Average temperature in January is -1.8 °C
Average daytime temperature is 2 °C
Average night temperature is -4.7 °C
Absolute maximum temperature: 9.1 °C
Absolute minimum temperature: -25.5 °C
Number of sunny days: 11
Number of rainy days: 10
Number of snow days: 10
Precipitation sum: 62 mm
* Weather data for Rockford United States is based on climate observations for 2023 year
| January (°C) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperature | 8 | 4.3 | 5.5 | 5.1 | 1.3 | 0.3 | 1.2 | 0.5 | 5.8 | 6.9 | 8.8 | 6.9 | 1 | 0.8 | 6.3 | 8.4 | 9.1 | 4 | 4.1 | 1.1 | 0.6 | 0.6 | -1.3 | 3.3 | 0.9 | -0.2 | 2.4 | -3.3 | -6.2 | -10.5 | -14 |
| Apparent max temperature | 5.8 | 1.1 | 3.7 | 2.7 | -2.6 | -3.6 | -1.9 | -3.3 | 1.5 | 4 | 6.2 | 4.6 | -3.6 | -3.7 | 0.1 | 4.9 | 5.2 | -0.3 | 1 | -3.3 | -3.6 | -3.1 | -6.9 | -0.4 | -3.5 | -4.2 | -3.2 | -8.8 | -11.1 | -15.1 | -19.4 |
| Mean temperature | 2.3 | 1.5 | 3.1 | 2.1 | -0.4 | -1.4 | -4.4 | -3.9 | -2.2 | 2.2 | 2.7 | 2.3 | -0.7 | -3.7 | -0.6 | 4.6 | 4.5 | 1.6 | 1.9 | -0.1 | -2.8 | -1.9 | -4 | -1.6 | -1.1 | -1.7 | -6 | -7.5 | -7.9 | -13.2 | -19.2 |
| Apparent mean temperature | -5 | -4.1 | -3.3 | -4.3 | -5.6 | -8.1 | -12.2 | -11.1 | -10.3 | -5.8 | -5 | -5.7 | -8 | -10.3 | -9.2 | -2.6 | -2.1 | -4.7 | -6.3 | -6.8 | -9.5 | -6.7 | -10.8 | -10.5 | -6.2 | -8.1 | -18.1 | -15.3 | -16.1 | -21.5 | -30.7 |
| Minimum temperature | -1.4 | -0.6 | 0.9 | 0.1 | -1.4 | -4 | -8.2 | -6.9 | -5.8 | -2.3 | -1.4 | -1.2 | -3.1 | -6.7 | -3.8 | 3 | 2.2 | -0.7 | 0.6 | -1.6 | -5.6 | -2.9 | -5.8 | -6.4 | -2.8 | -3.1 | -12.8 | -10.9 | -10.2 | -16 | -25.5 |
| Apparent min temperature | -1 | -1.6 | -0.6 | -1.6 | -4.7 | -5.6 | -8.3 | -7.6 | -6.4 | -1.4 | -0.3 | -2 | -6 | -7.8 | -6.2 | -0.3 | 0 | -2.4 | -2.1 | -5.3 | -6.9 | -5.4 | -8.9 | -5.9 | -5 | -6.1 | -11.8 | -12.4 | -13.5 | -18.5 | -24.4 |
| January | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight duration (h) | 9.1 | 9.2 | 9.2 | 9.2 | 9.2 | 9.2 | 9.2 | 9.3 | 9.3 | 9.3 | 9.3 | 9.4 | 9.4 | 9.4 | 9.4 | 9.5 | 9.5 | 9.5 | 9.5 | 9.6 | 9.6 | 9.6 | 9.7 | 9.7 | 9.7 | 9.8 | 9.8 | 9.8 | 9.9 | 9.9 | 10 |
| Sunshine duration (h) | 7 | 0.8 | 0 | 0.5 | 0 | 7.5 | 8 | 7.5 | 8 | 8 | 3.1 | 0 | 5.6 | 8.2 | 7.1 | 0 | 0 | 0 | 0.5 | 1 | 4.1 | 0 | 4.7 | 7.2 | 0 | 0 | 1.4 | 0 | 5.5 | 8.7 | 8.5 |
| Precipitation (mm) | 2.4 | 0 | 10.8 | 0.5 | 1.9 | 0.3 | 0 | 0 | 0 | 0 | 0 | 0.1 | 0.7 | 0 | 0 | 10.8 | 0.4 | 0.1 | 9.8 | 0.9 | 0.1 | 2.5 | 0 | 0 | 5.8 | 2.6 | 0.4 | 5.4 | 6.5 | 0.3 | 0 |
| Precipitation hours | 6 | 0 | 13 | 5 | 13 | 3 | 0 | 0 | 0 | 0 | 0 | 1 | 6 | 0 | 0 | 14 | 4 | 1 | 15 | 5 | 1 | 18 | 0 | 0 | 14 | 18 | 4 | 9 | 10 | 3 | 0 |
| Wind speed (m/s) | 13.2 | 11.6 | 19.4 | 15.9 | 14.8 | 14.3 | 8.6 | 9.2 | 12.6 | 17.7 | 12.6 | 25.3 | 20.2 | 11.3 | 23.7 | 24.5 | 24.4 | 20 | 32.7 | 20.1 | 11.9 | 10.8 | 20.8 | 18.6 | 16.5 | 16.4 | 28.5 | 18.8 | 18.7 | 15.3 | 11.9 |
In January 2023, the highest daytime temperature in Rockford was 9.1°C.
While the minimum temperature at night dropped to -25.5°C.
The average nighttime and daytime temperatures during January in Rockford are -4.7°C and 2°C respectively.
The precipitation sum in January is about 62 mm.