Monthly Humidity Averages for Maryland
The humidity averages for each month are listed below for Baltimore, Maryland. The tables give the daily averages along with highest and lowest relative humidity levels.
Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold.
All the numbers here are averages for the years 1961 to 1990.
Average Humidity
In this table, the Daily number for the month or year is the average of humidity readings taken every three hours throughout the day. Morning percentages are for 7 am and Afternoon measures are for 4 pm local standard time.
| Daily | Morning | Afternoon | |
|---|---|---|---|
| 63 | January | 70 | 54 |
| 61 | February | 70 | 52 |
| 59 | March | 71 | 47 |
| 59 | April | 71 | 46 |
| 66 | May | 77 | 52 |
| 68 | June | 79 | 53 |
| 69 | July | 81 | 53 |
| 71 | August | 83 | 55 |
| 71 | September | 84 | 54 |
| 70 | October | 82 | 53 |
| 67 | November | 77 | 54 |
| 66 | December | 73 | 56 |
| 66 | Annual | 76 | 52 |
Highest and Lowest Humidity
Below are the monthly and yearly averages for maximum and minimum humidity levels in Maryland. The hours when a month's highest and lowest humidity readings usually occur are given in local standard time.
| High | Time | Low | Time | |
|---|---|---|---|---|
| 70.0 | 7 am | January | 54.2 | 4 pm |
| 69.5 | 7 am | February | 51.6 | 4 pm |
| 70.5 | 7 am | March | 47.4 | 4 pm |
| 70.9 | 4 am | April | 46.2 | 4 pm |
| 80.1 | 4 am | May | 51.8 | 4 pm |
| 83.9 | 4 am | June | 52.5 | 1 pm |
| 84.0 | 4 am | July | 52.8 | 4 pm |
| 84.7 | 4 am | August | 54.6 | 4 pm |
| 84.6 | 4 am | September | 54.4 | 4 pm |
| 82.4 | 7 am | October | 52.7 | 4 pm |
| 77.1 | 7 am | November | 54.1 | 4 pm |
| 72.7 | 7 am | December | 56.1 | 4 pm |
| 76.9 | 4 am | Annual | 52.4 | 4 pm |
Reference
World Data Center for Meteorology. Climate of the World.