Climate averages 1991–2020
Tracy weather
in January.
A cool, moderately wet month: the 11th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cool month in Tracy: daytime highs average 14.2°C and nights cool to about 5.0°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 85 mm of rain on roughly 9 days, which makes January a moderately wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 9 h 52 min on an average January day.
The nearest other city in this atlas is Manteca (20 km away). In January its highs average 13.8°C, about as warm as Tracy, with 84 mm of rain.
Among the 498 cities listed in the United States, Tracy ranks joint 157th of 498 for the warmest January highs and joint 318th of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Tracy is 4.8°C warmer than that mean.
From January to February, average highs rise by 1.7°C to 16.0°C, and monthly rainfall falls from 85 mm to 81 mm.
The annual picture
January in context
Monthly rainfall
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
Tracy climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January, selected | 14.2°C5.0°C | 5.0°C | 85 | 9.1 | 9.910 h |
| February | 16.0°C6.0°C | 6.0°C | 81 | 8.8 | 10.811 h |
| March | 18.6°C7.4°C | 7.4°C | 66 | 8.9 | 11.912 h |
| April | 21.7°C9.2°C | 9.2°C | 34 | 5.0 | 13.113 h |
| May | 26.4°C12.1°C | 12.1°C | 17 | 3.1 | 14.214 h |
| June | 30.9°C14.8°C | 14.8°C | 3.7 | 0.8 | 14.715 h |
| July | 33.6°C16.6°C | 16.6°C | 0.7 | 0.2 | 14.514 h |
| August | 32.9°C16.3°C | 16.3°C | 1.9 | 0.2 | 13.614 h |
| September | 30.7°C15.2°C | 15.2°C | 1.8 | 0.6 | 12.512 h |
| October | 25.3°C12.4°C | 12.4°C | 21 | 2.7 | 11.311 h |
| November | 18.3°C7.9°C | 7.9°C | 39 | 5.5 | 10.210 h |
| December | 14.0°C5.0°C | 5.0°C | 76 | 8.3 | 9.610 h |
Rainfall is the average of the 30 separate monthly totals. A rain 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
January in nearby cities
- Manteca in JanuaryUnited States · 20 kmHigh 13.8°C · Low 4.7°C · 84 mm rain
- Stockton in JanuaryUnited States · 27 kmHigh 13.7°C · Low 4.7°C · 102 mm rain
- Livermore in JanuaryUnited States · 31 kmHigh 13.9°C · Low 5.3°C · 86 mm rain
- Modesto in JanuaryUnited States · 39 kmHigh 14.0°C · Low 4.9°C · 92 mm rain
- Pleasanton in JanuaryUnited States · 40 kmHigh 14.1°C · Low 5.5°C · 86 mm rain
- Antioch in JanuaryUnited States · 44 kmHigh 13.9°C · Low 5.9°C · 93 mm rain
- San Ramon in JanuaryUnited States · 49 kmHigh 13.8°C · Low 5.3°C · 89 mm rain
- Fremont in JanuaryUnited States · 54 kmHigh 14.4°C · Low 6.0°C · 91 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 Tracy) is explained once on the Tracy year overview and on the Sources, method and limits page.