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
90.6
92
82
85
95
100
February
87.0
85
57
96
89
89
March
89.2
87
71
85
92
99
April
96.5
99
93
99
98
98
May
93.9
93
97
95
98
June
98.4
98
94
99
100
July
98.5
95
98
100
100
August
98.6
99
97
98
100
September
95.7
95
96
100
98
October
94.2
97
97
99
93
November
93.3
95
81
100
97
December
95.3
93
100
100
96
Average
94.0
90.5
89.5
93.6
97.0
97.4
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
8.4
5
6
11
8
10
February
10.7
12
10
9
8
9
March
15.5
14
14
15
14
18
April
19.9
21
19
21
19
19
May
24.3
23
26
23
27
June
30.3
28
30
30
32
July
32.3
34
32
32
32
August
30.4
32
27
31
33
September
28.2
28
29
30
27
October
20.2
21
20
22
23
November
15.0
16
12
18
17
December
10.5
10
11
15
9
Average
19.6
12.9
19.9
20.5
20.7
21.2
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
-7.8
-7
-7
-7
-6
-5
February
-6.7
-2
-7
-8
-8
-6
March
-2.8
-1
-3
-2
-1
0
April
2.3
3
1
2
1
2
May
7.7
8
7
9
9
June
13.3
12
13
14
14
July
16.3
16
17
16
16
August
14.9
16
12
16
16
September
12.0
12
12
12
10
October
3.5
4
4
5
3
November
-1.0
-1
-4
0
1
December
-6.8
-4
-6
-2
-6
Average
3.5
-2.0
3.8
3.7
4.6
4.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
6.2
6
12
8
5
0
February
5.0
14
5
6
7
3
March
8.0
14
8
18
10
1
April
3.9
1
7
2
4
1
May
4.4
6
6
8
1
June
3.6
3
10
6
2
July
1.9
1
3
0
2
August
1.1
0
2
2
1
September
3.3
6
3
1
2
October
4.6
4
6
3
4
November
4.2
3
14
0
2
December
3.8
8
0
0
2
Average
4.5
8.6
5.1
6.7
3.8
1.6
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
7.6
7
8
7
7
9
February
9.4
10
10
8
8
8
March
10.2
9
11
10
11
11
April
10.0
10
10
11
10
8
May
9.3
8
11
9
9
June
8.7
9
9
7
11
July
7.2
6
7
6
8
August
7.0
8
6
6
8
September
7.7
8
7
7
8
October
7.8
8
7
8
7
November
7.7
7
8
7
9
December
8.0
7
10
11
7
Average
8.5
9.0
8.3
8.4
8.1
8.6
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
321°
288°
351°
288°
280°
February
277°
275°
292°
278°
010°
March
268°
262°
339°
284°
240°
April
268°
267°
256°
284°
302°
May
246°
256°
209°
221°
June
227°
218°
254°
219°
July
181°
256°
262°
248°
August
186°
240°
224°
267°
September
259°
228°
216°
303°
October
226°
258°
228°
289°
November
317°
228°
333°
237°
December
315°
269°
258°
327°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.