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
81.9
76
60
93
0
85
February
90.0
98
89
93
0
94
March
90.0
92
85
87
88
April
90.4
91
87
91
93
May
95.1
96
95
90
98
June
96.7
95
99
97
97
July
97.0
98
97
96
97
August
95.5
97
93
98
100
September
91.9
93
96
95
89
October
90.8
93
99
92
83
November
91.2
99
84
98
95
December
84.7
77
84
87
Average
91.7
89.5
89.8
93.2
94.3
92.1
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
-4.2
-3
-3
-6
-13
-3
February
-2.9
5
-1
-4
-25
-2
March
4.1
7
2
3
6
April
11.5
14
11
9
13
May
20.3
22
21
21
16
June
26.4
27
27
29
26
July
24.1
27
28
28
28
August
23.0
27
26
27
25
September
22.1
24
23
23
19
October
13.0
14
15
16
9
November
4.6
7
6
6
9
December
-1.6
4
-2
0
Average
11.7
5.7
13.5
12.4
18.3
11.6
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
-12.9
-8
-9
-17
-13
-10
February
-11.1
-5
-12
-16
-25
-10
March
-5.7
-3
-6
-5
-1
April
1.2
3
2
1
1
May
8.8
10
9
10
5
June
15.0
15
15
16
16
July
14.1
15
17
16
17
August
13.6
16
15
16
15
September
11.9
14
11
11
8
October
4.2
5
4
7
-1
November
-3.3
-2
-2
-2
-1
December
-8.4
-3
-9
-9
Average
2.4
-4.7
3.7
2.2
7.8
2.0
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
7.8
2
15
6
0
12
February
9.6
4
12
9
0
5
March
8.2
10
14
8
9
April
11.5
11
14
14
9
May
6.3
3
7
9
8
June
3.7
1
3
3
5
July
2.1
1
3
1
3
August
3.5
2
3
3
2
September
3.9
3
2
2
7
October
6.6
6
4
4
7
November
7.1
1
14
4
5
December
9.9
5
12
12
Average
6.6
7.1
6.0
6.4
4.2
6.7
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
6.1
6
5
7
0
4
February
7.0
8
7
8
0
6
March
7.3
8
7
7
7
April
8.4
10
10
10
7
May
7.0
7
8
7
8
June
6.5
6
8
6
6
July
5.4
6
7
5
5
August
5.9
6
6
7
7
September
6.3
6
7
6
6
October
7.1
8
7
6
7
November
7.8
8
8
9
8
December
6.4
6
7
8
Average
6.9
8.2
6.7
7.5
6.5
6.2
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
271°
301°
244°
360°
274°
February
252°
242°
284°
360°
257°
March
321°
001°
324°
261°
April
312°
277°
238°
308°
May
134°
183°
170°
359°
June
104°
231°
241°
175°
July
265°
253°
199°
208°
August
207°
202°
203°
166°
September
157°
201°
218°
231°
October
295°
239°
194°
264°
November
237°
245°
264°
213°
December
209°
161°
246°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.