The year at a glance
Averages from 30 years of climate history, 1991-2020
| Chicago | Metric | Los Altos |
|---|---|---|
| 180 days | Sunny daysclear or partly cloudy skies | 257 days |
| 39 in | Precipitationper year | 26 in |
| 132 days | Wet daysrain or snow per year | 57 days |
| 37 in | Snowfallper year | 0 in |
| 16 days | Hot daysabove 90 °F | 11 days |
| 102 days | Freezing nightsat or below 32 °F | 5 days |
| 71% | Humidityaverage relative | 74% |
| 52 °F | Average temperatureyear round | 60 °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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chicago high | 32 | 36 | 46 | 57 | 68 | 78 | 83 | 81 | 75 | 62 | 49 | 37 |
| Los Altos high | 59 | 62 | 65 | 69 | 73 | 77 | 78 | 78 | 79 | 74 | 65 | 58 |
| Chicago low | 20 | 23 | 31 | 41 | 51 | 61 | 67 | 67 | 60 | 47 | 36 | 25 |
| Los Altos low | 42 | 44 | 46 | 48 | 52 | 55 | 58 | 58 | 56 | 52 | 45 | 41 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chicago | 2.4 | 2.1 | 2.8 | 4.5 | 4.4 | 4.0 | 3.6 | 3.8 | 3.0 | 3.3 | 2.8 | 2.4 |
| Los Altos | 5.1 | 5.3 | 4.0 | 1.8 | 0.9 | 0.2 | 0.0 | 0.0 | 0.1 | 1.2 | 2.4 | 4.7 |
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chicago | 10 | 11 | 14 | 13 | 15 | 16 | 20 | 20 | 20 | 16 | 14 | 11 |
| Los Altos | 14 | 14 | 16 | 19 | 22 | 26 | 29 | 29 | 28 | 25 | 19 | 16 |
Keep comparing
Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.
Chicago vs another city
- Chicago vs Cicero, IL
- Chicago vs Stickney, IL
- Chicago vs Berwyn, IL
- Chicago vs Oak Park, IL
- Chicago vs Riverside, IL
- Chicago vs Forest Park, IL
- Chicago vs New York, NY
- Chicago vs Los Angeles, CA
- Chicago vs Houston, TX
- Chicago vs Phoenix, AZ
- Chicago vs Philadelphia, PA
- Chicago vs San Antonio, TX
Los Altos vs another city
- Los Altos vs Los Altos Hills, CA
- Los Altos vs Mountain View, CA
- Los Altos vs Palo Alto, CA
- Los Altos vs Sunnyvale, CA
- Los Altos vs Cupertino, CA
- Los Altos vs Stanford, CA
- Los Altos vs New York, NY
- Los Altos vs Los Angeles, CA
- Los Altos vs Houston, TX
- Los Altos vs Phoenix, AZ
- Los Altos 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).