Rockville weather in January: Rockville, Maryland: normal highs, lows, rain and records for January
Rockville in January has a normal high of 42°F and a normal low of 27°F, a daily mean of 35°F, holding near 42°F all month. Measurable precipitation falls on 10 days in a normal January, 3.11 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 6°C and low of −3°C, 79 mm of precipitation in January.
- NOAA stationRockville (1 mi NE)
- Station IDUSC00187705
- Location39.10°N 77.15°W
- Elevation440 ft (134 m)
- From the center1 miles
- Population68,417
- Jan 42° 27°
- Feb 45° 28°
- Mar 54° 36°
- Apr 66° 46°
- May 74° 55°
- Jun 82° 64°
- Jul 87° 69°
- Aug 85° 67°
- Sep 78° 60°
- Oct 66° 48°
- Nov 56° 38°
- Dec 46° 31°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Rockville in January?
The normal high is 42°F and the normal low 27°F, for a daily mean of 34.5°F. January is 4.0°F cooler than December and 2.2°F cooler than February. January is the 12th warmest month of the year in Rockville and the 10th wettest. From one year to the next January's mean temperature typically moves about 4.1°F either way (NOAA's standard deviation), so roughly two Januarys in three average between 30°F and 39°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 32%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| January 1 | 43°F | 28°F | 32% | 19% |
| January 8 | 42°F | 28°F | 32% | 20% |
| January 15 | 42°F | 27°F | 31% | 19% |
| January 22 | 42°F | 26°F | 30% | 19% |
| January 31 | 43°F | 26°F | 28% | 18% |
Every day of January: normal high, low and chance of precipitation (warmest afternoon January 1, coldest night January 25)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| January 1 | 43°F | 28°F | 32% | 19% | 9 h 30 min |
| January 2 | 43°F | 28°F | 32% | 19% | 9 h 30 min |
| January 3 | 43°F | 28°F | 32% | 20% | 9 h 30 min |
| January 4 | 43°F | 28°F | 32% | 20% | 9 h 30 min |
| January 5 | 43°F | 28°F | 32% | 20% | 9 h 30 min |
| January 6 | 42°F | 28°F | 32% | 20% | 9 h 30 min |
| January 7 | 42°F | 28°F | 32% | 20% | 9 h 30 min |
| January 8 | 42°F | 28°F | 32% | 20% | 9 h 30 min |
| January 9 | 42°F | 27°F | 32% | 20% | 9 h 30 min |
| January 10 | 42°F | 27°F | 32% | 20% | 9 h 40 min |
| January 11 | 42°F | 27°F | 32% | 20% | 9 h 40 min |
| January 12 | 42°F | 27°F | 32% | 19% | 9 h 40 min |
| January 13 | 42°F | 27°F | 32% | 19% | 9 h 40 min |
| January 14 | 42°F | 27°F | 31% | 19% | 9 h 40 min |
| January 15 | 42°F | 27°F | 31% | 19% | 9 h 40 min |
| January 16 | 42°F | 27°F | 31% | 19% | 9 h 40 min |
| January 17 | 42°F | 27°F | 31% | 19% | 9 h 40 min |
| January 18 | 42°F | 27°F | 31% | 19% | 9 h 50 min |
| January 19 | 42°F | 27°F | 31% | 19% | 9 h 50 min |
| January 20 | 42°F | 26°F | 31% | 19% | 9 h 50 min |
| January 21 | 42°F | 26°F | 30% | 19% | 9 h 50 min |
| January 22 | 42°F | 26°F | 30% | 19% | 9 h 50 min |
| January 23 | 42°F | 26°F | 30% | 19% | 9 h 50 min |
| January 24 | 42°F | 26°F | 30% | 19% | 10 h |
| January 25 | 42°F | 26°F | 29% | 19% | 10 h |
| January 26 | 42°F | 26°F | 29% | 19% | 10 h |
| January 27 | 42°F | 26°F | 29% | 19% | 10 h |
| January 28 | 42°F | 26°F | 29% | 19% | 10 h |
| January 29 | 42°F | 26°F | 28% | 18% | 10 h 10 min |
| January 30 | 42°F | 26°F | 28% | 18% | 10 h 10 min |
| January 31 | 43°F | 26°F | 28% | 18% | 10 h 10 min |
- Normal high
- 42°FJanuary average
- Normal low
- 27°FJanuary average
- Precipitation
- 3.11 inmonth total
- Days with precipitation
- 100.01 inch or more
- Nights at 32°F or colder
- 22
- Daylight
- 9 h 30 min to 10 h 10 minJanuary 1 to January 31
- Days at 70°F or more
- 1
- Sunshine
- 65%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00187705; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Rockville in January?
On a given January day the chance of 0.01 inch or more is 31% on average, highest around January 4 (32%). In all, 3.11 in falls on 10 days of a normal January, 1 of them with an inch or more.
In a normal January in Rockville, 22 nights fall to freezing and 6 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00187705.
What are the records for January in Rockville?
The warmest January temperature on this station's record (since 1907) is 78°F, on January 26, 1950; the coldest is −13°F, on January 21, 1985. The wettest January brought 8.17 in (1979); the snowiest, 35.6 inches (1996).
Source: records: ACIS, station USC00187705. Records and recent months use complete months only.
How does January in Rockville compare across Maryland?
Across the 26 places PlainClimate covers in Maryland, January normal highs run from 34°F in Frostburg to 49°F in Snow Hill; Rockville's is 42°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.