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
January
75.4
63
73
90
February
87.5
91
88
83
March
89.7
89
87
93
April
94.9
96
95
May
94.3
97
92
June
73.3
86
62
July
46.3
93
0
August
45.6
93
0
September
43.5
89
0
October
53.8
88
18
November
92.5
94
91
December
79.5
77
84
Average
75.6
82.0
88.9
56.0
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
January
0.9
0
4
-1
February
4.4
3
7
3
March
9.1
7
9
12
April
15.8
18
14
May
22.6
22
24
June
22.2
26
19
July
14.3
29
0
August
13.4
27
0
September
12.4
25
0
October
10.1
18
2
November
11.2
11
11
December
6.2
8
4
Average
9.2
3.5
16.8
7.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
January
-6.6
-5
-2
-10
February
-3.2
0
-2
-7
March
0.2
1
0
0
April
4.8
5
5
May
10.8
9
13
June
12.1
14
11
July
8.8
18
0
August
7.4
15
0
September
6.6
13
0
October
4.1
8
1
November
1.3
1
2
December
0.3
2
-2
Average
2.1
-2.5
6.6
1.1
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
January
0.0
0
0
0
February
0.0
0
0
0
March
0.0
0
0
0
April
0.0
0
0
May
0.0
0
0
June
0.0
0
0
July
0.0
0
0
August
0.0
0
0
September
0.0
0
0
October
0.0
0
0
November
0.0
0
0
December
0.0
0
0
Average
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
January
7.8
8
7
9
February
8.8
8
10
9
March
9.4
10
9
10
April
9.0
8
10
May
7.5
7
8
June
5.6
7
5
July
2.7
5
0
August
2.9
6
0
September
2.3
5
0
October
4.1
7
1
November
8.2
8
9
December
7.2
7
8
Average
7.0
8.6
7.0
5.3
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
January
233°
220°
215°
February
242°
217°
213°
March
241°
205°
224°
April
203°
213°
May
317°
176°
June
335°
251°
July
254°
360°
August
264°
360°
September
145°
360°
October
265°
109°
November
244°
200°
December
242°
170°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.