NASA Surface meteorology and Solar Energy

**Monthly Averaged Radiation Incident On An Equator-Pointed Tilted Surface (kWh/m²/day)**
Lat 51.28 Lon 37.55	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
SSE HRZ	1.07	1.96	3.09	3.85	5.19	5.27	5.25	4.53	3.06	1.85	1.06	0.78	3.08
K	0.45	0.50	0.49	0.44	0.48	0.45	0.47	0.48	0.43	0.40	0.38	0.41	0.45
Diffuse	0.66	1.06	1.60	2.10	2.54	2.75	2.63	2.24	1.61	1.02	0.66	0.50	1.62
Direct	1.82	2.83	3.52	3.37	4.65	4.29	4.51	4.21	3.12	2.35	1.58	1.36	3.14
Tilt 0	1.05	1.94	3.06	3.83	5.21	5.29	5.27	4.50	3.01	1.81	1.02	0.78	3.07
Tilt 36	1.79	2.91	3.88	4.16	5.16	5.03	5.10	4.75	3.57	2.51	1.61	1.37	3.49
Tilt 51	1.95	3.07	3.92	3.98	4.76	4.55	4.65	4.49	3.53	2.60	1.73	1.51	3.40
Tilt 66	2.01	3.08	3.76	3.63	4.17	3.99	4.10	4.03	3.32	2.57	1.76	1.57	3.17
Tilt 90	1.88	2.76	3.14	2.79	3.04	2.83	2.92	3.00	2.68	2.24	1.62	1.48	2.53
OPT	2.01	3.10	3.93	4.18	5.36	5.36	5.37	4.81	3.58	2.61	1.77	1.57	3.64
OPT ANG	67.0	59.0	46.0	29.0	17.0	11.0	14.0	25.0	40.0	54.0	63.0	69.0	41.0

**Minimum Available Insolation Over A Consecutive-day Period (%)**
Lat 51.28 Lon 37.55	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Min/1 day	3.73	30.6	28.1	27.7	21.3	9.29	12.1	26.2	16.6	7.56	5.66	10.2
Min/3 day	26.7	50.3	34.4	37.3	33.5	37.2	36.2	35.6	22.3	29.9	27.3	35.0
Min/7 day	35.3	62.6	36.2	50.5	45.0	58.4	59.7	64.3	37.3	41.5	37.7	49.2
Min/14 day	60.8	71.5	59.4	65.7	69.1	70.1	65.6	71.2	57.9	53.5	50.7	58.6
Min/21 day	69.2	74.6	67.6	71.6	77.5	75.2	71.3	75.1	68.1	67.1	57.7	65.7
Min/Month	91.5	74.4	81.2	86.7	81.3	87.0	81.3	82.1	82.0	82.7	70.7	74.3

**Equivalent Number Of NO-SUN Or BLACK Days (days)**
Lat 51.28 Lon 37.55	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1 day	0.96	0.69	0.71	0.72	0.78	0.90	0.87	0.73	0.83	0.92	0.94	0.89
3 day	2.19	1.48	1.96	1.88	1.99	1.88	1.91	1.93	2.33	2.10	2.17	1.94
7 day	4.52	2.61	4.46	3.45	3.84	2.91	2.81	2.49	4.38	4.09	4.35	3.55
14 day	5.48	3.98	5.67	4.79	4.31	4.18	4.81	4.02	5.88	6.49	6.89	5.79
21 day	6.46	5.32	6.79	5.95	4.71	5.19	6.00	5.22	6.69	6.90	8.86	7.19
Month	2.60	7.14	5.81	3.97	5.79	3.87	5.78	5.54	5.39	5.36	8.77	7.94

**Monthly Averaged Wind Speed At 50 m Above The Surface Of The Earth (m/s)**
Lat 51.28 Lon 37.55	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
10-year Average	4.71	4.57	4.40	4.24	4.16	3.86	3.93	4.15	4.46	4.55	4.26	4.47	4.31

**Minimum And Maximum Difference From Monthly Averaged Wind Speed At 50 m (%)**
Lat 51.28 Lon 37.55	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
Minimum	-16	-14	-14	-8	-14	-19	-18	-9	-7	-14	-14	-8	-13
Maximum	14	21	18	10	16	14	13	10	12	11	21	13	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 51.28 Lon 37.55	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