Chicago/Rockford International Airport

KRFD · Illinois, United States

Climate Chicago/Rockford International Airport 2020-2024

Climate and trends: average temperature, flight conditions, precipitation, wind speed and direction.

Calculated from historical METAR data of Chicago/Rockford International Airport (KRFD) between 2020 and 2024.

VFR conditions (%)

Month Average 2024 2023 2022 2021 2020
January 47.6 37 19 76 46 43
February 73.4 82 70 77 82 82
March 72.0 75 62 71 79 54
April 78.4 76 79 90 81
May 79.0 87 76 86 78
June 86.6 79 92 88 95
July 90.0 89 88 88 94
August 88.1 88 84 92 93
September 83.7 79 82 95 76
October 76.4 77 88 68 78
November 74.3 86 72 88 83
December 61.1 42 45 71 74
Average 75.8 65.2 72.4 79.1 82.3 78.8

VFR conditions during daylight period

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 76.0 66 60 93 76 78
February 86.6 93 86 92 89 91
March 89.6 89 88 89 96 78
April 92.4 94 92 97 93
May 93.2 94 95 98 92
June 94.5 88 95 96 98
July 98.0 98 96 99 99
August 95.7 96 96 97 99
September 93.9 96 93 100 87
October 91.4 92 95 90 93
November 91.0 93 89 99 94
December 84.5 73 78 87 97
Average 90.3 83.1 88.9 92.4 94.2 91.7

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 -1.3 -2 2 -3 0 2
February 2.7 10 4 2 -4 2
March 9.2 12 7 10 12 10
April 15.2 17 13 18 15
May 22.3 24 24 22 21
June 28.2 28 29 30 29
July 29.2 29 29 29 30
August 28.0 28 28 30 29
September 25.0 25 24 28 23
October 16.8 17 18 19 16
November 8.4 10 11 9 14
December 4.2 6 3 7 5
Average 14.6 6.6 16.4 15.9 16.7 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 -8.4 -7 -4 -13 -6 -5
February -7.2 -3 -6 -8 -12 -7
March -1.5 1 -1 -1 1 1
April 3.8 3 3 6 4
May 10.7 10 13 10 10
June 16.4 15 16 19 17
July 18.6 16 19 19 20
August 17.1 17 18 18 17
September 13.9 15 13 14 12
October 6.7 7 5 10 5
November -1.3 -1 0 -1 3
December -4.5 0 -4 -2 -4
Average 4.6 -3.1 5.9 5.4 6.5 6.2

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Precipitation (%)

Month Average 2024 2023 2022 2021 2020
January 20.0 20 32 13 18 17
February 13.0 2 18 14 12 10
March 11.8 13 14 20 7 14
April 13.1 14 16 7 12
May 10.0 8 13 10 11
June 5.0 4 6 5 5
July 2.7 4 5 4 2
August 3.4 3 5 1 1
September 6.1 8 7 2 11
October 11.7 17 9 14 7
November 11.4 7 24 10 7
December 13.3 20 22 8 8
Average 9.9 11.7 11.7 11.9 7.6 8.4

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 8.5 8 7 10 8 8
February 9.4 9 9 11 9 10
March 10.0 10 9 9 11 10
April 10.2 10 11 10 10
May 8.2 6 9 9 9
June 7.5 6 8 7 7
July 6.7 5 7 7 7
August 6.6 6 6 6 7
September 7.3 6 7 8 8
October 8.7 9 8 7 9
November 9.3 9 10 10 10
December 8.3 8 8 9 8
Average 8.4 8.9 7.5 8.6 8.2 8.5

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 260° 269° 280° 343° 258°
February 241° 259° 261° 297° 307°
March 268° 295° 296° 187° 220°
April 245° 238° 256° 287°
May 003° 180° 187° 048°
June 338° 250° 227° 184°
July 253° 261° 312° 217°
August 248° 239° 206° 236°
September 146° 298° 256° 258°
October 266° 257° 328° 277°
November 236° 233° 250° 222°
December 242° 210° 244° 270°

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.