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
85
95
70
90
100
February
91.4
96
97
81
82
March
87.7
84
94
84
89
April
87.1
93
94
68
May
95.6
98
88
98
100
June
92.0
86
98
94
96
July
97.4
97
98
99
97
August
97.3
97
97
98
98
September
94.3
93
94
97
94
October
91.4
97
84
93
86
November
95.7
96
94
99
95
December
84.5
80
78
87
95
Average
92.2
88.4
93.5
89.3
91.5
94.8
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
7.0
8
11
5
6
-4
February
10.2
11
13
11
6
March
14.7
15
14
15
14
April
19.8
23
18
19
May
23.4
23
24
23
27
June
28.0
28
27
29
29
July
30.3
32
27
31
32
August
29.4
30
29
30
29
September
25.6
26
26
26
24
October
20.3
22
17
22
20
November
14.0
14
15
12
17
December
10.1
11
9
12
8
Average
16.8
11.1
20.5
18.6
19.4
22.6
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
-2.7
-1
2
-4
-2
-4
February
-1.7
0
2
-2
-1
March
3.0
4
2
3
3
April
7.5
9
7
7
May
11.6
11
13
11
21
June
13.4
16
8
18
12
July
14.3
21
0
20
16
August
18.4
20
19
21
14
September
15.7
16
17
16
14
October
10.1
10
8
13
9
November
3.0
2
6
1
5
December
1.1
2
1
2
0
Average
6.2
1.2
9.3
6.1
9.2
9.9
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
9.2
16
12
0
0
0
February
4.9
7
8
0
0
March
6.1
13
8
0
0
April
4.1
8
0
0
May
2.3
5
0
0
0
June
2.4
6
0
0
0
July
1.1
3
0
0
0
August
1.3
2
2
0
0
September
4.0
7
6
0
0
October
4.2
3
17
0
0
November
3.6
7
6
0
0
December
5.4
9
11
0
0
Average
3.4
12.0
6.1
2.5
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
5.4
6
6
5
5
6
February
5.6
6
6
5
5
March
6.4
7
7
6
5
April
5.4
6
5
5
May
4.2
5
4
4
5
June
4.2
5
4
3
4
July
3.3
4
3
3
3
August
3.8
5
4
3
3
September
4.0
5
5
4
3
October
4.4
5
6
4
3
November
4.7
5
6
4
4
December
4.2
4
5
3
5
Average
4.6
6.1
5.1
4.7
4.0
3.4
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
301°
279°
276°
315°
329°
February
298°
267°
283°
314°
March
308°
295°
254°
300°
April
248°
292°
289°
May
006°
041°
314°
281°
June
306°
282°
204°
281°
July
224°
213°
269°
265°
August
278°
253°
075°
238°
September
353°
360°
277°
355°
October
294°
349°
305°
301°
November
293°
292°
300°
269°
December
289°
305°
287°
288°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.