Weather History for KSFO - May, 2019
| Actual | Average | Record | |
|---|---|---|---|
| Temperature | |||
| Mean Temperature | 53 °F | 60 °F | |
| Max Temperature | 56 °F | 68 °F | 85 °F (1978) |
| Min Temperature | 50 °F | 52 °F | 42 °F (1974) |
| Degree Days | |||
| Heating Degree Days | 12 | 6 | |
| Month to date heating degree days | 112 | 114 | |
| Since 1 July heating degree days | 2231 | 2482 | |
| Cooling Degree Days | 0 | 0 | |
| Month to date cooling degree days | 0 | 0 | |
| Year to date cooling degree days | 9 | 6 | |
| Growing Degree Days | 2 (Base 50) | ||
| Moisture | |||
| Dew Point | 49 °F | ||
| Average Humidity | 80 | ||
| Maximum Humidity | 93 | ||
| Minimum Humidity | 66 | ||
| Precipitation | |||
| Precipitation | 0.84 in | 0.02 in | 1.23 in (1957) |
| Month to date precipitation | 1.60 | 0.33 | |
| Year to date precipitation | 18.03 | 12.83 | |
| Sea Level Pressure | |||
| Sea Level Pressure | 29.88 in | ||
| Wind | |||
| Wind Speed | 10 mph (SSE) | ||
| Max Wind Speed | 30 mph | ||
| Max Gust Speed | 33 mph | ||
| Visibility | 8 miles | ||
| Events | Rain | ||
| T = Trace of Precipitation, MM = Missing Value | Source: NWS Daily Summary |
Daily Weather History Graph
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Astronomy
| May. 18, 2019 | Rise | Set |
|---|---|---|
| Actual Time | 5:57 AM PDT | 8:14 PM PDT |
| Civil Twilight | 5:28 AM PDT | 8:44 PM PDT |
| Nautical Twilight | 4:51 AM PDT | 9:20 PM PDT |
| Astronomical Twilight | 4:12 AM PDT | 10:00 PM PDT |
| Moon | 8:16 PM PDT (5/18) | 6:06 AM PDT (5/18) |
| Length of Visible Light | 15h 16m | |
| Length of Day |
14h 16m
|
|
| Full, 100% of the Moon is Illuminated | ||||
| May 18 Full | May 18 Full | May 26 Last Quarter | Jun 3 New | Jun 9 First Quarter |
Hourly Weather History & Observations
| Time (PDT) | Temp. | Dew Point | Humidity | Pressure | Visibility | Wind Dir | Wind Speed | Gust Speed | Precip | Events | Conditions |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 12:56 AM | 53.1 °F | 46.0 °F | 77% | 30.05 in | 10.0 mi | WSW | 5.8 mph | - | N/A | Scattered Clouds | |
| 1:56 AM | 53.1 °F | 46.0 °F | 77% | 30.02 in | 10.0 mi | SSW | 5.8 mph | - | N/A | Scattered Clouds | |
| 2:56 AM | 53.1 °F | 46.0 °F | 77% | 30.00 in | 10.0 mi | South | 4.6 mph | - | N/A | Scattered Clouds | |
| 3:56 AM | 52.0 °F | 46.0 °F | 80% | 29.99 in | 10.0 mi | SW | 4.6 mph | - | N/A | Scattered Clouds | |
| 4:56 AM | 53.1 °F | 46.0 °F | 77% | 29.97 in | 10.0 mi | SE | 4.6 mph | - | N/A | Mostly Cloudy | |
| 5:56 AM | 51.1 °F | 46.9 °F | 86% | 29.95 in | 10.0 mi | SSE | 6.9 mph | - | N/A | Mostly Cloudy | |
| 6:56 AM | 53.1 °F | 46.0 °F | 77% | 29.95 in | 10.0 mi | South | 4.6 mph | - | N/A | Mostly Cloudy | |
| 7:56 AM | 54.0 °F | 45.0 °F | 72% | 29.95 in | 10.0 mi | SE | 9.2 mph | - | N/A | Mostly Cloudy | |
| 8:56 AM | 55.9 °F | 45.0 °F | 67% | 29.94 in | 10.0 mi | South | 10.4 mph | - | N/A | Overcast | |
| 9:56 AM | 55.0 °F | 45.0 °F | 69% | 29.93 in | 10.0 mi | South | 8.1 mph | - | N/A | Overcast | |
| 10:56 AM | 55.9 °F | 45.0 °F | 67% | 29.92 in | 10.0 mi | SSE | 9.2 mph | - | N/A | Overcast | |
| 11:56 AM | 55.9 °F | 46.9 °F | 72% | 29.94 in | 10.0 mi | South | 10.4 mph | - | 0.01 in | Rain | Light Rain |
| 12:56 PM | 54.0 °F | 48.0 °F | 80% | 29.94 in | 6.0 mi | ESE | 12.7 mph | - | 0.07 in | Rain | Rain |
| 1:56 PM | 54.0 °F | 48.9 °F | 83% | 29.92 in | 8.0 mi | SE | 13.8 mph | - | 0.05 in | Rain | Light Rain |
| 2:56 PM | 55.9 °F | 50.0 °F | 80% | 29.91 in | 10.0 mi | SE | 10.4 mph | - | 0.00 in | Overcast | |
| 3:56 PM | 55.0 °F | 50.0 °F | 83% | 29.90 in | 7.0 mi | SE | 9.2 mph | - | 0.08 in | Rain | Rain |
| 4:32 PM | 55.0 °F | 50.0 °F | 83% | 29.83 in | 7.0 mi | ESE | 25.3 mph | - | 0.08 in | Rain | Rain |
| 4:56 PM | 53.1 °F | 50.0 °F | 89% | 29.84 in | 9.0 mi | SE | 23.0 mph | 33.4 mph | 0.09 in | Overcast | |
| 5:56 PM | 53.1 °F | 50.0 °F | 89% | 29.81 in | 9.0 mi | SE | 18.4 mph | - | 0.04 in | Rain | Light Rain |
| 6:56 PM | 53.1 °F | 51.1 °F | 93% | 29.79 in | 3.0 mi | SE | 15.0 mph | - | 0.06 in | Rain | Light Rain |
| 7:56 PM | 55.0 °F | 50.0 °F | 83% | 29.78 in | 10.0 mi | SE | 15.0 mph | - | 0.04 in | Overcast | |
| 8:56 PM | 55.0 °F | 51.1 °F | 86% | 29.78 in | 5.0 mi | SE | 13.8 mph | 21.9 mph | 0.04 in | Rain | Light Rain |
| 9:56 PM | 55.0 °F | 51.1 °F | 86% | 29.76 in | 7.0 mi | SE | 13.8 mph | - | 0.01 in | Rain | Light Rain |
| 10:56 PM | 55.0 °F | 52.0 °F | 89% | 29.77 in | 3.0 mi | South | 6.9 mph | - | 0.10 in | Rain | Rain |
| 11:01 PM | 54.0 °F | 51.1 °F | 90% | 29.77 in | 2.5 mi | SSE | 9.2 mph | - | 0.05 in | Rain | Heavy Rain |
| 11:15 PM | 54.0 °F | 51.1 °F | 90% | 29.77 in | 4.0 mi | ESE | 8.1 mph | - | 0.14 in | Rain | Light Rain |
| 11:22 PM | 54.0 °F | 51.1 °F | 90% | 29.77 in | 4.0 mi | ESE | 8.1 mph | - | 0.14 in | Rain | Light Rain |
| 11:44 PM | 55.0 °F | 51.1 °F | 86% | 29.77 in | 7.0 mi | SE | 4.6 mph | - | 0.15 in | Rain | Rain |
| 11:56 PM | 54.0 °F | 52.0 °F | 93% | 29.77 in | 3.0 mi | ESE | 3.5 mph | - | 0.21 in | Rain | Rain |