Climate averages 1991–2020
Hammond weather
in July.
A warm, wet month: the warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a warm month in Hammond: daytime highs average 27.3°C and nights cool to about 20.2°C. By daytime temperature it is the warmest month of the year.
Expect about 97 mm of rain on roughly 12 days, which makes July a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 52 min on an average July day.
The nearest other city in this atlas is Gary (13 km away). In July its highs average 27.1°C, about as warm as Hammond, with 98 mm of rain.
Among the 498 cities listed in the United States, Hammond ranks joint 406th of 498 for the warmest July highs and joint 363rd of 498 for the driest July (rainfall, lowest first). The mean July high of those 498 cities is 30.3°C; Hammond is 3.0°C cooler than that mean.
From July to August, average highs fall by 0.8°C to 26.5°C, and monthly rainfall falls from 97 mm to 94 mm.
The annual picture
July in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Hammond climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.5°C-7.2°C | -7.2°C | 63 | 9.1 | 9.510 h |
| February | 1.4°C-6.1°C | -6.1°C | 54 | 7.7 | 10.611 h |
| March | 6.6°C-1.2°C | -1.2°C | 77 | 10.6 | 11.912 h |
| April | 13.1°C4.9°C | 4.9°C | 110 | 12.5 | 13.313 h |
| May | 19.5°C11.6°C | 11.6°C | 113 | 12.1 | 14.515 h |
| June | 25.0°C17.5°C | 17.5°C | 102 | 11.7 | 15.115 h |
| July, selected | 27.3°C20.2°C | 20.2°C | 97 | 11.9 | 14.915 h |
| August | 26.5°C19.6°C | 19.6°C | 94 | 10.6 | 13.814 h |
| September | 22.9°C15.7°C | 15.7°C | 77 | 8.7 | 12.513 h |
| October | 16.2°C9.3°C | 9.3°C | 83 | 9.7 | 11.111 h |
| November | 8.6°C2.5°C | 2.5°C | 72 | 9.1 | 9.910 h |
| December | 2.5°C-3.3°C | -3.3°C | 58 | 8.4 | 9.29 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
July in nearby cities
- Gary in JulyUnited States · 13 kmHigh 27.1°C · Low 20.3°C · 98 mm rain
- Chicago in JulyUnited States · 32 kmHigh 27.3°C · Low 20.2°C · 92 mm rain
- Cicero in JulyUnited States · 36 kmHigh 27.8°C · Low 19.6°C · 92 mm rain
- Bolingbrook in JulyUnited States · 49 kmHigh 27.8°C · Low 18.8°C · 95 mm rain
- Joliet in JulyUnited States · 49 kmHigh 28.2°C · Low 19.1°C · 95 mm rain
- Evanston in JulyUnited States · 53 kmHigh 26.7°C · Low 20.7°C · 86 mm rain
- Naperville in JulyUnited States · 58 kmHigh 27.8°C · Low 18.9°C · 94 mm rain
- Arlington Heights in JulyUnited States · 69 kmHigh 27.4°C · Low 19.5°C · 90 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Hammond) is explained once on the Hammond year overview and on the Sources, method and limits page.