San Tan Valley, AZ weather in January
In January, San Tan Valley sees highs around 68°F and lows around 37°F: mild and mostly dry. There are about 4 days with rain. It is one of the coolest months in San Tan Valley. Great for outdoor plans.
- Normal high
- 68°F
- Normal low
- 37°F
- Wet days
- 4
- 1.0 in total
- Muggy days
- 0
- dew point 65°F+
How January changes from start to finish
| January 1 | January 31 | |
|---|---|---|
| Normal high | 66°F | 70°F |
| Normal low | 36°F | 38°F |
| Chance of a wet day | 14% | 14% |
| Sunrise / sunset | 7:29 am / 5:29 pm | 7:22 am / 5:56 pm |
| Daylight | 10.0 h | 10.6 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Arizona time (no daylight saving)).
A typical January day
- 6 am48°Fdew point 33°F
- 9 am51°Fdew point 33°F
- Noon61°Fdew point 31°F
- 3 pm66°Fdew point 29°F
- 6 pm64°Fdew point 30°F
- 9 pm57°Fdew point 33°F
NOAA hourly normals (local standard time) from Phoenix Sky Harbor Intl Airport (32 mi away); average wind 5 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F20 of 31
- Hot dayshigh 90°F or more0 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow4 of 31
- Notable rainat least 0.10 in2 of 31
- Freezing nightslow 32°F or below9 of 31
Average days per January, counted from daily records for each year 1991-2020.
Rain in January
Normal precipitation is 1.0 in; a dry January brings about 0.05 in and a wet one about 1.5 in (25th and 75th percentiles). About 1 day brings half an inch or more. Snow is very rare.
How January varies from year to year
- Warmest January, 1991-20202003: average high 75°F
- Coolest January2001: average high 63°F
- Wettest January1993: 3.9 in
- Driest January2006: no measurable precipitation
- Highest reading85°F (January 26, 2000)
- Lowest reading14°F (January 15, 2013)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
January compared with December and February
| December | January | February | |
|---|---|---|---|
| Normal high | 67°F | 68°F | 71°F |
| Normal low | 36°F | 37°F | 40°F |
| Wet days | 4 | 4 | 4 |
| Comfortable days | 20 | 20 | 18 |
| Daylight | 10.0 h | 10.2 h | 11.0 h |
Highs change by +1°F from December and +3°F into February.
Nearby alternatives in January
- Cooler: Sedona, AZ117 mi · high 58°F · 6 wet days
How San Tan Valley ranks in January
- Normal high51st warmest of 378 cities; 5th of 13 in Arizona
- Wet days29th driest of 378
- Comfortable days7th most of 339
What to pack for San Tan Valley in January
- A warm jacket – lows near 37°F, highs near 68°F
- Layers – afternoons near 68°F but nights near 37°F
Heating and cooling
January has 394 heating degree days and 1 cooling degree days (base 65°F), 8% of the year's total heating and cooling demand.
Questions
How cold is San Tan Valley in January?
The normal high is 68°F and the normal low is 37°F. From 1991 to 2020 the coldest January reading was 14°F (January 15, 2013).
Does it rain a lot in San Tan Valley in January?
About 4 days in January have at least 0.01 in of precipitation, and the normal total is 1.0 in. The wettest January in 1991-2020 was in 1993 (3.9 in); the driest was in 2006, with no measurable precipitation.
Does it snow in San Tan Valley in January?
Snow is very rare: the 1991-2020 normal for January rounds to 0.0 in.
Is January a good time to visit San Tan Valley?
January ranks 2nd of 12 months on our comfort score for San Tan Valley (72 out of 100). It has about 20 comfortable days. The best months are January, February and December.
Where the numbers come from
- Temperature, rain, snowfall and snow depth: Casa Grande Nm (USC00021314), 14 mi S of the city center, 1,419 ft (103 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Frost dates: Chandler Heights (USC00021514), 9.0 mi W of the city center, 1,425 ft (97 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Phoenix Sky Harbor Intl Airport (USW00023183), 32 mi WNW of the city center, 1,107 ft (415 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Phoenix Sky Harbor Intl Airport (722780-23183), 32 mi WNW of the city center, 1,113 ft (409 ft lower than the city). Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).