NASA Surface meteorology and Solar Energy

**Monthly Averaged Radiation Incident On An Equator-Pointed Tilted Surface (kWh/m²/day)**
Lat 60 Lon 30	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
SSE HRZ	0.35	1.06	2.35	3.91	5.40	5.84	5.61	4.38	2.63	1.24	0.49	0.20	2.79
K	0.37	0.45	0.48	0.50	0.52	0.51	0.52	0.50	0.45	0.39	0.38	0.34	0.45
Diffuse	0.25	0.66	1.32	1.97	2.49	2.78	2.63	2.20	1.43	0.77	0.34	0.14	1.42
Direct	0.85	1.84	3.10	4.43	5.87	6.04	5.93	4.68	3.17	1.84	1.05	0.56	3.29
Tilt 0	0.33	1.06	2.33	3.88	5.46	5.90	5.68	4.40	2.58	1.22	0.49	0.20	2.80
Tilt 45	0.79	1.91	3.30	4.56	5.47	5.53	5.48	4.78	3.38	1.97	1.08	0.55	3.24
Tilt 60	0.87	2.02	3.32	4.35	5.03	4.99	4.98	4.48	3.33	2.04	1.18	0.61	3.10
Tilt 75	0.90	2.02	3.17	3.94	4.43	4.34	4.36	4.02	3.12	2.00	1.20	0.64	2.85
Tilt 90	0.87	1.91	2.87	3.39	3.66	3.53	3.56	3.40	2.76	1.86	1.17	0.63	2.47
OPT	0.90	2.03	3.33	4.58	5.75	6.02	5.84	4.86	3.38	2.04	1.20	0.64	3.39
OPT ANG	76.0	67.0	54.0	38.0	24.0	14.0	17.0	31.0	48.0	62.0	74.0	79.0	48.5

**Minimum Available Insolation Over A Consecutive-day Period (%)**
Lat 60 Lon 30	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Min/1 day	5.71	1.88	11.4	4.34	3.88	4.28	15.6	4.10	3.42	3.22	14.2	55.0
Min/3 day	41.9	29.2	24.2	38.5	37.7	34.0	25.6	24.2	23.3	20.9	39.4	58.3
Min/7 day	51.0	48.1	49.7	62.0	54.1	56.7	51.0	48.1	40.9	28.3	52.1	63.5
Min/14 day	61.6	61.6	63.6	72.1	57.9	71.2	73.3	65.4	58.4	52.1	61.3	67.8
Min/21 day	71.1	69.8	69.0	80.3	70.6	75.8	81.5	72.6	61.6	68.1	71.3	76.1
Min/Month	88.5	79.2	76.5	83.6	78.7	80.6	87.3	79.6	78.7	86.2	87.7	90.0

**Equivalent Number Of NO-SUN Or BLACK Days (days)**
Lat 60 Lon 30	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1 day	0.94	0.98	0.88	0.95	0.96	0.95	0.84	0.95	0.96	0.96	0.85	0.45
3 day	1.74	2.12	2.27	1.84	1.86	1.97	2.22	2.27	2.30	2.37	1.81	1.25
7 day	3.42	3.63	3.51	2.65	3.20	3.02	3.42	3.62	4.13	5.01	3.34	2.54
14 day	5.37	5.36	5.08	3.90	5.88	4.02	3.72	4.84	5.81	6.69	5.40	4.50
21 day	6.05	6.33	6.49	4.13	6.15	5.06	3.88	5.75	8.04	6.69	6.02	4.99
Month	3.54	5.81	7.25	4.91	6.60	5.80	3.92	6.29	6.38	4.24	3.67	3.10

**Available Surplus Insolation Over A Consecutive-day Period (%)**
Lat 60 Lon 30	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max/1 day	260	225	194	174	156	148	152	165	200	240	263	190
Max/3 day	208	197	185	166	154	144	145	161	195	223	240	173
Max/7 day	179	176	167	150	148	140	141	153	168	195	180	144
Max/14 day	155	151	145	139	126	130	129	135	141	156	162	126
Max/21 day	135	134	132	129	121	127	122	129	128	135	141	113
Max/Month	114	123	114	115	115	119	115	123	118	113	118	105

**Monthly Averaged Cloud Amount At Indicated GMT Times (%)**
Lat 60 Lon 30	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Average@00	n/a	n/a	n/a	n/a	50.3	53.0	47.9	n/a	n/a	n/a	n/a	n/a
Average@03	n/a	n/a	51.8	52.0	49.4	54.0	47.0	54.8	59.2	50.8	n/a	n/a
Average@06	63.2	61.9	55.3	58.2	53.8	54.6	50.7	54.6	60.1	62.0	65.0	65.4
Average@09	60.9	58.9	58.0	62.9	58.0	57.8	56.4	58.2	65.8	70.0	63.9	61.1
Average@12	61.5	57.6	62.2	68.3	64.5	63.4	59.6	58.7	66.8	69.6	61.4	62.0
Average@15	58.4	57.3	54.9	60.5	63.1	63.0	57.7	56.9	61.6	65.0	56.1	n/a
Average@18	n/a	n/a	27.9	57.3	61.1	59.6	55.0	54.4	52.1	n/a	n/a	n/a
Average@21	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a	n/a

**Monthly Averaged Wind Speed At 10 m Above The Surface Of The Earth For Terrain Similar To Airports (m/s)**
Lat 60 Lon 30	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
10-year Average	2.96	2.95	2.95	2.94	2.95	2.91	2.83	2.95	3.07	3.07	2.95	2.91	2.95

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.

Monthly Averaged Wind Speed At 50, 100, 150 and 300 m Above The Surface Of The Earth (m/s)
***Vegetation type*** "Airport": flat rough grass
Lat 60 Lon 30	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
50m	3.75	3.74	3.73	3.72	3.74	3.68	3.58	3.73	3.89	3.88	3.73	3.68	3.73
100m	4.16	4.14	4.13	4.12	4.14	4.08	3.97	4.13	4.31	4.30	4.13	4.08	4.14
150m	4.42	4.41	4.39	4.38	4.41	4.33	4.22	4.39	4.58	4.57	4.39	4.33	4.40
300m	4.90	4.89	4.88	4.86	4.89	4.81	4.68	4.88	5.08	5.07	4.88	4.81	4.88