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
93.2
94
92
93
95
February
92.6
89
98
97
83
March
94.2
97
88
96
97
100
April
95.8
91
97
98
99
May
98.2
99
99
96
100
June
97.8
98
98
100
97
July
99.3
99
100
99
99
August
98.8
100
98
99
September
93.1
93
97
89
October
96.6
97
99
94
November
95.5
100
90
100
95
December
96.6
100
95
94
98
Average
95.7
93.7
95.7
96.1
96.2
96.7
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
1.4
0
1
2
3
February
1.4
3
2
2
-2
March
6.6
8
2
9
8
5
April
10.4
10
8
12
12
May
16.7
20
15
15
17
June
20.6
20
20
24
20
July
27.8
28
29
30
25
August
27.0
29
25
27
September
24.2
24
25
24
October
13.8
15
15
12
November
5.2
7
-1
9
7
December
2.7
6
-1
2
3
Average
11.3
3.8
10.5
12.6
13.2
16.2
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
-8.0
-10
-9
-8
-5
February
-9.8
-5
-8
-8
-11
March
-5.3
-4
-8
-3
-4
0
April
-3.8
-2
-4
-2
-1
May
3.6
7
2
2
3
June
7.5
8
7
9
7
July
11.0
10
11
14
9
August
11.2
13
11
10
September
7.6
9
7
7
October
1.7
3
2
0
November
-6.6
-5
-11
-2
-4
December
-8.9
-5
-10
-8
-6
Average
-1.2
-7.7
-2.7
0.2
0.6
2.8
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
February
0.0
0
0
0
0
March
0.0
0
0
0
0
0
April
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
September
0.0
0
0
0
October
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
5.6
4
4
7
8
February
6.2
2
7
8
7
March
5.6
2
4
8
7
10
April
7.7
6
9
9
8
May
6.3
4
8
6
7
June
5.1
2
8
7
6
July
5.1
4
6
5
6
August
6.1
6
6
6
September
6.8
6
8
7
October
7.0
6
8
8
November
6.1
2
5
9
9
December
6.6
6
4
9
7
Average
5.6
2.6
4.3
6.8
7.4
6.8
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
189°
185°
201°
202°
February
184°
194°
238°
221°
March
205°
174°
245°
205°
162°
April
207°
233°
290°
240°
May
160°
263°
304°
253°
June
312°
223°
003°
239°
July
191°
262°
337°
287°
August
245°
273°
252°
September
209°
213°
228°
October
246°
198°
238°
November
212°
198°
204°
203°
December
182°
178°
213°
210°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.