Rockville weather in May: Rockville, Maryland: normal highs, lows, rain and records for May
Rockville in May has a normal high of 74°F and a normal low of 55°F, a daily mean of 65°F, rising from 71°F on the 1st to 78°F by the 31st. Measurable precipitation falls on 11 days in a normal May, 3.55 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 24°C and low of 13°C, 90 mm of precipitation in May.
- 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 May?
The normal high is 74°F and the normal low 55°F, for a daily mean of 64.6°F. May is 8.9°F warmer than April and 8.3°F cooler than June. May is the 5th warmest month of the year in Rockville and the 5th wettest. Across the month the normal high rises 7°F, from 71°F on May 1 to 78°F on May 31. From one year to the next May's mean temperature typically moves about 3.3°F either way (NOAA's standard deviation), so roughly two Mays in three average between 61°F and 68°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 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 71°F | 51°F | 36% | 22% |
| May 8 | 73°F | 53°F | 37% | 23% |
| May 15 | 74°F | 55°F | 36% | 23% |
| May 22 | 76°F | 57°F | 36% | 23% |
| May 31 | 78°F | 59°F | 35% | 23% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 71°F | 51°F | 36% | 22% | 13 h 50 min |
| May 2 | 71°F | 51°F | 36% | 22% | 13 h 50 min |
| May 3 | 72°F | 51°F | 36% | 22% | 13 h 50 min |
| May 4 | 72°F | 52°F | 36% | 22% | 14 h |
| May 5 | 72°F | 52°F | 36% | 22% | 14 h |
| May 6 | 72°F | 52°F | 36% | 22% | 14 h |
| May 7 | 73°F | 53°F | 36% | 23% | 14 h |
| May 8 | 73°F | 53°F | 37% | 23% | 14 h |
| May 9 | 73°F | 53°F | 37% | 23% | 14 h 10 min |
| May 10 | 73°F | 53°F | 37% | 23% | 14 h 10 min |
| May 11 | 73°F | 54°F | 36% | 23% | 14 h 10 min |
| May 12 | 74°F | 54°F | 36% | 23% | 14 h 10 min |
| May 13 | 74°F | 54°F | 36% | 23% | 14 h 10 min |
| May 14 | 74°F | 54°F | 36% | 23% | 14 h 20 min |
| May 15 | 74°F | 55°F | 36% | 23% | 14 h 20 min |
| May 16 | 74°F | 55°F | 36% | 23% | 14 h 20 min |
| May 17 | 74°F | 55°F | 36% | 23% | 14 h 20 min |
| May 18 | 75°F | 56°F | 36% | 23% | 14 h 20 min |
| May 19 | 75°F | 56°F | 36% | 23% | 14 h 20 min |
| May 20 | 75°F | 56°F | 36% | 23% | 14 h 30 min |
| May 21 | 75°F | 56°F | 36% | 23% | 14 h 30 min |
| May 22 | 76°F | 57°F | 36% | 23% | 14 h 30 min |
| May 23 | 76°F | 57°F | 36% | 23% | 14 h 30 min |
| May 24 | 76°F | 57°F | 36% | 23% | 14 h 30 min |
| May 25 | 76°F | 57°F | 36% | 23% | 14 h 30 min |
| May 26 | 76°F | 58°F | 36% | 23% | 14 h 40 min |
| May 27 | 77°F | 58°F | 36% | 23% | 14 h 40 min |
| May 28 | 77°F | 58°F | 36% | 23% | 14 h 40 min |
| May 29 | 77°F | 58°F | 35% | 23% | 14 h 40 min |
| May 30 | 77°F | 59°F | 35% | 23% | 14 h 40 min |
| May 31 | 78°F | 59°F | 35% | 23% | 14 h 40 min |
- Normal high
- 74°FMay average
- Normal low
- 55°FMay average
- Precipitation
- 3.55 inmonth total
- Days with precipitation
- 110.01 inch or more
- Days at 90°F or more
- 2
- Daylight
- 13 h 50 min to 14 h 40 minMay 1 to May 31
- Days at 70°F or more
- 21
- Days at 80°F or more
- 9
- Sunshine
- 71%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 May?
On a given May day the chance of 0.01 inch or more is 36% on average, highest around May 8 (37%). In all, 3.55 in falls on 11 days of a normal May, 1 of them with an inch or more.
In a normal May in Rockville, 2 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00187705.
What are the records for May in Rockville?
The warmest May temperature on this station's record (since 1907) is 97°F, on May 28, 1914; the coldest is 29°F, on May 6, 1920. The wettest May brought 8.92 in (1989).
Source: records: ACIS, station USC00187705. Records and recent months use complete months only.
How does May in Rockville compare across Maryland?
Across the 26 places PlainClimate covers in Maryland, May normal highs run from 68°F in Frostburg to 78°F in Snow Hill; Rockville's is 74°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.