Procedure I - Natural Cycles

MIL-STD-810H, Environmental Engineering Considerations and Laboratory Tests

Last Updated 29 Oct 2026

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3 tables appear under this heading.

1. PDF page 219

Time	Temp.		RH	Time	Temp.		RH
°C	°F	Percent	°C	Time	°F	Percent	RH
0100	Nearly constant at 24°C (75°F) throughout the 24 hours.		100	1300	Nearly constant at 24°C (75°F) throughout the 24 hours.		95
0200			100	1400			95
0300			100	1500			95
0400			100	1600			95
0500			100	1700			95
0600			100	1800			95
0700			98	1900			97
0800			97	2000			98
0900			95	2100			100
1000			95	2200			100
1100			95	2300			100
1200			95	2400			100

2. PDF page 220

Time	Temp.		RH	Time	Temp.		RH
Time	°C	°F	Percent	Time	°C	°F	Percent
0100	27	80	100	1300	34	94	74
0200	26	79	100	1400	35	95	74
0300	26	79	100	1500	35	95	74
0400	26	79	100	1600	34	94	76
0500	26	78	100	1700	33	92	79
0600	26	78	100	1800	32	90	82
0700	27	81	94	1900	31	88	86
0800	29	84	88	2000	29	85	91
0900	31	87	82	2100	28	83	95
1000	32	89	79	2200	28	82	96
1100	33	92	77	2300	27	81	100
1200	34	94	75	2400	27	80	100

3. PDF page 221

Time	Temp.		RH Percent	Time	Temp.		RH Percent
Time	°C	°F	RH Percent	Time	°C	°F	RH Percent
0100	31	88	88	1300	41	105	59
0200	31	88	88	1400	41	105	59
0300	31	88	88	1500	41	105	59
0400	31	88	88	1600	41	105	59
0500	31	88	88	1700	39	102	65
0600	32	90	85	1800	37	99	69
0700	34	93	80	1900	36	97	73
0800	36	96	76	2000	34	94	79
0900	37	98	73	2100	33	91	85
1000	38	100	69	2200	32	90	85
1100	39	102	65	2300	32	89	88
1200	40	104	62	2400	31	88	88