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
76.1
69
60
94
70
81
February
86.4
89
87
92
88
95
March
87.4
94
82
84
95
80
April
87.3
88
87
88
94
90
May
90.3
94
92
93
88
June
93.8
89
90
92
98
July
95.7
100
91
93
97
August
93.6
95
88
95
98
September
91.7
92
89
98
95
October
89.6
84
96
85
92
November
88.7
92
88
94
89
December
82.0
78
82
82
95
Average
88.7
85.6
87.3
89.7
90.5
91.7
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
-3.5
-1
-1
-6
-2
0
February
-1.8
7
1
-2
-6
-1
March
5.1
10
3
4
9
5
April
11.9
15
14
9
14
11
May
19.5
21
20
19
18
June
25.4
27
25
27
26
July
27.2
29
27
26
28
August
25.5
27
25
26
27
September
22.0
24
21
23
20
October
14.1
15
15
17
11
November
6.0
8
8
6
10
December
0.8
5
0
1
1
Average
12.2
7.5
14.4
12.7
13.4
12.9
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
-9.3
-6
-5
-14
-7
-7
February
-10.7
-3
-8
-11
-15
-10
March
-4.9
0
-4
-4
-1
-1
April
2.2
5
3
2
4
1
May
8.8
8
10
9
8
June
14.8
15
13
16
15
July
17.1
17
16
16
18
August
16.3
17
16
17
17
September
12.6
15
11
12
11
October
5.6
7
4
9
3
November
-2.5
0
0
-2
1
December
-6.6
0
-5
-5
-6
Average
3.4
-1.0
5.3
3.4
4.5
4.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
12.2
13
15
11
7
10
February
9.6
3
15
13
9
8
March
8.4
6
12
13
5
12
April
9.3
14
9
16
4
6
May
6.6
6
7
5
10
June
5.5
6
7
5
6
July
2.8
3
4
4
3
August
3.2
3
2
6
4
September
4.4
4
7
1
6
October
8.0
11
5
5
10
November
9.2
7
16
8
8
December
9.7
7
20
8
5
Average
7.3
9.1
7.6
9.2
5.3
6.9
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
8.5
9
7
10
7
8
February
9.3
9
10
10
9
9
March
9.5
10
8
10
11
9
April
10.1
11
11
12
9
10
May
8.6
7
9
9
10
June
7.9
7
8
8
7
July
6.8
6
7
7
7
August
6.9
7
7
7
7
September
7.7
7
8
8
9
October
9.0
9
8
8
10
November
9.4
9
10
10
11
December
8.6
8
8
10
9
Average
8.6
9.7
8.0
8.8
8.4
8.7
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
286°
283°
264°
305°
272°
February
258°
263°
272°
271°
273°
March
297°
327°
309°
223°
244°
April
292°
242°
224°
274°
313°
May
058°
162°
228°
001°
June
019°
252°
241°
198°
July
273°
269°
311°
267°
August
324°
254°
227°
238°
September
157°
283°
267°
248°
October
275°
242°
003°
270°
November
253°
241°
252°
241°
December
281°
203°
253°
270°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.