Effingham weather in May: Effingham, Illinois: normal highs, lows, rain and records for May
Effingham in May has a normal high of 76°F and a normal low of 54°F, a daily mean of 65°F, rising from 72°F on the 1st to 81°F by the 31st. Measurable precipitation falls on 12 days in a normal May, 5.27 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 25°C and low of 12°C, 134 mm of precipitation in May.
- NOAA stationEffingham (3 mi SW)
- Station IDUSC00112687
- Location39.12°N 88.62°W
- Elevation625 ft (191 m)
- From the center4 miles
- Population12,434
- Jan 37° 20°
- Feb 43° 23°
- Mar 54° 32°
- Apr 66° 42°
- May 76° 54°
- Jun 85° 63°
- Jul 89° 66°
- Aug 87° 64°
- Sep 81° 56°
- Oct 69° 44°
- Nov 54° 34°
- Dec 42° 25°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Effingham in May?
The normal high is 76°F and the normal low 54°F, for a daily mean of 64.9°F. May is 10.7°F warmer than April and 9.1°F cooler than June. May is the 5th warmest month of the year in Effingham and the wettest. Across the month the normal high rises 9°F, from 72°F on May 1 to 81°F on May 31. From one year to the next May's mean temperature typically moves about 3.2°F either way (NOAA's standard deviation), so roughly two Mays in three average between 62°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 41%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 72°F | 48°F | 40% | 29% |
| May 8 | 74°F | 51°F | 41% | 29% |
| May 15 | 76°F | 53°F | 40% | 28% |
| May 22 | 78°F | 56°F | 39% | 27% |
| May 31 | 81°F | 59°F | 38% | 26% |
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 | 72°F | 48°F | 40% | 29% | 13 h 50 min |
| May 2 | 72°F | 49°F | 40% | 29% | 13 h 50 min |
| May 3 | 72°F | 49°F | 40% | 29% | 13 h 50 min |
| May 4 | 73°F | 49°F | 40% | 29% | 14 h |
| May 5 | 73°F | 50°F | 41% | 29% | 14 h |
| May 6 | 73°F | 50°F | 41% | 29% | 14 h |
| May 7 | 73°F | 51°F | 41% | 29% | 14 h |
| May 8 | 74°F | 51°F | 41% | 29% | 14 h |
| May 9 | 74°F | 51°F | 41% | 29% | 14 h 10 min |
| May 10 | 74°F | 52°F | 40% | 29% | 14 h 10 min |
| May 11 | 75°F | 52°F | 40% | 29% | 14 h 10 min |
| May 12 | 75°F | 52°F | 40% | 29% | 14 h 10 min |
| May 13 | 75°F | 53°F | 40% | 28% | 14 h 10 min |
| May 14 | 76°F | 53°F | 40% | 28% | 14 h 20 min |
| May 15 | 76°F | 53°F | 40% | 28% | 14 h 20 min |
| May 16 | 76°F | 54°F | 40% | 28% | 14 h 20 min |
| May 17 | 77°F | 54°F | 40% | 28% | 14 h 20 min |
| May 18 | 77°F | 54°F | 39% | 28% | 14 h 20 min |
| May 19 | 77°F | 55°F | 39% | 27% | 14 h 20 min |
| May 20 | 77°F | 55°F | 39% | 27% | 14 h 30 min |
| May 21 | 78°F | 55°F | 39% | 27% | 14 h 30 min |
| May 22 | 78°F | 56°F | 39% | 27% | 14 h 30 min |
| May 23 | 78°F | 56°F | 39% | 27% | 14 h 30 min |
| May 24 | 79°F | 56°F | 38% | 27% | 14 h 30 min |
| May 25 | 79°F | 57°F | 38% | 26% | 14 h 30 min |
| May 26 | 79°F | 57°F | 38% | 26% | 14 h 40 min |
| May 27 | 80°F | 57°F | 38% | 26% | 14 h 40 min |
| May 28 | 80°F | 58°F | 38% | 26% | 14 h 40 min |
| May 29 | 80°F | 58°F | 38% | 26% | 14 h 40 min |
| May 30 | 81°F | 58°F | 38% | 26% | 14 h 40 min |
| May 31 | 81°F | 59°F | 38% | 26% | 14 h 40 min |
- Normal high
- 76°FMay average
- Normal low
- 54°FMay average
- Precipitation
- 5.27 inmonth total
- Days with precipitation
- 120.01 inch or more
- Days at 90°F or more
- 1
- Daylight
- 13 h 50 min to 14 h 40 minMay 1 to May 31
- Days at 70°F or more
- 23
- Days at 80°F or more
- 12
- Sunshine
- 73%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00112687; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Effingham in May?
On a given May day the chance of 0.01 inch or more is 39% on average, highest around May 5 (41%). In all, 5.27 in falls on 12 days of a normal May, 1 of them with an inch or more.
In a normal May in Effingham, 1 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00112687.
What are the records for May in Effingham?
The warmest May temperature on this station's record (since 1892) is 98°F, on May 31, 1934; the coldest is 28°F, on May 1, 1903. The wettest May brought 12.89 in (1943).
Source: records: ACIS, station USC00112687. Records and recent months use complete months only.
How does May in Effingham compare across Illinois?
Across the 144 places PlainClimate covers in Illinois, May normal highs run from 67°F in Waukegan to 79°F in Belleville; Effingham's is 76°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.