Monthly Humidity Averages for Oklahoma

The humidity averages for each month are listed below for places in Oklahoma. 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 6 am and Afternoon measures are for 3 pm local standard time.

Average relative humidity (%) for Oklahoma City, Oklahoma

Daily		Morning	Afternoon
67	January	77	51
66	February	77	51
61	March	75	46
61	April	77	45
68	May	83	51
67	June	84	51
61	July	80	44
62	August	80	43
67	September	83	49
64	October	79	46
67	November	79	50
68	December	78	52
65	Annual	79	48

Average relative humidity (%) for Tulsa, Oklahoma

Daily		Morning	Afternoon
67	January	78	52
65	February	77	51
62	March	76	47
61	April	78	46
69	May	85	54
69	June	86	54
64	July	82	47
65	August	84	46
70	September	87	52
66	October	82	47
67	November	80	51
69	December	79	53
66	Annual	81	50

Highest and Lowest Humidity

Below are the monthly and yearly averages for maximum and minimum humidity levels in Oklahoma. The hours when a month's highest and lowest humidity readings usually occur are given in local standard time.

Daily high and low relative humidity (%) averages in Oklahoma City, Oklahoma

High	Time		Low	Time
77.1	6 am	January	50.7	3 pm
77.3	6 am	February	50.5	3 pm
75.4	6 am	March	45.8	3 pm
76.5	6 am	April	45.2	3 pm
82.7	6 am	May	51.2	3 pm
83.5	6 am	June	50.7	3 pm
79.8	6 am	July	43.5	3 pm
80.1	6 am	August	43.4	3 pm
83.4	6 am	September	48.9	3 pm
78.9	6 am	October	46.0	3 pm
79.3	6 am	November	49.5	3 pm
77.6	6 am	December	51.8	3 pm
79.3	6 am	Annual	48.1	3 pm

Daily high and low relative humidity (%) averages in Tulsa, Oklahoma

High	Time		Low	Time
77.5	6 am	January	51.7	3 pm
77.0	6 am	February	50.5	3 pm
75.8	6 am	March	46.5	3 pm
77.5	6 am	April	45.8	3 pm
85.3	6 am	May	53.8	3 pm
85.6	6 am	June	53.7	3 pm
81.9	6 am	July	47.0	3 pm
83.6	6 am	August	46.4	3 pm
86.5	6 am	September	51.7	3 pm
82.4	6 am	October	47.0	3 pm
79.6	6 am	November	51.0	3 pm
78.9	6 am	December	53.3	3 pm
81.0	6 am	Annual	49.9	3 pm