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
80.9
60
85
94
82
77
February
90.7
91
92
99
87
96
March
87.6
94
87
95
87
77
April
94.6
99
96
97
94
May
91.6
93
89
96
90
June
97.8
99
98
98
99
July
97.3
96
97
97
99
August
96.7
93
98
99
99
September
94.3
92
98
99
93
October
92.3
95
100
94
95
November
95.3
99
98
97
95
December
89.0
82
78
94
90
Average
91.4
81.6
92.7
95.5
94.1
92.2
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
2.1
-1
3
5
3
2
February
5.4
14
8
7
-4
7
March
12.5
15
11
14
15
13
April
18.7
21
19
19
19
May
24.2
27
24
23
22
June
31.0
31
31
32
32
July
31.3
30
32
31
31
August
30.5
32
33
32
31
September
28.2
30
30
29
26
October
18.9
20
22
21
17
November
11.9
14
11
14
15
December
6.2
8
4
10
6
Average
17.2
8.8
19.6
19.8
19.0
18.2
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
-8.3
-9
-6
-10
-6
-7
February
-8.5
-2
-7
-9
-13
-6
March
-1.7
0
-2
-2
2
2
April
4.1
5
4
5
2
May
11.9
12
13
12
11
June
18.1
17
18
18
20
July
20.0
20
20
19
21
August
18.5
19
19
20
18
September
14.6
15
14
15
12
October
5.9
8
5
8
4
November
-2.7
-1
-2
1
0
December
-6.7
-3
-6
-4
-7
Average
4.7
-4.0
6.4
5.8
6.5
5.8
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
8.7
17
10
5
8
8
February
5.6
2
4
1
10
3
March
6.5
4
8
8
9
5
April
6.5
5
6
8
6
May
5.4
1
13
4
7
June
2.7
3
3
1
1
July
2.9
3
5
1
3
August
3.2
4
3
1
1
September
4.0
1
3
3
7
October
6.1
3
3
5
2
November
4.9
9
6
1
6
December
7.5
16
7
0
6
Average
5.5
7.5
5.3
5.1
4.0
4.3
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
9.4
9
9
10
9
10
February
10.2
10
11
12
8
11
March
11.7
12
12
13
12
11
April
12.1
13
14
11
11
May
9.8
9
11
10
10
June
9.4
8
10
8
12
July
7.8
7
9
8
8
August
8.0
8
8
9
9
September
9.4
8
9
9
10
October
10.1
11
10
9
10
November
10.3
9
12
10
11
December
9.1
8
11
10
8
Average
9.8
10.3
9.4
10.6
9.4
10.0
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
325°
329°
294°
331°
315°
February
288°
312°
322°
002°
315°
March
003°
345°
352°
162°
249°
April
283°
258°
298°
318°
May
134°
133°
146°
016°
June
148°
187°
172°
175°
July
064°
184°
166°
154°
August
159°
160°
163°
171°
September
168°
159°
178°
256°
October
317°
268°
321°
329°
November
246°
280°
264°
238°
December
313°
265°
284°
322°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.