Merrillville Weather in January
Average highs run from 33°F on January 1 to 33°F on January 31, and lows from 20°F to 18°F. Normal precipitation for the month is 2.38 in over about 13 wet days.
January day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
January at a glance
- Average high
- 32°F
- Average low
- 18°F
- Precipitation
- 2.38 in
- Snowfall
- 14.6 in
- Record high
- 65°FJan 8, 2008
- Record low
- -27°FJan 20, 1985
- Chance of a freeze
- 100%
- Daylight
- 9 h 14 min to 10 h 02 min
- Cloud cover
- 70%
- Humidity
- 87%
- Dew point
- 20°F
- Wind
- 13.0 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Jan 1 | 33°F | 20°F | 57°F 2005 | -15°F 1968 | 39% | 22% |
| Jan 2 | 33°F | 19°F | 55°F 2005 | -14°F 1979 | 39% | 22% |
| Jan 3 | 33°F | 19°F | 61°F 2000 | -14°F 2018 | 39% | 23% |
| Jan 4 | 33°F | 19°F | 59°F 1997 | -11°F 1959 | 39% | 23% |
| Jan 5 | 33°F | 19°F | 64°F 1997 | -20°F 1999 | 39% | 23% |
| Jan 6 | 33°F | 19°F | 55°F 1998 | -18°F 1988 | 39% | 24% |
| Jan 7 | 32°F | 18°F | 60°F 2008 | -17°F 2014 | 39% | 24% |
| Jan 8 | 32°F | 18°F | 65°F 2008 | -13°F 2014 | 39% | 24% |
| Jan 9 | 32°F | 18°F | 65°F 2008 | -12°F 1962 | 39% | 24% |
| Jan 10 | 32°F | 18°F | 58°F 1975 | -18°F 1982 | 39% | 24% |
| Jan 11 | 32°F | 18°F | 55°F 2018 | -13°F 1977 | 39% | 24% |
| Jan 12 | 32°F | 17°F | 59°F 1960 | -14°F 1974 | 39% | 24% |
| Jan 13 | 32°F | 17°F | 61°F 2005 | -8°F 1957 | 39% | 25% |
| Jan 14 | 32°F | 17°F | 47°F 2006 | -14°F 1957 | 38% | 25% |
| Jan 15 | 32°F | 17°F | 56°F 1953 | -18°F 1979 | 38% | 24% |
| Jan 16 | 32°F | 17°F | 51°F 1990 | -22°F 1977 | 38% | 24% |
| Jan 17 | 32°F | 17°F | 56°F 1990 | -22°F 1977 | 38% | 24% |
| Jan 18 | 32°F | 17°F | 58°F 1996 | -20°F 1994 | 38% | 24% |
| Jan 19 | 32°F | 17°F | 59°F 1996 | -20°F 1994 | 38% | 24% |
| Jan 20 | 32°F | 17°F | 55°F 2006 | -27°F 1985 | 37% | 24% |
| Jan 21 | 32°F | 17°F | 54°F 1957 | -25°F 1985 | 37% | 23% |
| Jan 22 | 32°F | 17°F | 60°F 2017 | -14°F 1970 | 37% | 23% |
| Jan 23 | 32°F | 17°F | 56°F 1967 | -17°F 1963 | 36% | 23% |
| Jan 24 | 32°F | 17°F | 65°F 1967 | -16°F 1963 | 36% | 22% |
| Jan 25 | 32°F | 17°F | 52°F 1973 | -8°F 1963 | 36% | 22% |
| Jan 26 | 32°F | 17°F | 52°F 1974 | -13°F 1982 | 35% | 22% |
| Jan 27 | 32°F | 17°F | 54°F 2002 | -16°F 1955 | 35% | 21% |
| Jan 28 | 32°F | 17°F | 54°F 1970 | -16°F 1963 | 34% | 21% |
| Jan 29 | 32°F | 17°F | 57°F 2013 | -16°F 1966 | 34% | 20% |
| Jan 30 | 32°F | 18°F | 59°F 2013 | -21°F 2019 | 33% | 20% |
| Jan 31 | 33°F | 18°F | 55°F 1988 | -23°F 2019 | 33% | 19% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- January 1
- sunrise 7:16 AM, sunset 4:30 PM
- January 31
- sunrise 7:02 AM, sunset 5:04 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00128999 (Valparaiso Wtr Wks), public domain. Records: NOAA GHCN-Daily, station USC00116616, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.