NWS Little Rock, AR - Heat Index and Wind Chill Charts

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To monitor wind chill and heat index values, look at the charts below.

	Wind Chill & Heat Index Charts

WIND CHILL INDEX °F
	WIND SPEED (MPH)
TEMP (°F)	5	10	15	20	25	30	35	40
-25	-40	-47	-51	-55	-58	-60	-62	-64
-20	-34	-41	-45	-48	-51	-53	-55	-57
-15	-28	-35	-39	-42	-44	-46	-48	-50
-10	-22	-28	-32	-35	-37	-39	-41	-43
-5	-16	-22	-26	-29	-31	-33	-34	-36
0	-11	-16	-19	-22	-24	-26	-27	-29
5	-5	-10	-13	-15	-17	-19	-21	-22
10	1	-4	-7	-9	-11	-12	-14	-15
15	7	3	0	-2	-4	-5	-7	-8
20	13	9	6	4	3	1	0	-1
25	19	15	13	11	9	8	7	6
30	25	21	19	17	16	15	14	13
35	31	27	25	24	23	22	21	20

A Wind Chill Index Chart is shown above. For an image, click here.

When temperatures and/or wind chill index values (with a wind speed of at least 10 mph) reach 0 degrees for several hours over a fairly large area, the National Weather Service will usually issue a Cold Weather Advisory.

When temperatures and/or wind chill index values (with a wind speed of at least 10 mph) reach -15 degrees for one hour over a fairly large area, an Extreme Cold Warning may be posted.

Under these conditions, people are advised to protect themselves from the cold, and cover exposed skin with several layers of clothing.

HEAT INDEX °F
	RELATIVE HUMIDITY (%)
TEMP (°F)	40	45	50	55	60	65	70	75	80	85	90	95	100
110	136
108	130	137
106	124	130	137
104	119	124	131	137
102	114	119	124	130	137
100	109	114	118	124	129	136
98	105	109	113	117	123	128	134
96	101	104	108	112	116	121	126	132
94	97	100	103	106	110	114	119	124	129	135
92	94	96	99	101	105	108	112	116	121	126	131
90	91	93	95	97	100	103	106	109	113	117	122	127	132
88	88	89	91	93	95	98	100	103	106	110	113	117	121
86	85	87	88	89	91	93	95	97	100	102	105	108	112
84	83	84	85	86	88	89	90	92	94	96	98	100	103
82	81	82	83	84	84	85	86	88	89	90	91	93	95
80	80	80	81	81	82	82	83	84	84	85	86	86	87

A Heat Index Chart is shown above. For an image, click here.

The National Weather Service in Little Rock considers values over 105 degrees Fahrenheit (and/or temperatures over 103 degrees) to be excessively hot, and will usually issue a Heat Advisory. Under these conditions, people engaged in outdoor activities are advised to drink plenty of cool non-alcoholic beverages, and should take frequent breaks in an air-conditioned environment.

When heat index values reach 110 degrees (and/or temperatures are 105 degrees or greater), an Excessive Heat Warning may be posted.

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https://www.weather.gov/lzk/charts.htm