| Point Forecast: Crystal Lake IL 42.23N 88.36W |
Last Update: 3:31 pm CDT Jul 19, 2026 |
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| Date | 07/19 | 07/20 | ||||||||||||||||||||||
| Hour (CDT) | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| Temperature (°C) | 27 | 26 | 25 | 23 | 21 | 20 | 19 | 18 | 18 | 17 | 17 | 17 | 17 | 17 | 18 | 21 | 23 | 24 | 26 | 27 | 28 | 28 | 29 | 29 |
| Dewpoint (°C) | 15 | 14 | 14 | 13 | 13 | 12 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 15 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 19 |
| Heat Index (°C) | 27 | 27 | 25 | 25 | 26 | 28 | 28 | 29 | 30 | 30 | ||||||||||||||
| Surface Wind (mph) | 6 | 6 | 5 | 5 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 10 | 11 | 13 | 14 |
| Wind Dir | E | E | E | E | E | ESE | ESE | SSE | S | S | S | S | S | SSW | SSW | SSW | SSW | SSW | SSW | SW | SW | SW | SSW | SSW |
| Gust | 22 | 25 | ||||||||||||||||||||||
| Sky Cover (%) | 38 | 35 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 40 | 47 | 42 | 49 | 58 | 57 | 79 | 62 |
| Precipitation Potential (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 2 | 2 | 2 | 15 | 15 | 15 | 22 |
| Relative Humidity (%) | 48 | 48 | 50 | 54 | 59 | 63 | 68 | 72 | 76 | 80 | 82 | 86 | 88 | 90 | 84 | 76 | 69 | 63 | 58 | 55 | 54 | 54 | 54 | 55 |
| Rain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | SChc | SChc | SChc | SChc |
| Thunder | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Date | 07/21 | |||||||||||||||||||||||
| Hour (CDT) | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| Temperature (°C) | 29 | 29 | 28 | 27 | 26 | 24 | 24 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 23 | 24 | 26 | 27 | 27 | 28 | 28 | 28 | 28 |
| Dewpoint (°C) | 19 | 20 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 19 | 19 | 19 | 19 | 19 | 19 |
| Heat Index (°C) | 31 | 31 | 30 | 29 | 26 | 24 | 24 | 24 | 26 | 28 | 28 | 29 | 29 | 29 | 29 | |||||||||
| Surface Wind (mph) | 15 | 15 | 14 | 14 | 13 | 11 | 11 | 11 | 11 | 11 | 10 | 10 | 10 | 10 | 10 | 11 | 14 | 15 | 16 | 16 | 16 | 17 | 17 | 17 |
| Wind Dir | SSW | WSW | WSW | SW | SW | SW | SW | WSW | WSW | WSW | W | WSW | WSW | W | W | W | WNW | WNW | WNW | WNW | WNW | NW | NW | NW |
| Gust | 25 | 25 | 24 | 23 | 22 | 21 | 21 | 21 | 20 | 20 | 18 | 24 | 25 | 25 | 26 | 28 | 28 | |||||||
| Sky Cover (%) | 61 | 49 | 43 | 42 | 38 | 63 | 59 | 31 | 57 | 70 | 50 | 42 | 29 | 22 | 7 | 45 | 30 | 14 | 17 | 21 | 24 | 26 | 27 | 29 |
| Precipitation Potential (%) | 22 | 22 | 43 | 43 | 43 | 63 | 63 | 63 | 59 | 59 | 59 | 18 | 18 | 18 | 4 | 4 | 4 | 4 | 4 | 4 | 11 | 11 | 11 | 11 |
| Relative Humidity (%) | 56 | 58 | 63 | 69 | 75 | 84 | 86 | 87 | 88 | 89 | 89 | 90 | 90 | 90 | 88 | 83 | 77 | 72 | 66 | 62 | 59 | 58 | 58 | 59 |
| Rain | SChc | SChc | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Thunder | -- | -- | Chc | Chc | Chc | Lkly | Lkly | Lkly | Lkly | Lkly | Lkly | SChc | SChc | SChc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
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