NASA Surface meteorology and Solar Energy

**Monthly Averaged Radiation Incident On An Equator-Pointed Tilted Surface (kWh/m²/day)**
Lat 56 Lon 40	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
SSE HRZ	0.63	1.43	2.70	3.89	5.27	5.53	5.43	4.28	2.69	1.47	0.75	0.41	2.88
K	0.41	0.47	0.49	0.47	0.50	0.48	0.49	0.47	0.42	0.38	0.39	0.36	0.44
Diffuse	0.42	0.84	1.46	2.04	2.58	2.76	2.63	2.23	1.50	0.87	0.49	0.29	1.51
Direct	1.24	2.24	3.31	3.89	5.06	5.06	5.16	4.08	2.86	1.98	1.33	0.84	3.09
Tilt 0	0.63	1.42	2.67	3.87	5.29	5.60	5.44	4.28	2.64	1.44	0.74	0.41	2.88
Tilt 41	1.26	2.33	3.59	4.36	5.28	5.26	5.29	4.55	3.25	2.14	1.36	0.88	3.30
Tilt 56	1.38	2.46	3.62	4.16	4.84	4.75	4.79	4.28	3.20	2.22	1.46	0.97	3.18
Tilt 71	1.43	2.45	3.46	3.78	4.28	4.15	4.20	3.84	3.00	2.18	1.49	1.01	2.94
Tilt 90	1.37	2.27	3.02	3.10	3.33	3.17	3.22	3.08	2.55	1.97	1.41	0.98	2.46
OPT	1.43	2.47	3.63	4.38	5.52	5.67	5.61	4.62	3.26	2.22	1.49	1.01	3.45
OPT ANG	72.0	63.0	50.0	34.0	20.0	11.0	17.0	27.0	43.0	58.0	69.0	74.0	44.7

**Minimum Available Insolation Over A Consecutive-day Period (%)**
Lat 56 Lon 40	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Min/1 day	4.76	7.69	7.40	4.88	9.48	6.87	15.8	4.90	6.69	3.40	2.66	53.6
Min/3 day	47.6	29.3	34.1	33.4	22.0	18.1	18.4	18.3	26.3	30.1	22.2	58.5
Min/7 day	57.3	53.1	56.0	41.8	52.3	41.9	40.2	51.2	42.2	46.3	49.9	63.0
Min/14 day	69.5	68.6	67.2	54.4	68.7	58.2	71.8	63.8	53.6	49.9	63.6	67.0
Min/21 day	78.0	76.2	71.4	67.9	73.3	66.4	73.2	73.3	65.6	60.9	69.1	77.8
Min/Month	88.8	83.9	79.6	86.6	77.7	72.8	84.7	86.4	69.5	82.3	73.3	87.8

**Equivalent Number Of NO-SUN Or BLACK Days (days)**
Lat 56 Lon 40	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1 day	0.95	0.92	0.92	0.95	0.90	0.93	0.84	0.95	0.93	0.96	0.97	0.46
3 day	1.57	2.11	1.97	1.99	2.33	2.45	2.44	2.45	2.20	2.09	2.33	1.24
7 day	2.98	3.27	3.07	4.07	3.33	4.06	4.18	3.41	4.04	3.75	3.50	2.58
14 day	4.26	4.39	4.58	6.37	4.37	5.84	3.94	5.06	6.49	7.01	5.09	4.60
21 day	4.61	4.97	5.99	6.73	5.59	7.04	5.62	5.59	7.21	8.19	6.47	4.65
Month	3.44	4.50	6.31	4.01	6.88	8.13	4.73	4.20	9.14	5.48	8.00	3.78

**Monthly Averaged Wind Speed At 10 m Above The Surface Of The Earth For Terrain Similar To Airports (m/s)**
Lat 56 Lon 40	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Annual Average
10-year Average	2.92	3.00	3.03	3.03	2.97	2.76	2.71	2.96	3.14	3.01	2.85	2.88	2.93

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.