
8.6
11
10
7
4
October
8.8
9
10
6
10
November
7.9
2
11
5
10
December
11.4
13
22
4
12
Average
9.4
13.4
7.3
8.7
7.8
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
3.3
3
3
3
4
2
February
3.3
3
3
3
3
5
March
4.4
4
4
4
4
4
April
4.3
4
5
4
5
May
2.8
3
3
3
4
June
2.2
2
2
2
2
July
1.5
1
2
1
2
August
1.6
2
2
1
2
September
1.8
2
2
2
2
October
2.2
2
2
2
2
November
3.0
3
3
3
3
December
2.6
2
3
2
3
Average
2.8
3.5
2.6
2.7
2.5
2.7
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
274°
284°
294°
301°
264°
February
291°
270°
270°
298°
266°
March
290°
269°
262°
290°
307°
April
260°
282°
288°
295°
May
292°
124°
294°
253°
June
345°
283°
218°
276°
July
240°
242°
283°
230°
August
288°
239°
289°
251°
September
003°
288°
258°
321°
October
281°
274°
302°
256°
November
290°
263°
279°
276°
December
284°
304°
272°
285°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.