Houston endures about 104 more days above 90 °F each year.
Houston enjoys about 68 more sunny days a year than Mercer Island. Houston sees rain or snow on roughly 51 fewer days each year.
The year at a glance
Averages from 30 years of climate history, 1991-2020
| Houston | Metric | Mercer Island |
|---|---|---|
| 215 days | Sunny daysclear or partly cloudy skies | 147 days |
| 52 in | Precipitationper year | 52 in |
| 104 days | Wet daysrain or snow per year | 155 days |
| 0 in | Snowfallper year | 6 in |
| 107 days | Hot daysabove 90 °F | 3 days |
| 5 days | Freezing nightsat or below 32 °F | 29 days |
| 75% | Humidityaverage relative | 79% |
| 71 °F | Average temperatureyear round | 54 °F |
Monthly temperatures
Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.
Daily highs
Daily lows
View monthly temperatures as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Houston high | 63 | 67 | 73 | 79 | 86 | 91 | 93 | 94 | 90 | 82 | 72 | 65 |
| Mercer Island high | 48 | 51 | 55 | 60 | 66 | 71 | 77 | 77 | 72 | 61 | 53 | 47 |
| Houston low | 45 | 49 | 54 | 61 | 69 | 75 | 77 | 77 | 72 | 63 | 53 | 46 |
| Mercer Island low | 37 | 37 | 39 | 43 | 49 | 54 | 57 | 58 | 54 | 46 | 40 | 37 |
Monthly precipitation
Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.
View monthly precipitation as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Houston | 4.5 | 3.6 | 3.9 | 4.3 | 4.1 | 4.9 | 3.8 | 4.1 | 4.9 | 4.6 | 4.5 | 4.7 |
| Mercer Island | 6.9 | 4.8 | 5.5 | 4.5 | 3.0 | 2.3 | 1.0 | 1.3 | 2.6 | 5.3 | 7.6 | 7.0 |
Monthly sunny days
Days each month with clear or partly cloudy skies, so compare the same month between cities.
View monthly sunny days as a table
| City | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Houston | 15 | 13 | 15 | 16 | 18 | 21 | 21 | 21 | 21 | 22 | 18 | 15 |
| Mercer Island | 7 | 10 | 9 | 10 | 12 | 13 | 20 | 21 | 18 | 12 | 8 | 7 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Houston vs another city
- Houston vs West University Place, TX
- Houston vs Bellaire, TX
- Houston vs Aldine, TX
- Houston vs Jacinto City, TX
- Houston vs Galena Park, TX
- Houston vs Cloverleaf, TX
- Houston vs New York, NY
- Houston vs Los Angeles, CA
- Houston vs Chicago, IL
- Houston vs Phoenix, AZ
- Houston vs Philadelphia, PA
- Houston vs San Antonio, TX
Mercer Island vs another city
- Mercer Island vs Newcastle, WA
- Mercer Island vs Bellevue, WA
- Mercer Island vs Bryn Mawr-Skyway, WA
- Mercer Island vs Renton, WA
- Mercer Island vs Tukwila, WA
- Mercer Island vs White Center, WA
- Mercer Island vs New York, NY
- Mercer Island vs Los Angeles, CA
- Mercer Island vs Chicago, IL
- Mercer Island vs Phoenix, AZ
- Mercer Island vs Philadelphia, PA
About this data
Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.
Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).