Port Jefferson, OH
Climate overview — based on NOAA 1991-2020 normals from SIDNEY 1 S, OH US.
Year-round temperatures (°F)
Climate summary
Port Jefferson has an annual average temperature of 50.9°F with about 41.7 inches of precipitation per year. The warmest month is July (average high 84.3°F), and the coldest is January (average low 17.9°F). June is typically the wettest month (4.70 in) and February the driest (2.31 in).
Best time to visit Port Jefferson
Full guide →Climate change signal
All-time records →97 of 366 (26.5%) of Port Jefferson's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1940s | 0 | |
| 1950s | 0 | |
| 1960s | 0 | |
| 1970s | 10 | |
| 1980s | 85 | |
| 1990s | 69 | |
| 2000s | 58 | |
| 2010s | 89 | |
| 2020s | 55 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 34.4°F | 17.9°F | 26.2°F | 2.89 in | — | 13 |
| February | 38.5°F | 20.1°F | 29.3°F | 2.31 in | — | 10 |
| March | 48.9°F | 28.0°F | 38.5°F | 3.17 in | — | 12 |
| April | 62.3°F | 37.8°F | 50.0°F | 4.08 in | — | 13 |
| May | 72.8°F | 49.1°F | 61.0°F | 4.08 in | — | 14 |
| June | 81.2°F | 58.9°F | 70.1°F | 4.70 in | — | 13 |
| July | 84.3°F | 62.1°F | 73.2°F | 4.57 in | — | 10 |
| August | 83.0°F | 59.8°F | 71.4°F | 3.76 in | — | 9 |
| September | 77.9°F | 52.5°F | 65.2°F | 3.11 in | — | 9 |
| October | 65.2°F | 41.5°F | 53.3°F | 2.89 in | — | 10 |
| November | 51.1°F | 31.5°F | 41.3°F | 3.17 in | — | 10 |
| December | 39.6°F | 23.9°F | 31.7°F | 2.92 in | — | 11 |
Climate twins of Port Jefferson
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).