Cortland Weather in May
Average highs run from 66°F on May 1 to 74°F on May 31, and lows from 41°F to 52°F. Normal precipitation for the month is 4.20 in over about 14 wet days.
May day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
May at a glance
- Average high
- 71°F
- Average low
- 46°F
- Precipitation
- 4.20 in
- Record high
- 95°FMay 23, 1941
- Record low
- 24°FMay 7, 1970
- Chance of a freeze
- 45%
- Days of 90°F or more
- 0.6
- Daylight
- 14 h 00 min to 14 h 57 min
- Cloud cover
- 68%
- Humidity
- 76%
- Dew point
- 50°F
- Wind
- 4.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| May 1 | 66°F | 41°F | 85°F 1970 | 25°F 1978 | 46% | |
| May 2 | 67°F | 42°F | 92°F 1942 | 29°F 1961 | 46% | |
| May 3 | 67°F | 42°F | 88°F 2012 | 26°F 1986 | 46% | |
| May 4 | 67°F | 42°F | 88°F 1942 | 27°F 2002 | 46% | |
| May 5 | 68°F | 43°F | 90°F 1949 | 30°F 2005 | 46% | |
| May 6 | 68°F | 43°F | 90°F 1949 | 28°F 1968 | 46% | |
| May 7 | 68°F | 43°F | 85°F 1939 | 24°F 1970 | 46% | |
| May 8 | 69°F | 44°F | 89°F 2015 | 28°F 1950 | 46% | |
| May 9 | 69°F | 44°F | 89°F 1936 | 27°F 2020 | 46% | |
| May 10 | 69°F | 44°F | 87°F 1936 | 24°F 1966 | 46% | |
| May 11 | 69°F | 45°F | 92°F 1936 | 28°F 1966 | 46% | 0% |
| May 12 | 70°F | 45°F | 89°F 1936 | 31°F 1990 | 46% | 0% |
| May 13 | 70°F | 45°F | 88°F 1936 | 29°F 2013 | 45% | 0% |
| May 14 | 70°F | 46°F | 89°F 1962 | 28°F 2013 | 45% | 0% |
| May 15 | 71°F | 46°F | 87°F 1962 | 33°F 1969 | 45% | 0% |
| May 16 | 71°F | 46°F | 89°F 1962 | 30°F 1956 | 45% | 0% |
| May 17 | 71°F | 47°F | 90°F 1962 | 31°F 1956 | 45% | 0% |
| May 18 | 71°F | 47°F | 92°F 1962 | 30°F 2009 | 44% | 0% |
| May 19 | 72°F | 47°F | 88°F 1964 | 31°F 2002 | 44% | 0% |
| May 20 | 72°F | 48°F | 90°F 1962 | 29°F 2002 | 44% | 0% |
| May 21 | 72°F | 48°F | 88°F 1941 | 32°F 2002 | 44% | 0% |
| May 22 | 72°F | 49°F | 92°F 1941 | 30°F 2002 | 43% | 0% |
| May 23 | 73°F | 49°F | 95°F 1941 | 30°F 1967 | 43% | 0% |
| May 24 | 73°F | 49°F | 86°F 1936 | 25°F 1963 | 43% | 0% |
| May 25 | 73°F | 50°F | 89°F 2020 | 30°F 1956 | 43% | 0% |
| May 26 | 73°F | 50°F | 90°F 2020 | 30°F 1988 | 43% | 0% |
| May 27 | 73°F | 50°F | 92°F 1939 | 30°F 1969 | 43% | 0% |
| May 28 | 74°F | 51°F | 92°F 2018 | 34°F 1992 | 43% | 0% |
| May 29 | 74°F | 51°F | 91°F 1942 | 34°F 2004 | 43% | 0% |
| May 30 | 74°F | 51°F | 90°F 1942 | 34°F 1961 | 43% | 0% |
| May 31 | 74°F | 52°F | 90°F 2011 | 34°F 2001 | 43% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- May 1
- sunrise 6:20 AM, sunset 8:20 PM
- May 31
- sunrise 5:52 AM, sunset 8:49 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00335505 (Mosquito Creek Lake), public domain. Records: NOAA GHCN-Daily, station USW00014852, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.