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
93.7
96
85
100
97
93
February
95.7
95
94
96
100
96
March
96.1
97
92
97
0
99
April
98.4
98
99
96
100
May
99.6
99
100
100
100
June
99.7
100
100
99
99
July
99.8
100
100
100
100
August
99.6
100
100
100
100
September
99.8
100
100
99
100
October
99.0
99
99
98
99
November
97.8
97
99
100
98
December
94.7
99
91
95
91
Average
97.8
96.0
97.1
98.6
98.4
97.9
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
0.7
4
-1
-1
-1
2
February
3.5
7
0
0
5
6
March
8.8
9
4
10
0
12
April
16.5
15
17
17
17
May
22.9
22
22
24
25
June
28.1
25
30
32
28
July
33.2
33
34
33
33
August
31.6
30
31
30
35
September
27.3
26
29
27
28
October
18.1
19
19
16
21
November
10.3
11
5
13
11
December
2.9
6
0
4
1
Average
16.4
6.8
16.0
16.8
19.1
18.3
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
-11.6
-7
-10
-14
-13
-9
February
-10.3
-5
-14
-14
-6
-7
March
-4.5
-3
-5
-4
0
-2
April
-3.9
-2
-2
-2
-1
May
2.5
4
1
2
3
June
6.9
6
7
9
6
July
10.1
9
11
12
9
August
8.9
8
11
9
9
September
4.5
4
7
4
3
October
-3.6
-2
0
0
-4
November
-7.7
-5
-8
-5
-6
December
-10.1
-8
-11
-9
-15
Average
-2.9
-5.2
-2.8
-1.0
0.7
-2.7
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
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
2.2
1
3
2
2
3
February
3.2
4
3
2
5
4
March
5.0
6
5
4
0
6
April
6.0
6
6
6
6
May
5.8
5
6
6
6
June
5.5
5
6
5
6
July
4.4
4
5
4
5
August
4.4
4
4
5
5
September
4.3
4
4
4
4
October
3.6
3
3
4
4
November
2.7
3
3
2
3
December
2.5
2
3
4
3
Average
4.1
3.5
4.0
4.0
4.3
4.5
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
237°
170°
146°
071°
197°
February
225°
207°
360°
182°
226°
March
211°
238°
257°
360°
210°
April
231°
226°
242°
225°
May
189°
229°
222°
217°
June
202°
201°
225°
224°
July
211°
216°
187°
209°
August
213°
168°
221°
212°
September
211°
209°
212°
231°
October
212°
231°
199°
231°
November
201°
232°
239°
199°
December
241°
202°
205°
313°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.