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
86.2
81
78
94
88
84
February
89.3
93
89
100
93
96
March
89.3
87
80
89
92
91
April
83.0
79
78
81
90
May
86.3
87
84
88
91
June
88.2
80
92
89
92
July
92.6
94
88
90
91
August
86.8
87
86
85
85
September
83.6
80
86
93
85
October
91.0
90
93
80
95
November
92.9
100
83
99
94
December
85.2
81
74
86
91
Average
87.7
87.1
85.2
86.3
88.4
90.2
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
-5.1
-4
-3
-9
-3
-3
February
-4.6
3
-2
-10
-7
-2
March
3.3
5
1
2
7
4
April
7.8
7
5
10
8
May
16.1
16
16
18
15
June
21.8
21
23
25
23
July
25.9
25
25
26
27
August
24.4
24
24
26
25
September
20.0
21
21
22
19
October
12.0
13
14
15
9
November
3.5
6
5
5
7
December
-2.3
3
-2
-1
-1
Average
8.9
1.6
11.0
10.0
12.0
10.7
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
-13.3
-10
-11
-17
-11
-11
February
-13.3
-7
-13
-10
-17
-14
March
-7.7
-5
-8
-6
-3
-4
April
-2.4
-1
-2
0
-2
May
3.4
3
3
4
4
June
8.6
8
8
11
9
July
12.6
12
10
13
14
August
12.6
12
13
13
14
September
9.1
11
8
9
7
October
3.1
4
2
6
0
November
-5.4
-4
-3
-4
-3
December
-10.5
-3
-10
-11
-10
Average
-2.9
-8.7
0.9
0.2
1.0
0.4
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
10.2
13
18
6
4
13
February
9.8
4
13
0
4
6
March
6.7
11
14
4
6
7
April
11.2
14
14
12
6
May
6.3
3
12
2
3
June
4.2
4
2
5
3
July
2.9
1
4
4
4
August
5.2
2
4
5
5
September
5.5
6
4
4
3
October
8.0
8
2
7
8
November
7.4
3
18
4
5
December
10.6
13
22
10
6
Average
7.4
9.4
7.6
7.4
5.4
5.3
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
6.2
5
6
7
6
6
February
7.4
8
7
10
7
8
March
7.6
8
8
8
8
7
April
7.9
9
9
7
8
May
7.0
8
7
7
7
June
6.3
6
8
6
7
July
5.2
5
6
6
5
August
5.8
6
6
7
6
September
5.7
6
6
7
7
October
6.7
7
7
6
8
November
6.9
7
7
7
7
December
6.0
6
5
7
6
Average
6.6
7.1
6.6
7.1
6.6
6.6
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
260°
277°
254°
260°
270°
February
296°
275°
360°
265°
265°
March
331°
040°
313°
319°
349°
April
026°
025°
006°
349°
May
046°
024°
027°
031°
June
052°
288°
006°
009°
July
320°
288°
024°
318°
August
047°
336°
253°
297°
September
067°
341°
273°
264°
October
341°
276°
032°
270°
November
252°
286°
284°
255°
December
273°
321°
264°
276°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.