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
74.8
74
68
73
73
61
February
83.2
76
82
81
84
90
March
87.5
89
73
97
91
89
April
87.1
84
86
77
87
96
May
93.4
94
91
95
94
June
93.0
93
98
97
96
July
95.0
98
96
92
98
August
93.4
91
94
93
95
September
91.5
87
97
94
96
October
90.6
91
99
86
92
November
89.1
96
80
92
93
December
79.6
75
58
79
85
Average
88.1
81.4
87.0
89.0
89.4
91.2
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
-6.1
-6
-7
-7
-2
-7
February
-5.7
4
-5
-4
-8
-3
March
2.6
5
-4
2
10
4
April
10.3
14
6
8
13
11
May
20.8
24
19
21
18
June
27.5
28
27
31
28
July
28.0
27
28
29
29
August
26.2
26
27
29
27
September
22.7
24
24
25
22
October
12.9
15
16
16
10
November
4.4
7
3
7
8
December
-2.1
3
-5
-4
1
Average
11.0
4.2
12.0
12.0
13.9
12.2
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
-15.5
-13
-15
-20
-10
-14
February
-15.4
-5
-16
-19
-17
-13
March
-8.9
-6
-14
-7
-3
-5
April
-1.7
2
-3
-1
0
0
May
8.3
11
9
7
7
June
15.0
16
16
15
16
July
16.1
14
17
17
17
August
14.7
15
15
16
15
September
10.5
12
11
11
9
October
2.1
4
3
6
-1
November
-6.5
-4
-6
-3
-4
December
-11.0
-6
-14
-13
-10
Average
0.3
-6.4
1.2
0.8
2.1
1.5
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
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
2021
2020
January
11.2
11
10
13
11
12
February
11.9
11
14
15
10
12
March
11.1
13
13
13
13
12
April
11.3
15
13
16
12
11
May
9.6
13
12
12
12
June
9.9
9
12
9
12
July
7.6
8
9
8
9
August
7.7
9
9
10
8
September
9.2
8
10
10
10
October
10.8
12
12
12
12
November
10.1
12
12
11
12
December
10.7
11
13
11
12
Average
10.2
12.5
10.9
12.0
10.6
11.1
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
285°
292°
284°
292°
248°
February
288°
270°
298°
267°
278°
March
349°
357°
334°
183°
304°
April
002°
344°
001°
349°
321°
May
136°
261°
222°
043°
June
111°
256°
240°
174°
July
299°
280°
180°
214°
August
332°
260°
202°
069°
September
093°
242°
235°
284°
October
324°
280°
254°
286°
November
281°
283°
276°
249°
December
285°
341°
288°
294°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.