Lebanon weather in May: Lebanon, Pennsylvania: normal highs, lows, rain and records for May
Lebanon in May has a normal high of 72°F and a normal low of 51°F, a daily mean of 61°F, rising from 68°F on the 1st to 76°F by the 31st. Measurable precipitation falls on 13 days in a normal May, 3.99 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 22°C and low of 10°C, 101 mm of precipitation in May.
- NOAA stationLebanon (2 mi W)
- Station IDUSC00364896
- Location40.33°N 76.47°W
- Elevation450 ft (137 m)
- Population26,456
- Jan 37° 22°
- Feb 40° 23°
- Mar 49° 31°
- Apr 62° 40°
- May 72° 51°
- Jun 80° 60°
- Jul 84° 64°
- Aug 82° 63°
- Sep 76° 55°
- Oct 64° 44°
- Nov 52° 34°
- Dec 42° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Lebanon in May?
The normal high is 72°F and the normal low 51°F, for a daily mean of 61.2°F. May is 10.1°F warmer than April and 8.7°F cooler than June. May is the 5th warmest month of the year in Lebanon and the 6th wettest. Across the month the normal high rises 8°F, from 68°F on May 1 to 76°F on May 31. From one year to the next May's mean temperature typically moves about 3.1°F either way (NOAA's standard deviation), so roughly two Mays in three average between 58°F and 64°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 | 68°F | 46°F | 41% | 24% |
| May 8 | 70°F | 48°F | 41% | 25% |
| May 15 | 72°F | 50°F | 41% | 25% |
| May 22 | 73°F | 53°F | 40% | 25% |
| May 31 | 76°F | 55°F | 40% | 25% |
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 | 68°F | 46°F | 41% | 24% | 13 h 50 min |
| May 2 | 68°F | 46°F | 41% | 24% | 14 h |
| May 3 | 69°F | 46°F | 41% | 24% | 14 h |
| May 4 | 69°F | 47°F | 41% | 24% | 14 h |
| May 5 | 69°F | 47°F | 41% | 25% | 14 h |
| May 6 | 70°F | 47°F | 41% | 25% | 14 h |
| May 7 | 70°F | 48°F | 41% | 25% | 14 h 10 min |
| May 8 | 70°F | 48°F | 41% | 25% | 14 h 10 min |
| May 9 | 70°F | 48°F | 41% | 25% | 14 h 10 min |
| May 10 | 71°F | 49°F | 41% | 25% | 14 h 10 min |
| May 11 | 71°F | 49°F | 41% | 25% | 14 h 20 min |
| May 12 | 71°F | 49°F | 41% | 25% | 14 h 20 min |
| May 13 | 71°F | 50°F | 41% | 25% | 14 h 20 min |
| May 14 | 72°F | 50°F | 41% | 25% | 14 h 20 min |
| May 15 | 72°F | 50°F | 41% | 25% | 14 h 20 min |
| May 16 | 72°F | 51°F | 41% | 25% | 14 h 20 min |
| May 17 | 72°F | 51°F | 41% | 25% | 14 h 30 min |
| May 18 | 72°F | 51°F | 41% | 25% | 14 h 30 min |
| May 19 | 73°F | 52°F | 41% | 25% | 14 h 30 min |
| May 20 | 73°F | 52°F | 40% | 25% | 14 h 30 min |
| May 21 | 73°F | 52°F | 40% | 25% | 14 h 30 min |
| May 22 | 73°F | 53°F | 40% | 25% | 14 h 40 min |
| May 23 | 74°F | 53°F | 40% | 25% | 14 h 40 min |
| May 24 | 74°F | 53°F | 40% | 25% | 14 h 40 min |
| May 25 | 74°F | 54°F | 40% | 25% | 14 h 40 min |
| May 26 | 74°F | 54°F | 40% | 25% | 14 h 40 min |
| May 27 | 75°F | 54°F | 40% | 25% | 14 h 40 min |
| May 28 | 75°F | 54°F | 40% | 25% | 14 h 40 min |
| May 29 | 75°F | 55°F | 40% | 25% | 14 h 50 min |
| May 30 | 75°F | 55°F | 40% | 25% | 14 h 50 min |
| May 31 | 76°F | 55°F | 40% | 25% | 14 h 50 min |
- Normal high
- 72°FMay average
- Normal low
- 51°FMay average
- Precipitation
- 3.99 inmonth total
- Days with precipitation
- 130.01 inch or more
- Daylight
- 13 h 50 min to 14 h 50 minMay 1 to May 31
- Days at 70°F or more
- 18
- Days at 80°F or more
- 7
- Sunshine
- 69%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00364896; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Lebanon in May?
On a given May day the chance of 0.01 inch or more is 40% on average, highest around May 9 (41%). In all, 3.99 in falls on 13 days of a normal May, 1 of them with an inch or more.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00364896.
What are the records for May in Lebanon?
The warmest May temperature on this station's record (since 1965) is 95°F, on May 30, 1969; the coldest is 27°F, on May 11, 1966. The wettest May brought 9.36 in (2025).
The May mean against the 1991-2020 normal of 61.2°F: 2021 60.0°F (−1.2), 2022 63.1°F (+1.9), 2023 59.0°F (−2.2), 2024 64.0°F (+2.8), 2025 61.0°F (−0.2), 2026 61.8°F (+0.6). 3 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 60.0°F | −1.2°F | 4.70 in |
| 2022 | 63.1°F | +1.9°F | 6.27 in |
| 2023 | 59.0°F | −2.2°F | 0.15 in |
| 2024 | 64.0°F | +2.8°F | 4.22 in |
| 2025 | 61.0°F | −0.2°F | 9.36 in |
| 2026 | 61.8°F | +0.6°F | 2.62 in |
Source: records: ACIS, station USC00364896; recent months: ACIS, station USC00364896. Records and recent months use complete months only.
How does May in Lebanon compare across Pennsylvania?
Across the 108 places PlainClimate covers in Pennsylvania, May normal highs run from 65°F in Laporte to 75°F in Phoenixville; Lebanon's is 72°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.