Northbrook weather in January
In January, Northbrook sees average daytime highs of 30°F and overnight lows near 21°F, with 2.9 in of precipitation across 9.8 wet days and about 9.3 hours of daylight. It is the 12th-warmest and 11th-wettest month of the year here.
Highs ease over the month, from about 33°F in the first days to 29°F by the end. The sky is clear or mostly clear about 17% of the time in January, and the air most often feels dry.
Daylight stretches from about 9 hours at the start of January to 9 h 42 min by month's end. Set against the rest of the year, January is Northbrook's 12th-clearest and 3rd-windiest month. For the whole year in context, see Northbrook's year-round climate.
- Daytime high
- 30°
- 12th warmest
- Overnight low
- 21°
- 2nd coldest
- Precipitation
- 2.9 in
- 9.8 wet days
- Daylight
- 9 h 12 min
- 7:23 AM – 4:38 PM
- Cloud cover
- 76%
- 12th clearest
- Wind
- 14 mph
- 3rd windiest
- Solar energy
- 1.83 kWh/m²
- Travel score
- 0.0
- out of 10
Northbrook is village in Illinois, United States.
- Density
- 977/km²
- people per km²
- Founded
- 1901
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in January
Highs ease over the month, from about 33°F in the first days to 29°F by the end.
A typical January day in Northbrook reaches about 30°F in the afternoon and slips back to 21°F overnight — a 9°F spread between the day's warmth and the night's chill. On most days the high lands between 18°F and 40°F. Set against its neighbours, January runs about 6°F cooler than December and on par with February.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
| Avg low (°F) | 25 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 21 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| 1 | 33 | 25 |
| 2 | 33 | 24 |
| 3 | 33 | 24 |
| 4 | 32 | 24 |
| 5 | 32 | 24 |
| 6 | 32 | 24 |
| 7 | 32 | 23 |
| 8 | 31 | 23 |
| 9 | 31 | 23 |
| 10 | 31 | 22 |
| 11 | 31 | 22 |
| 12 | 31 | 22 |
| 13 | 31 | 22 |
| 14 | 30 | 21 |
| 15 | 30 | 21 |
| 16 | 30 | 21 |
| 17 | 30 | 21 |
| 18 | 30 | 20 |
| 19 | 30 | 20 |
| 20 | 29 | 20 |
| 21 | 29 | 20 |
| 22 | 29 | 20 |
| 23 | 29 | 20 |
| 24 | 29 | 20 |
| 25 | 29 | 20 |
| 26 | 29 | 20 |
| 27 | 29 | 20 |
| 28 | 29 | 20 |
| 29 | 29 | 20 |
| 30 | 29 | 20 |
| 31 | 29 | 20 |
How January really feels in Northbrook
Once humidity and wind are folded in, January averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.
The story in January is cold — wind chill drags the overnight "feels like" below the raw low.
Northbrook weather by month
How January compares with the rest of the year at a glance. January is the 12th-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 30° / 21° | 2.9 | 9.8 | 7 | 9.3 | 0.0 |
| Feb | 31° / 21° | 2.4 | 7.7 | 5.1 | 10.3 | 0.0 |
| Mar | 37° / 29° | 3.0 | 9.8 | 3.2 | 11.6 | 0.0 |
| Apr | 46° / 39° | 4.8 | 12 | 1.4 | 13.1 | 1.3 |
| May | 58° / 50° | 4.1 | 11.7 | 0 | 14.4 | 4.1 |
| Jun | 71° / 64° | 3.5 | 10.5 | 0 | 15 | 6.5 |
| Jul | 78° / 70° | 3.1 | 10.5 | 0 | 14.8 | 6.8 |
| Aug | 77° / 70° | 3.8 | 10.7 | 0 | 13.7 | 7.0 |
| Sep | 71° / 63° | 3.3 | 9.5 | 0 | 12.3 | 6.8 |
| Oct | 58° / 51° | 4.0 | 10.5 | 0.1 | 10.8 | 4.4 |
| Nov | 46° / 39° | 3.4 | 10 | 1.3 | 9.6 | 1.2 |
| Dec | 36° / 28° | 3.1 | 10 | 4.9 | 9 | 0.0 |
Cloud cover in January
The sky is clear or mostly clear about 17% of the time in January, the cloudiest month of the year.
Beyond those clear spells, partly cloudy skies cover about 10% of January, with mostly cloudy or overcast conditions the remaining 73%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 23 | 23 | 23 | 23 | 22 | 22 | 23 | 23 | 23 | 24 | 24 | 24 | 25 | 26 | 27 | 28 | 28 | 29 | 30 | 30 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 32 | 33 | 33 |
| Cloudier (%) | 77 | 77 | 77 | 77 | 78 | 78 | 77 | 77 | 77 | 76 | 76 | 76 | 75 | 74 | 73 | 72 | 72 | 71 | 70 | 70 | 70 | 70 | 70 | 69 | 69 | 69 | 69 | 69 | 68 | 67 | 67 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 23 | 77 |
| 2 | 23 | 77 |
| 3 | 23 | 77 |
| 4 | 23 | 77 |
| 5 | 22 | 78 |
| 6 | 22 | 78 |
| 7 | 23 | 77 |
| 8 | 23 | 77 |
| 9 | 23 | 77 |
| 10 | 24 | 76 |
| 11 | 24 | 76 |
| 12 | 24 | 76 |
| 13 | 25 | 75 |
| 14 | 26 | 74 |
| 15 | 27 | 73 |
| 16 | 28 | 72 |
| 17 | 28 | 72 |
| 18 | 29 | 71 |
| 19 | 30 | 70 |
| 20 | 30 | 70 |
| 21 | 30 | 70 |
| 22 | 30 | 70 |
| 23 | 30 | 70 |
| 24 | 31 | 69 |
| 25 | 31 | 69 |
| 26 | 31 | 69 |
| 27 | 31 | 69 |
| 28 | 31 | 69 |
| 29 | 32 | 68 |
| 30 | 33 | 67 |
| 31 | 33 | 67 |
Chance of precipitation in January
Northbrook gets around 2.9 in of rain and snow over 9.8 wet days in January. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable precipitation averages around 31% and peaks near 34% on the wettest days, and about 7 days bring snow.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 33 | 33 | 33 | 34 | 34 | 34 | 34 | 34 | 34 | 33 | 33 | 33 | 32 | 32 | 32 | 32 | 31 | 31 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 28 | 27 | 27 |
| Snow chance (%) | 19 | 19 | 20 | 20 | 21 | 21 | 22 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 22 | 22 | 22 | 21 |
| Rain chance (%) | Snow chance (%) | |
|---|---|---|
| 1 | 33 | 19 |
| 2 | 33 | 19 |
| 3 | 33 | 20 |
| 4 | 34 | 20 |
| 5 | 34 | 21 |
| 6 | 34 | 21 |
| 7 | 34 | 22 |
| 8 | 34 | 22 |
| 9 | 34 | 22 |
| 10 | 33 | 22 |
| 11 | 33 | 22 |
| 12 | 33 | 22 |
| 13 | 32 | 23 |
| 14 | 32 | 23 |
| 15 | 32 | 23 |
| 16 | 32 | 23 |
| 17 | 31 | 23 |
| 18 | 31 | 23 |
| 19 | 30 | 23 |
| 20 | 30 | 23 |
| 21 | 30 | 23 |
| 22 | 29 | 23 |
| 23 | 29 | 23 |
| 24 | 29 | 23 |
| 25 | 29 | 23 |
| 26 | 28 | 23 |
| 27 | 28 | 23 |
| 28 | 28 | 22 |
| 29 | 28 | 22 |
| 30 | 27 | 22 |
| 31 | 27 | 21 |
Humidity in January
Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 |
| Dry (%) | |
|---|---|
| 1 | 100 |
| 2 | 100 |
| 3 | 100 |
| 4 | 100 |
| 5 | 100 |
| 6 | 100 |
| 7 | 100 |
| 8 | 100 |
| 9 | 100 |
| 10 | 100 |
| 11 | 100 |
| 12 | 100 |
| 13 | 100 |
| 14 | 100 |
| 15 | 100 |
| 16 | 100 |
| 17 | 100 |
| 18 | 100 |
| 19 | 100 |
| 20 | 100 |
| 21 | 100 |
| 22 | 100 |
| 23 | 100 |
| 24 | 100 |
| 25 | 100 |
| 26 | 100 |
| 27 | 100 |
| 28 | 100 |
| 29 | 100 |
| 30 | 100 |
| 31 | 100 |
Wind in January
Winds average 14 mph in January.
Across January, daily wind ranges from about 13 mph on the calmest days to 15 mph at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 13 |
| Feels | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy | breezy |
| Wind speed (mph) | Feels | |
|---|---|---|
| 1 | 15 | breezy |
| 2 | 15 | breezy |
| 3 | 15 | breezy |
| 4 | 15 | breezy |
| 5 | 15 | breezy |
| 6 | 15 | breezy |
| 7 | 15 | breezy |
| 8 | 15 | breezy |
| 9 | 15 | breezy |
| 10 | 15 | breezy |
| 11 | 15 | breezy |
| 12 | 14 | breezy |
| 13 | 14 | breezy |
| 14 | 14 | breezy |
| 15 | 14 | breezy |
| 16 | 14 | breezy |
| 17 | 14 | breezy |
| 18 | 14 | breezy |
| 19 | 14 | breezy |
| 20 | 14 | breezy |
| 21 | 14 | breezy |
| 22 | 14 | breezy |
| 23 | 14 | breezy |
| 24 | 14 | breezy |
| 25 | 14 | breezy |
| 26 | 13 | breezy |
| 27 | 13 | breezy |
| 28 | 13 | breezy |
| 29 | 13 | breezy |
| 30 | 13 | breezy |
| 31 | 13 | breezy |
Sunrise & sunset in January
Daylight runs from about 9 hours at the start of January to 9 h 42 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 42 minutes over January. Sunrise moves from 7:25 AM to 7:13 AM, and sunset from 4:24 PM to 4:56 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 9.0 | 9.0 | 9.0 | 9.0 | 9.0 | 9.0 | 9.1 | 9.1 | 9.1 | 9.1 | 9.1 | 9.2 | 9.2 | 9.2 | 9.2 | 9.2 | 9.3 | 9.3 | 9.3 | 9.4 | 9.4 | 9.4 | 9.4 | 9.5 | 9.5 | 9.5 | 9.6 | 9.6 | 9.6 | 9.7 | 9.7 |
| Sunrise (AM) | 7:25 | 7:25 | 7:25 | 7:25 | 7:25 | 7:25 | 7:25 | 7:25 | 7:25 | 7:25 | 7:25 | 7:25 | 7:24 | 7:24 | 7:24 | 7:23 | 7:23 | 7:22 | 7:22 | 7:21 | 7:21 | 7:20 | 7:20 | 7:19 | 7:18 | 7:18 | 7:17 | 7:16 | 7:15 | 7:14 | 7:13 |
| Sunset (PM) | 4:24 | 4:25 | 4:25 | 4:26 | 4:27 | 4:28 | 4:29 | 4:30 | 4:31 | 4:32 | 4:33 | 4:34 | 4:35 | 4:36 | 4:37 | 4:38 | 4:39 | 4:40 | 4:41 | 4:43 | 4:44 | 4:45 | 4:46 | 4:47 | 4:48 | 4:50 | 4:51 | 4:52 | 4:53 | 4:55 | 4:56 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 9.0 | 7:25 | 4:24 |
| 2 | 9.0 | 7:25 | 4:25 |
| 3 | 9.0 | 7:25 | 4:25 |
| 4 | 9.0 | 7:25 | 4:26 |
| 5 | 9.0 | 7:25 | 4:27 |
| 6 | 9.0 | 7:25 | 4:28 |
| 7 | 9.1 | 7:25 | 4:29 |
| 8 | 9.1 | 7:25 | 4:30 |
| 9 | 9.1 | 7:25 | 4:31 |
| 10 | 9.1 | 7:25 | 4:32 |
| 11 | 9.1 | 7:25 | 4:33 |
| 12 | 9.2 | 7:25 | 4:34 |
| 13 | 9.2 | 7:24 | 4:35 |
| 14 | 9.2 | 7:24 | 4:36 |
| 15 | 9.2 | 7:24 | 4:37 |
| 16 | 9.2 | 7:23 | 4:38 |
| 17 | 9.3 | 7:23 | 4:39 |
| 18 | 9.3 | 7:22 | 4:40 |
| 19 | 9.3 | 7:22 | 4:41 |
| 20 | 9.4 | 7:21 | 4:43 |
| 21 | 9.4 | 7:21 | 4:44 |
| 22 | 9.4 | 7:20 | 4:45 |
| 23 | 9.4 | 7:20 | 4:46 |
| 24 | 9.5 | 7:19 | 4:47 |
| 25 | 9.5 | 7:18 | 4:48 |
| 26 | 9.5 | 7:18 | 4:50 |
| 27 | 9.6 | 7:17 | 4:51 |
| 28 | 9.6 | 7:16 | 4:52 |
| 29 | 9.6 | 7:15 | 4:53 |
| 30 | 9.7 | 7:14 | 4:55 |
| 31 | 9.7 | 7:13 | 4:56 |
Solar energy in January
Average shortwave solar energy reaching the ground each day in January, about 1.83 kWh/m².
For context, solar energy here swings from a low near 1.48 kWh/m² to a high of 6.5 kWh/m² in June across the year — January's 1.83 kWh/m² sits near the bottom.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 1.5 | 1.5 | 1.5 | 1.5 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.7 | 1.7 | 1.7 | 1.8 | 1.8 | 1.8 | 1.9 | 1.9 | 1.9 | 1.9 | 2.0 | 2.0 | 2.1 | 2.1 | 2.1 | 2.2 | 2.2 | 2.3 | 2.3 | 2.3 | 2.4 |
| Level | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Dim | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 1.5 | Dim |
| 2 | 1.5 | Dim |
| 3 | 1.5 | Dim |
| 4 | 1.5 | Dim |
| 5 | 1.6 | Dim |
| 6 | 1.6 | Dim |
| 7 | 1.6 | Dim |
| 8 | 1.6 | Dim |
| 9 | 1.6 | Dim |
| 10 | 1.6 | Dim |
| 11 | 1.7 | Dim |
| 12 | 1.7 | Dim |
| 13 | 1.7 | Dim |
| 14 | 1.8 | Dim |
| 15 | 1.8 | Dim |
| 16 | 1.8 | Dim |
| 17 | 1.9 | Dim |
| 18 | 1.9 | Dim |
| 19 | 1.9 | Dim |
| 20 | 1.9 | Dim |
| 21 | 2.0 | Dim |
| 22 | 2.0 | Moderate |
| 23 | 2.1 | Moderate |
| 24 | 2.1 | Moderate |
| 25 | 2.1 | Moderate |
| 26 | 2.2 | Moderate |
| 27 | 2.2 | Moderate |
| 28 | 2.3 | Moderate |
| 29 | 2.3 | Moderate |
| 30 | 2.3 | Moderate |
| 31 | 2.4 | Moderate |
Is January a good time to visit Northbrook?
Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
January is a weaker month for outdoor sightseeing in Northbrook.
What to pack for Northbrook in January
From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In January, Northbrook sees daytime highs around 30°F and nights near 21°F. Pack a warm layer and a heavy coat. Worth having: rain gear and a windbreaker. About 10 days see rain.
Sea temperature near Northbrook in January
The nearest coast averages about 38°F in January — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 11 mi away) is warmest in August at about 72°F and coldest in February near 36°F.
It's comfortable for a long swim from Jul 14 to Sep 14 — about 2.1 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 38 | 36 | 36 | 39 | 44 | 56 | 69 | 72 | 68 | 58 | 48 | 42 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Bracing | Refreshing | Refreshing | Refreshing | Bracing | Bracing | Bracing |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 38 | Bracing |
| Feb | 36 | Bracing |
| Mar | 36 | Bracing |
| Apr | 39 | Bracing |
| May | 44 | Bracing |
| Jun | 56 | Bracing |
| Jul | 69 | Refreshing |
| Aug | 72 | Refreshing |
| Sep | 68 | Refreshing |
| Oct | 58 | Bracing |
| Nov | 48 | Bracing |
| Dec | 42 | Bracing |
UV index in Northbrook in January
Clear-sky midday UV in January peaks around 2. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Northbrook peaks around June 23 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 4 | 6 | 7 | 9 | 9 | 8 | 6 | 3 | 2 | 2 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 7 | Very high |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 2 | Moderate |
| Dec | 2 | Low |
Air quality in Northbrook in January
Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.
Air quality in Northbrook is worst in July — around 21 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (October, 10 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 12 | 15 | 18 | 19 | 20 | 21 | 21 | 18 | 15 | 10 | 10 | 11 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 12 | Moderate |
| Feb | 15 | Moderate |
| Mar | 18 | Moderate |
| Apr | 19 | Moderate |
| May | 20 | Moderate |
| Jun | 21 | Moderate |
| Jul | 21 | Moderate |
| Aug | 18 | Moderate |
| Sep | 15 | Moderate |
| Oct | 10 | Good |
| Nov | 10 | Good |
| Dec | 11 | Good |
Where is Northbrook?
Northbrook sits at 42.1°N, 87.8°W, 646 ft above sea level, in United States. The nearest listed city is Deerfield, 3.1 mi away.
Topography around Northbrook
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Northbrook.
Within 2 miles, the terrain around Northbrook has only modest variations in elevation — a maximum elevation change of 135 ft around an average of 673 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 240 ft; within 50 miles, significant variations in elevation — a maximum elevation change of 892 ft.
The land around Northbrook is covered by trees (46%) and artificial surfaces (35%) within 2 miles, trees (35%), artificial surfaces (29%) and water (25%) within 10 miles, and water (40%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Northbrook (42.1275°, -87.829°, elevation 646 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).