Weather and climate in Marrowstone, WA
What the weather is like in Marrowstone
The warmest month in Marrowstone is August, with average highs of 73°F. The coolest is February, when nights average 34°F. About 49.3 in of rain and snow falls in a typical year, most in November and least in July.
Skies are clearest in July (44% average cloud cover) and cloudiest in January (83%). Combining cloud with the length of truly dark nights, June, September, August 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 | 44°F | 35°F | 7.0 in | 83% | 91% | 2 mph | 11.5 h |
| February | 45°F | 34°F | 4.3 in | 76% | 87% | 2 mph | 10.2 h |
| March | 50°F | 37°F | 5.6 in | 79% | 85% | 2 mph | 8.6 h |
| April | 55°F | 41°F | 3.7 in | 73% | 81% | 1 mph | 6.4 h |
| May | 62°F | 47°F | 2.7 in | 67% | 79% | 1 mph | 3.9 h |
| June | 67°F | 51°F | 2.0 in | 64% | 79% | 1 mph | 25.4 h |
| July | 73°F | 55°F | 0.8 in | 44% | 76% | 1 mph | 2.9 h |
| August | 73°F | 56°F | 1.2 in | 46% | 75% | 1 mph | 5.6 h |
| September | 67°F | 51°F | 2.4 in | 54% | 78% | 1 mph | 7.9 h |
| October | 57°F | 44°F | 5.1 in | 70% | 84% | 1 mph | 9.7 h |
| November | 48°F | 39°F | 7.7 in | 79% | 89% | 2 mph | 11.2 h |
| December | 42°F | 34°F | 6.8 in | 83% | 91% | 2 mph | 11.8 h |
Climate averages: NASA POWER, 2001–2025, for the grid area around 48.00, -122.50 (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 Marrowstone · Sources and methods.