Mother Neff State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mother Neff State Park clear sky chart from 2005-11-06 to 2024-11-05.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	11% 5% 2 5% 4 4 4 3 5% 7% 50%	101070
	Night	11% 5% 2 4 3 3 3 3 5% 7% 54%	98085
Transparency	Day	32% 5% 10% 22% 21% 9%	104852
	Night	30% 5% 10% 21% 22% 12%	102430
Seeing	Day	12% 6% 22% 29% 23% 7%	14984
	Night	13% 7% 27% 35% 16% 2	24851

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	12% 8% 2 5% 2 3 2 2 5% 5% 53%	2847
	11th to 20th	Day	15% 5% 1 3 2 2 2 2 4 6% 58%	2850
	21st to end	Day	19% 8% 3 6% 3 2 3 2 3 5% 46%	3176
February	1st to 10th	Day	18% 7% 2 6% 3 2 2 3 3 6% 48%	1900
	11th to 20th	Day	16% 8% 3 5% 3 3 3 3 3 5% 47%	1849
	21st to end	Day	18% 7% 2 5% 3 3 3 2 3 5% 50%	1574
March	1st to 10th	Day	16% 7% 2 7% 4 4 4 3 5% 5% 43%	3436
	11th to 20th	Day	19% 6% 2 7% 5% 5% 5% 4 4 6% 36%	3480
	21st to end	Day	12% 7% 2 7% 4 4 4 4 6% 6% 44%	3814
April	1st to 10th	Day	13% 8% 3 5% 4 3 3 3 6% 7% 43%	2090
	11th to 20th	Day	15% 7% 2 7% 4 4 3 4 4 7% 43%	2094
	21st to end	Day	14% 5% 2 5% 4 4 4 3 4 5% 49%	2431
May	1st to 10th	Day	20% 8% 3 7% 4 4 4 4 6% 6% 34%	4082
	11th to 20th	Day	15% 6% 2 6% 4 3 3 4 4 6% 46%	4082
	21st to end	Day	12% 6% 3 7% 5% 5% 6% 5% 8% 10% 34%	4477
June	1st to 10th	Day	5% 4 2 5% 4 5% 4 4 6% 8% 53%	2470
	11th to 20th	Day	6% 3 1 5% 5% 4 5% 3 6% 9% 52%	2470
	21st to end	Day	6% 4 2 4 5% 5% 5% 5% 7% 9% 48%	2470
July	1st to 10th	Day	5% 4 2 5% 4 5% 4 4 6% 8% 53%	4120
	11th to 20th	Day	4 2 1 3 3 3 4 4 6% 11% 59%	4120
	21st to end	Day	7% 7% 2 6% 5% 5% 5% 4 7% 10% 42%	4465
August	1st to 10th	Day	1 1 1 2 2 3 3 2 5% 7% 74%	4104
	11th to 20th	Day	4 1 1 3 2 3 3 2 5% 9% 67%	3949
	21st to end	Day	4 2 1 3 4 4 5% 4 7% 10% 54%	3965
September	1st to 10th	Day	9% 4 1 6% 5% 5% 5% 3 5% 7% 50%	2090
	11th to 20th	Day	9% 5% 2 7% 4 4 4 4 6% 7% 47%	2090
	21st to end	Day	7% 4 2 6% 3 4 4 4 5% 7% 56%	2090
October	1st to 10th	Day	5% 4 2 3 3 3 4 3 5% 7% 62%	2090
	11th to 20th	Day	12% 4 2 4 3 3 3 2 4 4 60%	1905
	21st to end	Day	13% 4 1 4 2 3 3 2 3 4 61%	2090
November	1st to 10th	Day	14% 6% 2 5% 3 4 4 2 4 5% 52%	1898
	11th to 20th	Day	10% 5% 2 4 3 3 4 4 4 6% 55%	1786
	21st to end	Day	18% 6% 2 6% 4 3 3 2 3 6% 48%	1710
December	1st to 10th	Day	14% 6% 2 4 3 3 4 3 5% 5% 51%	1710
	11th to 20th	Day	15% 7% 3 6% 4 3 3 3 4 5% 45%	2161
	21st to end	Day	17% 6% 2 4 3 3 3 2 4 5% 53%	3135
January	1st to 10th	Night	16% 5% 2 3 2 2 2 2 3 4 59%	4108
	11th to 20th	Night	13% 5% 1 3 2 2 2 2 3 4 64%	4120
	21st to end	Night	18% 7% 3 6% 3 3 3 2 4 6% 45%	4518
February	1st to 10th	Night	16% 7% 3 5% 3 3 3 3 4 5% 50%	2280
	11th to 20th	Night	17% 7% 2 5% 2 3 3 3 3 6% 50%	2218
	21st to end	Night	18% 5% 2 3 3 3 3 2 4 6% 50%	1879
March	1st to 10th	Night	14% 7% 2 7% 4 4 4 3 5% 6% 44%	3419
	11th to 20th	Night	17% 7% 2 6% 4 4 4 4 6% 8% 39%	3480
	21st to end	Night	11% 7% 3 7% 5% 4 4 3 5% 6% 47%	3817
April	1st to 10th	Night	9% 5% 2 5% 4 3 3 4 6% 6% 52%	2090
	11th to 20th	Night	14% 5% 2 6% 4 4 3 3 6% 7% 47%	2032
	21st to end	Night	13% 5% 2 5% 4 3 3 3 6% 6% 50%	1744
May	1st to 10th	Night	21% 8% 2 5% 4 3 2 2 5% 7% 39%	2823
	11th to 20th	Night	10% 6% 2 6% 4 4 4 4 5% 6% 48%	2823
	21st to end	Night	11% 6% 2 5% 4 4 5% 4 7% 8% 44%	3090
June	1st to 10th	Night	4 3 1 3 3 4 3 3 6% 10% 60%	1710
	11th to 20th	Night	4 2 1 3 4 3 4 3 6% 9% 60%	1710
	21st to end	Night	4 3 2 4 4 4 4 4 5% 10% 56%	1710
July	1st to 10th	Night	4 3 1 3 3 4 4 4 8% 8% 60%	2850
	11th to 20th	Night	2 2 1 3 2 3 3 3 6% 9% 65%	2850
	21st to end	Night	6% 6% 2 5% 5% 4 4 4 7% 10% 47%	3098
August	1st to 10th	Night	1 1 1 1 2 2 2 4 7% 80%	2836
	11th to 20th	Night	4 2 1 3 2 2 3 3 6% 10% 64%	2885
	21st to end	Night	3 2 1 3 3 3 4 3 6% 11% 61%	3694
September	1st to 10th	Night	8% 4 1 3 4 4 5% 4 6% 7% 53%	2090
	11th to 20th	Night	9% 5% 1 5% 4 4 5% 4 5% 7% 50%	2090
	21st to end	Night	7% 3 1 4 2 3 3 4 5% 6% 62%	2090
October	1st to 10th	Night	6% 3 1 3 3 3 2 3 4 6% 67%	2090
	11th to 20th	Night	11% 3 1 3 2 3 3 3 5% 5% 61%	2256
	21st to end	Night	13% 4 2 4 3 2 2 2 3 4 61%	2508
November	1st to 10th	Night	12% 5% 2 5% 3 3 2 3 3 5% 58%	2280
	11th to 20th	Night	8% 5% 2 5% 4 3 3 3 4 5% 57%	2389
	21st to end	Night	17% 5% 2 5% 4 2 3 3 4 5% 49%	2470
December	1st to 10th	Night	13% 5% 2 4 3 3 3 3 5% 6% 53%	2470
	11th to 20th	Night	14% 7% 2 7% 3 3 3 2 4 5% 49%	3036
	21st to end	Night	17% 7% 2 3 2 2 2 2 3 4 56%	4532

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	33% 4 5% 18% 28% 12%	2848
	11th to 20th	Day	30% 3 6% 19% 30% 12%	2850
	21st to end	Day	45% 2 3 13% 25% 11%	3176
February	1st to 10th	Day	41% 3 6% 15% 22% 14%	1900
	11th to 20th	Day	41% 3 6% 18% 21% 11%	1859
	21st to end	Day	39% 3 4 16% 20% 17%	1574
March	1st to 10th	Day	42% 5% 5% 16% 21% 11%	3436
	11th to 20th	Day	48% 7% 10% 12% 16% 7%	3480
	21st to end	Day	39% 6% 9% 17% 22% 7%	3814
April	1st to 10th	Day	40% 5% 7% 18% 16% 13%	2090
	11th to 20th	Day	42% 5% 7% 17% 19% 10%	2094
	21st to end	Day	37% 5% 6% 20% 24% 8%	2431
May	1st to 10th	Day	49% 6% 9% 18% 12% 5%	4120
	11th to 20th	Day	39% 6% 7% 18% 27% 3	4086
	21st to end	Day	42% 10% 12% 22% 12% 3	4489
June	1st to 10th	Day	28% 7% 13% 27% 22% 4	2470
	11th to 20th	Day	28% 6% 12% 29% 19% 7%	2470
	21st to end	Day	31% 8% 11% 24% 21% 4	2470
July	1st to 10th	Day	28% 7% 18% 37% 10% 1	4056
	11th to 20th	Day	20% 7% 14% 37% 18% 4	4051
	21st to end	Day	35% 8% 15% 30% 12%	4325
August	1st to 10th	Day	11% 4 11% 37% 35% 2	4090
	11th to 20th	Day	15% 4 19% 42% 18% 2	3988
	21st to end	Day	21% 11% 19% 28% 18% 3	3964
September	1st to 10th	Day	33% 6% 10% 21% 18% 11%	2090
	11th to 20th	Day	36% 6% 11% 20% 20% 6%	2090
	21st to end	Day	28% 5% 8% 23% 22% 14%	2090
October	1st to 10th	Day	14% 3 6% 13% 25% 38%	3480
	11th to 20th	Day	18% 2 6% 17% 35% 22%	3145
	21st to end	Day	23% 3 5% 22% 35% 12%	3428
November	1st to 10th	Day	36% 5% 8% 20% 22% 10%	1898
	11th to 20th	Day	31% 4 9% 18% 24% 14%	1786
	21st to end	Day	40% 4 4 18% 21% 13%	1710
December	1st to 10th	Day	36% 4 9% 21% 21% 10%	1710
	11th to 20th	Day	41% 4 7% 13% 24% 11%	2159
	21st to end	Day	35% 3 5% 16% 27% 14%	3135
January	1st to 10th	Night	32% 3 3 18% 29% 15%	4108
	11th to 20th	Night	28% 2 5% 17% 30% 20%	4120
	21st to end	Night	42% 4 4 14% 24% 12%	4518
February	1st to 10th	Night	39% 3 6% 13% 23% 16%	2280
	11th to 20th	Night	39% 3 5% 17% 22% 14%	2218
	21st to end	Night	38% 3 6% 16% 19% 18%	1879
March	1st to 10th	Night	41% 6% 7% 14% 22% 11%	3419
	11th to 20th	Night	44% 8% 10% 16% 15% 7%	3480
	21st to end	Night	39% 6% 8% 17% 23% 7%	3817
April	1st to 10th	Night	32% 6% 10% 20% 17% 15%	2090
	11th to 20th	Night	38% 5% 10% 16% 18% 14%	2032
	21st to end	Night	35% 5% 10% 18% 24% 8%	1744
May	1st to 10th	Night	45% 6% 10% 19% 15% 6%	2850
	11th to 20th	Night	34% 7% 11% 21% 22% 5%	2824
	21st to end	Night	35% 9% 12% 28% 11% 5%	3099
June	1st to 10th	Night	20% 7% 15% 31% 22% 4	1710
	11th to 20th	Night	19% 6% 15% 32% 21% 7%	1710
	21st to end	Night	25% 7% 12% 27% 24% 5%	1710
July	1st to 10th	Night	20% 7% 21% 42% 9% 1	2805
	11th to 20th	Night	15% 6% 19% 39% 19% 2	2796
	21st to end	Night	31% 8% 19% 32% 10% 1	2999
August	1st to 10th	Night	6% 5% 11% 38% 36% 3	2826
	11th to 20th	Night	17% 5% 22% 37% 17% 2	2912
	21st to end	Night	18% 10% 22% 31% 17% 3	3694
September	1st to 10th	Night	29% 7% 12% 23% 17% 12%	2090
	11th to 20th	Night	34% 6% 13% 20% 18% 8%	2090
	21st to end	Night	22% 6% 11% 24% 22% 15%	2090
October	1st to 10th	Night	14% 3 6% 15% 21% 42%	3480
	11th to 20th	Night	16% 3 6% 16% 33% 26%	3742
	21st to end	Night	23% 3 4 19% 34% 17%	4120
November	1st to 10th	Night	32% 4 7% 20% 24% 14%	2280
	11th to 20th	Night	29% 5% 7% 18% 25% 16%	2389
	21st to end	Night	39% 3 7% 15% 22% 14%	2470
December	1st to 10th	Night	33% 4 8% 23% 20% 12%	2470
	11th to 20th	Night	40% 3 5% 12% 24% 16%	3037
	21st to end	Night	35% 2 5% 14% 29% 15%	4532

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	19% 12% 38% 24% 6% 1	270
	11th to 20th	Day	21% 13% 32% 25% 8% 1	270
	21st to end	Day	20% 12% 38% 22% 8%	297
February	1st to 10th	Day	24% 16% 33% 20% 7%	270
	11th to 20th	Day	22% 16% 40% 18% 4	270
	21st to end	Day	26% 14% 41% 17% 1	225
March	1st to 10th	Day	22% 14% 39% 21% 3	270
	11th to 20th	Day	19% 18% 37% 21% 4 1	270
	21st to end	Day	18% 13% 44% 18% 6% 1	297
April	1st to 10th	Day	19% 16% 41% 18% 6%	270
	11th to 20th	Day	19% 13% 38% 21% 7% 1	292
	21st to end	Day	17% 12% 38% 24% 8% 1	611
May	1st to 10th	Day	15% 12% 35% 29% 9%	653
	11th to 20th	Day	17% 5% 28% 32% 15% 3	675
	21st to end	Day	14% 5% 30% 30% 17% 3	734
June	1st to 10th	Day	6% 2 18% 40% 23% 10%	680
	11th to 20th	Day	6% 2 19% 43% 27% 4	680
	21st to end	Day	6% 1 12% 37% 32% 11%	680
July	1st to 10th	Day	6% 1 10% 32% 38% 13%	671
	11th to 20th	Day	2 1 6% 35% 45% 12%	668
	21st to end	Day	4 1 5% 34% 42% 15%	739
August	1st to 10th	Day	3 5% 28% 48% 16%	676
	11th to 20th	Day	6% 3 32% 45% 14%	612
	21st to end	Day	5% 4 23% 40% 27%	415
September	1st to 10th	Day	7% 1 6% 23% 36% 27%	300
	11th to 20th	Day	5% 7% 23% 46% 19%	300
	21st to end	Day	9% 2 9% 28% 35% 17%	300
October	1st to 10th	Day	3 3 12% 31% 40% 12%	300
	11th to 20th	Day	11% 5% 22% 32% 25% 7%	300
	21st to end	Day	20% 10% 25% 20% 21% 3	330
November	1st to 10th	Day	20% 5% 31% 29% 11% 5%	282
	11th to 20th	Day	16% 9% 27% 27% 18% 3	270
	21st to end	Day	20% 15% 31% 23% 9% 1	270
December	1st to 10th	Day	16% 7% 32% 27% 12% 5%	270
	11th to 20th	Day	20% 14% 35% 24% 8%	270
	21st to end	Day	20% 8% 37% 26% 8% 1	297
January	1st to 10th	Night	18% 9% 35% 29% 9% 1	950
	11th to 20th	Night	21% 11% 31% 31% 7% 1	950
	21st to end	Night	17% 10% 33% 33% 6%	1031
February	1st to 10th	Night	21% 13% 34% 28% 5%	760
	11th to 20th	Night	21% 11% 40% 25% 3	744
	21st to end	Night	21% 13% 45% 18% 3	623
March	1st to 10th	Night	20% 12% 37% 27% 4	570
	11th to 20th	Night	17% 9% 38% 30% 5%	570
	21st to end	Night	13% 14% 43% 26% 4	627
April	1st to 10th	Night	11% 11% 44% 32% 3	570
	11th to 20th	Night	15% 13% 39% 26% 6%	563
	21st to end	Night	15% 9% 42% 26% 8%	570
May	1st to 10th	Night	12% 10% 42% 30% 6%	570
	11th to 20th	Night	12% 6% 35% 31% 13% 1	561
	21st to end	Night	9% 5% 31% 38% 15% 1	617
June	1st to 10th	Night	4 2 22% 46% 24% 2	570
	11th to 20th	Night	4 1 28% 49% 16% 1	570
	21st to end	Night	4 1 16% 47% 29% 4	570
July	1st to 10th	Night	5% 1 12% 46% 33% 4	555
	11th to 20th	Night	3 1 9% 52% 32% 2	552
	21st to end	Night	2 1 6% 50% 38% 3	624
August	1st to 10th	Night	2 3 54% 36% 5%	567
	11th to 20th	Night	8% 1 7% 44% 37% 5%	564
	21st to end	Night	4 1 5% 41% 43% 6%	627
September	1st to 10th	Night	9% 1 8% 39% 38% 5%	570
	11th to 20th	Night	10% 2 8% 38% 39% 4	570
	21st to end	Night	8% 1 11% 40% 36% 4	570
October	1st to 10th	Night	7% 1 11% 50% 26% 5%	570
	11th to 20th	Night	13% 4 24% 38% 19% 2	736
	21st to end	Night	14% 9% 26% 32% 18% 1	836
November	1st to 10th	Night	14% 4 27% 38% 16% 1	760
	11th to 20th	Night	10% 8% 29% 37% 15% 1	869
	21st to end	Night	20% 9% 29% 31% 11% 1	950
December	1st to 10th	Night	15% 7% 34% 35% 10%	950
	11th to 20th	Night	20% 9% 29% 34% 7%	950
	21st to end	Night	20% 7% 35% 31% 7%	1045

Page generated at 2024-11-03 01:11:19. Version ac07

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