Below is the EMC table and chart.

From the US Dept. of Agriculture Wood Handbook, “Wood as an Engineering Material”
Humidity recommendations range from 30% – 50% in a building.
Temperature recommendations range from 60°F – 80°F in a building.
If ambient conditions stay within these recommendations, the moisture content of wood stays between 6% and 9%
and the amount of expansion and contraction of wood is limited.

Examples: (1) Conditions in a warehouse are 60% relative humidity at 50°F.
Dry wood is left in the warehouse for an extended period of time.
The wood will pick up moisture until 11.2% MC is reached, regardless of wood species and initial moisture content.
(2) Lumber at 7.7% will not change its moisture content if kept at 40% relative humidity and 70°F.
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	Relative Humidity EMC Table
T °F	5	10	15	20	25	30	35	40	45	50	55	60	65	70	75	80	85	90	95
30	1.4	2.6	3.7	4.6	5.5	6.3	7.1	7.8	8.7	9.5	10.4	11.3	12.4	13.5	14.9	16.5	18.5	21.0	24.3
40	1.4	2.6	3.7	4.6	5.5	6.3	7.1	7.8	8.7	9.5	10.4	11.3	12.4	13.5	14.9	16.5	18.5	21.0	24.3
50	1.4	2.6	3.6	4.6	5.5	6.3	7.1	7.9	8.7	9.5	10.3	11.2	12.3	13.4	14.8	16.4	18.4	20.9	24.3
60	1.3	2.5	3.6	4.6	5.4	6.2	7.0	7.8	8.6	9.4	10.2	11.1	12.1	13.3	14.6	16.2	18.2	20.7	24.1
70	1.3	2.5	3.5	4.5	5.4	6.2	6.9	7.7	8.5	9.2	10.1	11.0	12.0	13.1	14.4	16.0	17.9	20.5	23.9
80	1.3	2.4	3.5	4.4	5.3	6.1	6.8	7.6	8.3	9.1	9.6	10.8	11.7	12.9	14.2	15.7	17.7	20.2	23.6
90	1.2	2.3	3.4	4.3	5.1	5.9	6.7	7.4	8.1	8.9	9.7	10.5	11.5	12.6	13.9	15.4	17.3	19.8	23.3
100	1.2	2.3	3.3	4.2	5.0	5.8	6.5	7.2	7.9	8.7	9.5	10.3	11.2	12.3	13.6	15.1	17.0	19.5	22.9