Herndon, Virginia Weather Forecast

Local

Herndon, VA, US

38.96955, -77.3861

Normals for December

	Temp ( °F °C )			Precip ( " mm )		Degree Days
	Min	Max	Avg	MTD	YTD	Heating	Cooling
1	32 0	51 10	41 5	0.11 undefined	40.05 undefined	23.7	0
2	32 0	50 10	41 5	0.22 undefined	40.16 undefined	24	0
3	31 0	50 10	41 5	0.34 undefined	40.28 undefined	24.3	0
4	31 0	50 10	40 5	0.45 undefined	40.39 undefined	24.6	0
5	31 -1	49 10	40 5	0.57 undefined	40.51 undefined	24.8	0
6	31 -1	49 10	40 4	0.69 undefined	40.63 undefined	25.1	0
7	31 -1	49 9	40 4	0.8 undefined	40.74 undefined	25.3	0
8	30 -1	48 9	39 4	0.91 undefined	40.85 undefined	25.6	0
9	30 -1	48 9	39 4	1.03 undefined	40.97 undefined	25.8	0
10	30 -1	48 9	39 4	1.14 undefined	41.08 undefined	26.1	0
11	30 -1	48 9	39 4	1.26 undefined	41.2 undefined	26.3	0
12	30 -1	47 9	38 4	1.37 undefined	41.31 undefined	26.6	0
13	29 -1	47 8	38 3	1.48 undefined	41.42 undefined	26.8	0
14	29 -2	47 8	38 3	1.59 undefined	41.53 undefined	27	0
15	29 -2	47 8	38 3	1.7 undefined	41.64 undefined	27.2	0
16	29 -2	46 8	38 3	1.81 undefined	41.75 undefined	27.4	0
17	29 -2	46 8	37 3	1.91 undefined	41.85 undefined	27.7	0
18	29 -2	46 8	37 3	2.02 undefined	41.96 undefined	27.9	0
19	28 -2	46 8	37 3	2.12 undefined	42.06 undefined	28.1	0
20	28 -2	45 7	37 3	2.23 undefined	42.17 undefined	28.3	0
21	28 -2	45 7	37 3	2.33 undefined	42.27 undefined	28.4	0
22	28 -2	45 7	36 2	2.43 undefined	42.37 undefined	28.6	0
23	28 -2	45 7	36 2	2.54 undefined	42.48 undefined	28.8	0
24	28 -2	45 7	36 2	2.64 undefined	42.58 undefined	29	0
25	27 -3	44 7	36 2	2.74 undefined	42.68 undefined	29.1	0
26	27 -3	44 7	36 2	2.83 undefined	42.77 undefined	29.3	0
27	27 -3	44 7	36 2	2.93 undefined	42.87 undefined	29.5	0
28	27 -3	44 7	35 2	3.03 undefined	42.97 undefined	29.6	0
29	27 -3	44 6	35 2	3.12 undefined	43.06 undefined	29.8	0
30	27 -3	44 6	35 2	3.21 undefined	43.15 undefined	29.9	0
31	27 -3	43 6	35 2	3.3 undefined	43.24 undefined	30	0