NASA Surface meteorology and Solar Energy

**Monthly Averaged Radiation Incident On An Equator-Pointed Tilted Surface (kWh/m²/day)**
Lat 55.383 Lon 36.7	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
SSE HRZ	0.75	1.57	2.84	3.89	5.11	5.21	5.13	4.30	2.68	1.52	0.82	0.50	2.86
K	0.44	0.49	0.50	0.46	0.48	0.45	0.46	0.47	0.41	0.38	0.39	0.39	0.44
Diffuse	0.48	0.91	1.51	2.06	2.58	2.75	2.71	2.24	1.51	0.90	0.53	0.34	1.55
Direct	1.49	2.45	3.50	3.80	4.70	4.45	4.43	4.05	2.76	2.01	1.42	1.04	3.01
Tilt 0	0.75	1.56	2.81	3.87	5.13	5.27	5.15	4.26	2.63	1.49	0.81	0.50	2.86
Tilt 40	1.48	2.53	3.76	4.33	5.11	4.96	4.99	4.56	3.21	2.19	1.45	1.06	3.31
Tilt 55	1.63	2.68	3.80	4.14	4.69	4.50	4.52	4.29	3.15	2.26	1.56	1.18	3.20
Tilt 70	1.68	2.68	3.64	3.77	4.16	3.94	3.99	3.84	2.96	2.22	1.59	1.23	2.98
Tilt 90	1.61	2.47	3.16	3.05	3.19	2.98	3.03	3.04	2.49	2.00	1.50	1.19	2.48
OPT	1.69	2.70	3.81	4.35	5.33	5.33	5.28	4.63	3.21	2.26	1.59	1.23	3.46
OPT ANG	72.0	63.0	50.0	33.0	19.0	11.0	16.0	28.0	42.0	57.0	68.0	74.0	44.3

**Minimum Available Insolation Over A Consecutive-day Period (%)**
Lat 55.383 Lon 36.7	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Min/1 day	9.33	24.2	19.3	10.0	9.00	10.5	8.38	16.2	11.5	4.60	2.43	34.0
Min/3 day	42.6	38.8	41.4	26.5	25.3	28.7	16.1	24.8	28.9	17.1	33.7	55.3
Min/7 day	55.8	57.1	52.7	47.3	43.1	51.2	48.5	39.5	51.0	38.9	44.7	64.2
Min/14 day	64.0	67.7	69.3	53.3	64.4	72.9	71.7	60.4	54.4	42.8	50.4	73.5
Min/21 day	74.7	73.8	78.8	64.5	74.6	79.7	77.8	72.9	59.8	66.9	60.6	80.5
Min/Month	90.6	85.9	87.6	80.2	77.1	84.6	85.5	80.9	65.6	82.2	69.5	90.0

**Equivalent Number Of NO-SUN Or BLACK Days (days)**
Lat 55.383 Lon 36.7	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1 day	0.90	0.75	0.80	0.89	0.90	0.89	0.91	0.83	0.88	0.95	0.97	0.66
3 day	1.72	1.83	1.75	2.20	2.23	2.13	2.51	2.25	2.13	2.48	1.98	1.34
7 day	3.09	3.00	3.30	3.68	3.98	3.41	3.60	4.23	3.42	4.27	3.86	2.50
14 day	5.04	4.51	4.29	6.52	4.97	3.78	3.96	5.53	6.37	8.00	6.93	3.70
21 day	5.30	5.49	4.43	7.44	5.31	4.25	4.65	5.68	8.43	6.94	8.26	4.08
Month	2.89	3.92	3.82	5.93	7.09	4.60	4.47	5.91	10.2	5.50	9.14	3.10

**Available Surplus Insolation Over A Consecutive-day Period (%)**
Lat 55.383 Lon 36.7	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max/1 day	200	199	190	184	167	166	166	178	218	241	246	180
Max/3 day	192	190	175	177	164	160	159	174	206	221	212	166
Max/7 day	174	168	165	155	155	148	151	156	188	193	175	147
Max/14 day	144	141	147	144	129	133	132	140	145	152	160	142
Max/21 day	132	128	135	122	124	128	126	134	127	141	151	134
Max/Month	117	117	120	111	123	125	118	126	116	129	138	126

**Monthly Averaged Daylight Cloud Amount (%)**
Lat 55.383 Lon 36.7	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
22-year Average	61.6	62.6	61.9	66.9	62.8	64.5	60.6	60.5	67.8	70.7	64.1	57.8	63.5

**Monthly Averaged Wind Speed At 50 m Above The Surface Of The Earth (m/s)**
Lat 55.383 Lon 36.7	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
10-year Average	4.01	3.89	3.89	3.81	3.75	3.48	3.59	3.72	3.99	3.96	3.71	3.82	3.80

**Minimum And Maximum Difference From Monthly Averaged Wind Speed At 50 m (%)**
Lat 55.383 Lon 36.7	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
Minimum	-16	-12	-9	-10	-11	-12	-11	-9	-12	-22	-15	-11	-13
Maximum	13	18	21	9	15	11	10	10	10	13	21	14	14

It is recommended that users of these wind data review the SSE Methodology. The user may wish to correct for biases as well as local effects within the selected grid region.

All height measurements are from the soil, water, or ice/snow surface instead of "effective" surface, which is usually taken to be near the tops of vegetated canopies.

Difference Between The Average Wind Speed At 10 m Above The Surface Of The Earth And The Average Wind speed At 50 m Above The Surface Of The Earth (%)
***Vegetation type*** Rough bare soil
Lat 55.383 Lon 36.7	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
10-year Average	-30	-30	-30	-30	-30	-30	-30	-30	-30	-30	-30	-30	-30