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
January
89.4
86
95
86
February
96.0
93
99
97
March
96.4
95
96
98
April
96.9
98
96
May
96.6
97
97
June
94.5
95
94
July
98.7
100
98
97
August
97.0
100
100
94
September
96.6
98
96
October
91.9
92
92
November
96.9
99
96
96
December
92.8
94
95
90
Average
94.6
91.7
96.8
96.0
94.0
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
2021
January
-1.9
-1
1
0
February
3.9
4
4
4
March
9.6
11
8
11
April
12.3
14
11
May
20.0
24
16
June
23.2
25
21
July
32.1
32
32
32
August
30.9
34
33
29
September
24.8
26
24
October
16.4
18
15
November
4.1
4
1
8
December
0.6
2
-2
1
Average
12.2
4.7
13.1
14.5
16.6
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
January
-6.6
-7
-4
-6
February
-5.8
-2
-5
-6
March
-3.8
-2
-3
-1
April
-1.2
0
-1
May
6.0
8
4
June
9.9
10
10
July
10.5
10
11
11
August
11.5
17
12
11
September
6.7
8
6
October
2.0
3
1
November
-3.3
-4
-5
1
December
-5.8
-3
-6
-4
Average
0.8
-4.5
1.2
1.8
3.6
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
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
0
August
0.0
0
0
0
September
0.0
0
0
October
0.0
0
0
November
0.0
0
0
0
December
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
January
2.6
3
3
2
February
3.0
3
3
4
March
2.7
2
3
3
April
3.7
3
5
May
2.4
2
3
June
1.9
1
3
July
2.4
2
3
3
August
3.0
1
3
3
September
2.5
2
3
October
2.6
2
4
November
2.5
1
4
3
December
1.7
2
1
2
Average
2.6
2.5
2.1
2.9
2.7
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
January
013°
067°
172°
February
066°
328°
242°
March
335°
040°
273°
April
252°
043°
May
065°
260°
June
260°
306°
July
241°
257°
272°
August
288°
243°
258°
September
052°
248°
October
148°
300°
November
066°
064°
161°
December
070°
067°
197°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.