Weather and climate in Rio Grande, NJ
What the weather is like in Rio Grande
The warmest month in Rio Grande is July, with average highs of 80°F. The coolest is January, when nights average 32°F. About 45.7 in of rain and snow falls in a typical year, most in August and least in January.
Skies are clearest in September (50% average cloud cover) and cloudiest in January (62%). Combining cloud with the length of truly dark nights, November, October, September offer the most clear, dark hours for stargazing.
Clear, dark hours per night
Hours of full astronomical darkness in mid-month, multiplied by the average share of clear sky. A rough guide to how much good observing time a typical night offers.
Monthly averages
| Month | High | Low | Precipitation | Cloud cover | Humidity | Wind | Dark hours |
|---|---|---|---|---|---|---|---|
| January | 41°F | 32°F | 3.0 in | 62% | 80% | 12 mph | 11.1 h |
| February | 41°F | 33°F | 3.1 in | 61% | 80% | 11 mph | 10.2 h |
| March | 47°F | 38°F | 3.8 in | 59% | 80% | 11 mph | 9.1 h |
| April | 57°F | 47°F | 3.6 in | 57% | 80% | 10 mph | 7.6 h |
| May | 65°F | 56°F | 3.5 in | 59% | 83% | 9 mph | 6.1 h |
| June | 75°F | 67°F | 4.1 in | 56% | 82% | 8 mph | 5.1 h |
| July | 80°F | 73°F | 4.4 in | 52% | 81% | 7 mph | 5.6 h |
| August | 80°F | 73°F | 4.5 in | 51% | 79% | 8 mph | 7.0 h |
| September | 75°F | 68°F | 3.7 in | 50% | 78% | 9 mph | 8.6 h |
| October | 66°F | 57°F | 4.4 in | 54% | 78% | 11 mph | 9.9 h |
| November | 55°F | 47°F | 3.5 in | 56% | 79% | 11 mph | 10.9 h |
| December | 46°F | 38°F | 4.2 in | 62% | 80% | 11 mph | 11.4 h |
Climate nearby
Climate averages: NASA POWER, 2001–2025, for the grid area around 39.00, -75.00 (about 50 km across). High and low temperatures are estimated from the monthly mean and the average daily range. Hills, coasts and cities can differ from the area average. Aurora outlook for Rio Grande · Sources and methods.