Lost Maples State Natural Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lost Maples State Natural Area clear sky chart from 2005-11-06 to 2024-08-15.

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	12% 6% 2 5% 4 4 4 3 5% 7% 47%	95397
	Night	12% 6% 2 4 3 3 3 3 5% 7% 52%	93401
Transparency	Day	37% 4 9% 21% 19% 10%	95174
	Night	34% 4 10% 20% 19% 13%	93230
Seeing	Day	15% 9% 25% 30% 18% 3	14513
	Night	16% 8% 27% 35% 14% 1	24441

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	11% 6% 2 4 2 3 2 2 4 6% 58%	2847
	11th to 20th	Day	10% 9% 2 3 2 2 2 3 4 5% 58%	2950
	21st to end	Day	14% 7% 2 5% 3 3 3 3 5% 9% 47%	3487
February	1st to 10th	Day	13% 8% 2 5% 4 3 3 2 4 6% 50%	1900
	11th to 20th	Day	15% 8% 2 5% 3 4 3 4 4 6% 47%	1849
	21st to end	Day	14% 6% 2 4 2 3 3 3 4 6% 53%	1570
March	1st to 10th	Day	15% 8% 2 7% 4 3 2 2 4 5% 46%	3244
	11th to 20th	Day	19% 11% 3 9% 4 4 3 3 4 5% 36%	3480
	21st to end	Day	13% 6% 2 5% 3 4 4 3 5% 6% 48%	3814
April	1st to 10th	Day	14% 7% 2 5% 4 3 3 3 6% 7% 46%	2090
	11th to 20th	Day	17% 6% 2 5% 4 3 3 3 5% 7% 45%	2231
	21st to end	Day	14% 8% 3 5% 4 3 4 2 4 6% 47%	2304
May	1st to 10th	Day	20% 8% 3 6% 5% 4 4 3 6% 6% 37%	4082
	11th to 20th	Day	15% 7% 2 6% 4 4 4 3 5% 7% 44%	4082
	21st to end	Day	12% 7% 3 6% 4 5% 5% 4 6% 8% 40%	4477
June	1st to 10th	Day	7% 5% 1 6% 4 3 4 4 6% 9% 49%	2470
	11th to 20th	Day	9% 5% 2 5% 5% 5% 5% 4 6% 8% 47%	2470
	21st to end	Day	10% 6% 2 6% 6% 5% 5% 5% 7% 9% 39%	2470
July	1st to 10th	Day	8% 6% 2 5% 5% 4 5% 5% 6% 9% 47%	4120
	11th to 20th	Day	6% 4 2 5% 4 4 5% 4 6% 9% 51%	4120
	21st to end	Day	9% 5% 2 6% 5% 5% 5% 4 7% 10% 42%	4442
August	1st to 10th	Day	2 3 1 3 4 4 4 4 6% 8% 62%	2269
	11th to 20th	Day	7% 4 2 5% 4 6% 5% 4 6% 9% 49%	2172
	21st to end	Day	7% 5% 2 6% 5% 5% 6% 4 6% 9% 44%	2368
September	1st to 10th	Day	12% 7% 3 8% 7% 5% 5% 3 6% 6% 40%	1980
	11th to 20th	Day	11% 6% 2 7% 5% 6% 5% 5% 6% 7% 41%	1980
	21st to end	Day	9% 6% 2 7% 4 4 5% 4 6% 7% 46%	1980
October	1st to 10th	Day	8% 5% 2 6% 4 4 5% 3 5% 8% 51%	1980
	11th to 20th	Day	14% 5% 2 4 3 4 3 3 5% 6% 50%	1962
	21st to end	Day	13% 5% 2 5% 3 2 3 2 3 4 57%	1980
November	1st to 10th	Day	14% 7% 2 6% 4 3 4 3 5% 6% 48%	1801
	11th to 20th	Day	11% 8% 2 5% 3 4 3 4 4 6% 50%	1710
	21st to end	Day	16% 8% 2 5% 3 3 3 3 4 5% 48%	1710
December	1st to 10th	Day	14% 7% 2 5% 3 3 3 3 5% 6% 50%	1710
	11th to 20th	Day	14% 9% 2 5% 4 4 3 3 5% 5% 47%	2161
	21st to end	Day	13% 6% 2 4 2 2 3 3 4 4 58%	3135
January	1st to 10th	Night	12% 5% 2 4 3 3 3 2 4 6% 56%	4108
	11th to 20th	Night	10% 5% 2 3 2 2 2 2 3 4 67%	4047
	21st to end	Night	18% 7% 2 5% 3 3 2 2 4 5% 47%	4180
February	1st to 10th	Night	14% 7% 2 4 3 2 2 2 5% 6% 52%	2280
	11th to 20th	Night	15% 8% 2 4 3 3 3 3 4 5% 51%	2218
	21st to end	Night	14% 5% 2 5% 3 3 3 3 5% 6% 49%	1884
March	1st to 10th	Night	13% 9% 2 5% 3 3 3 3 5% 6% 47%	3614
	11th to 20th	Night	16% 13% 3 7% 4 3 4 3 4 4 38%	3480
	21st to end	Night	14% 9% 3 5% 3 3 3 3 4 5% 49%	3817
April	1st to 10th	Night	10% 7% 2 5% 4 3 3 3 5% 6% 51%	2090
	11th to 20th	Night	16% 6% 3 6% 3 3 4 3 4 5% 47%	1894
	21st to end	Night	17% 7% 2 4 4 2 3 3 4 6% 48%	1875
May	1st to 10th	Night	22% 10% 2 5% 3 3 3 3 4 6% 40%	2823
	11th to 20th	Night	12% 6% 2 4 4 3 3 3 4 6% 52%	2823
	21st to end	Night	13% 7% 2 4 3 3 4 3 6% 8% 48%	3090
June	1st to 10th	Night	4 3 1 3 3 3 3 4 6% 10% 60%	1710
	11th to 20th	Night	6% 4 2 3 3 3 4 5% 5% 8% 57%	1710
	21st to end	Night	8% 5% 1 5% 4 4 3 3 6% 10% 52%	1710
July	1st to 10th	Night	6% 3 2 4 3 4 4 4 6% 10% 53%	2850
	11th to 20th	Night	5% 4 1 4 3 4 4 4 6% 9% 56%	2850
	21st to end	Night	12% 7% 2 5% 4 3 3 4 5% 9% 45%	3116
August	1st to 10th	Night	2 2 1 3 2 2 3 3 5% 8% 68%	1890
	11th to 20th	Night	5% 3 1 5% 3 4 4 4 6% 10% 54%	1828
	21st to end	Night	7% 5% 2 5% 3 4 5% 4 7% 10% 49%	1988
September	1st to 10th	Night	10% 6% 2 6% 3 5% 4 3 5% 9% 48%	1980
	11th to 20th	Night	11% 7% 2 5% 4 4 4 4 5% 7% 46%	1980
	21st to end	Night	8% 5% 2 5% 4 3 4 3 5% 8% 51%	1980
October	1st to 10th	Night	7% 5% 2 4 4 3 3 3 4 8% 58%	1980
	11th to 20th	Night	14% 5% 2 4 3 2 3 3 5% 6% 54%	1980
	21st to end	Night	15% 4 1 4 2 2 2 2 3 4 62%	2376
November	1st to 10th	Night	12% 7% 2 4 3 3 2 2 4 6% 56%	2272
	11th to 20th	Night	10% 7% 2 4 3 3 2 3 5% 6% 56%	2470
	21st to end	Night	17% 6% 1 4 3 3 3 3 5% 6% 48%	2470
December	1st to 10th	Night	14% 7% 2 3 2 2 3 3 5% 6% 53%	2470
	11th to 20th	Night	15% 8% 2 5% 3 3 3 2 4 5% 48%	3036
	21st to end	Night	17% 7% 1 3 2 2 2 2 3 7% 55%	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	29% 2 3 15% 26% 24%	2848
	11th to 20th	Day	31% 1 5% 13% 29% 20%	2950
	21st to end	Day	37% 3 6% 15% 28% 11%	3487
February	1st to 10th	Day	38% 3 5% 13% 22% 19%	1900
	11th to 20th	Day	40% 4 5% 16% 20% 15%	1859
	21st to end	Day	34% 3 7% 16% 22% 18%	1570
March	1st to 10th	Day	43% 2 6% 12% 21% 16%	3244
	11th to 20th	Day	53% 3 6% 11% 16% 11%	3480
	21st to end	Day	36% 4 8% 16% 18% 18%	3814
April	1st to 10th	Day	39% 4 8% 16% 18% 15%	2090
	11th to 20th	Day	40% 4 7% 19% 17% 14%	2231
	21st to end	Day	41% 3 6% 19% 18% 12%	2304
May	1st to 10th	Day	49% 4 9% 14% 16% 8%	4120
	11th to 20th	Day	40% 4 8% 20% 20% 9%	4086
	21st to end	Day	41% 5% 11% 26% 13% 3	4489
June	1st to 10th	Day	30% 5% 15% 27% 20% 3	2470
	11th to 20th	Day	35% 6% 12% 25% 18% 5%	2470
	21st to end	Day	39% 7% 11% 23% 16% 4	2470
July	1st to 10th	Day	32% 6% 17% 36% 8% 1	4056
	11th to 20th	Day	28% 7% 15% 32% 16% 2	4051
	21st to end	Day	32% 8% 19% 29% 12% 1	4302
August	1st to 10th	Day	20% 5% 15% 40% 19% 1	2256
	11th to 20th	Day	30% 7% 17% 31% 12% 3	2172
	21st to end	Day	35% 7% 15% 27% 13% 3	2368
September	1st to 10th	Day	44% 6% 10% 18% 16% 5%	1980
	11th to 20th	Day	40% 7% 12% 20% 16% 5%	1980
	21st to end	Day	37% 5% 10% 20% 19% 10%	1980
October	1st to 10th	Day	32% 4 10% 23% 23% 8%	1980
	11th to 20th	Day	35% 4 8% 16% 21% 16%	1962
	21st to end	Day	33% 3 4 16% 25% 20%	1980
November	1st to 10th	Day	39% 4 8% 20% 18% 11%	1801
	11th to 20th	Day	37% 4 6% 17% 20% 16%	1710
	21st to end	Day	41% 3 5% 16% 21% 15%	1710
December	1st to 10th	Day	36% 4 9% 18% 23% 10%	1710
	11th to 20th	Day	41% 4 5% 12% 21% 17%	2159
	21st to end	Day	32% 2 4 16% 29% 17%	3135
January	1st to 10th	Night	30% 2 3 13% 28% 24%	4108
	11th to 20th	Night	25% 2 3 17% 27% 26%	4047
	21st to end	Night	41% 2 4 12% 26% 15%	4180
February	1st to 10th	Night	34% 3 7% 13% 22% 21%	2280
	11th to 20th	Night	36% 3 6% 17% 21% 17%	2218
	21st to end	Night	35% 3 7% 15% 21% 18%	1884
March	1st to 10th	Night	40% 4 7% 14% 21% 14%	3614
	11th to 20th	Night	50% 4 7% 12% 14% 13%	3480
	21st to end	Night	38% 4 8% 15% 16% 18%	3817
April	1st to 10th	Night	34% 4 10% 17% 17% 17%	2090
	11th to 20th	Night	40% 4 9% 14% 17% 17%	1894
	21st to end	Night	40% 3 9% 18% 17% 13%	1875
May	1st to 10th	Night	47% 3 9% 17% 13% 11%	2850
	11th to 20th	Night	34% 3 11% 23% 20% 9%	2824
	21st to end	Night	36% 5% 14% 27% 12% 7%	3099
June	1st to 10th	Night	19% 6% 19% 33% 20% 2	1710
	11th to 20th	Night	25% 5% 15% 28% 22% 6%	1710
	21st to end	Night	28% 5% 18% 28% 16% 4	1710
July	1st to 10th	Night	25% 8% 23% 37% 7% 1	2805
	11th to 20th	Night	24% 8% 19% 30% 18% 1	2796
	21st to end	Night	35% 7% 21% 29% 9% 1	3017
August	1st to 10th	Night	15% 5% 20% 40% 19% 1	1879
	11th to 20th	Night	23% 8% 23% 29% 15% 3	1828
	21st to end	Night	30% 8% 21% 25% 14% 3	1988
September	1st to 10th	Night	34% 7% 13% 22% 18% 6%	1980
	11th to 20th	Night	36% 7% 17% 20% 15% 4	1980
	21st to end	Night	32% 6% 12% 21% 19% 10%	1980
October	1st to 10th	Night	27% 4 12% 26% 20% 11%	1980
	11th to 20th	Night	32% 3 10% 17% 21% 15%	1980
	21st to end	Night	29% 1 5% 17% 25% 22%	2376
November	1st to 10th	Night	32% 3 8% 20% 23% 13%	2272
	11th to 20th	Night	31% 3 7% 21% 20% 17%	2470
	21st to end	Night	37% 4 7% 15% 20% 17%	2470
December	1st to 10th	Night	33% 4 9% 19% 22% 14%	2470
	11th to 20th	Night	40% 2 5% 14% 17% 22%	3037
	21st to end	Night	34% 2 4 14% 28% 18%	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	24% 14% 37% 18% 6% 1	270
	11th to 20th	Day	25% 14% 33% 20% 6% 1	270
	21st to end	Day	19% 20% 33% 23% 5%	297
February	1st to 10th	Day	29% 14% 32% 18% 7%	270
	11th to 20th	Day	27% 17% 33% 17% 6%	270
	21st to end	Day	25% 22% 39% 14% 1	225
March	1st to 10th	Day	21% 23% 39% 14% 2	270
	11th to 20th	Day	23% 22% 38% 14% 3	270
	21st to end	Day	20% 21% 44% 12% 2 1	297
April	1st to 10th	Day	23% 20% 37% 19% 1	270
	11th to 20th	Day	19% 19% 40% 18% 3	429
	21st to end	Day	17% 16% 46% 18% 4	484
May	1st to 10th	Day	21% 11% 40% 23% 5%	653
	11th to 20th	Day	19% 11% 34% 28% 7% 1	675
	21st to end	Day	19% 10% 33% 28% 9%	734
June	1st to 10th	Day	7% 5% 23% 45% 19% 1	680
	11th to 20th	Day	11% 3 23% 45% 16% 1	680
	21st to end	Day	12% 3 16% 38% 26% 5%	680
July	1st to 10th	Day	11% 4 13% 38% 28% 6%	671
	11th to 20th	Day	6% 2 7% 42% 36% 5%	668
	21st to end	Day	6% 1 9% 42% 35% 7%	728
August	1st to 10th	Day	1 1 6% 47% 37% 8%	487
	11th to 20th	Day	8% 1 8% 38% 37% 8%	454
	21st to end	Day	6% 3 6% 35% 40% 10%	487
September	1st to 10th	Day	10% 1 9% 31% 39% 9%	270
	11th to 20th	Day	7% 6% 33% 47% 7%	270
	21st to end	Day	10% 2 10% 35% 37% 6%	270
October	1st to 10th	Day	9% 5% 16% 41% 26% 4	270
	11th to 20th	Day	13% 4 23% 39% 19% 2	270
	21st to end	Day	21% 14% 26% 25% 11% 2	297
November	1st to 10th	Day	19% 7% 34% 27% 11% 1	270
	11th to 20th	Day	21% 10% 30% 24% 10% 4	270
	21st to end	Day	27% 17% 32% 15% 8% 1	270
December	1st to 10th	Day	17% 15% 29% 28% 10% 1	270
	11th to 20th	Day	21% 20% 31% 21% 6%	270
	21st to end	Day	17% 16% 33% 26% 6% 1	297
January	1st to 10th	Night	17% 11% 30% 33% 7% 1	950
	11th to 20th	Night	21% 10% 30% 32% 7%	903
	21st to end	Night	22% 11% 29% 31% 8%	836
February	1st to 10th	Night	22% 13% 31% 28% 6%	760
	11th to 20th	Night	23% 13% 33% 27% 4	744
	21st to end	Night	21% 13% 41% 23% 2	628
March	1st to 10th	Night	24% 12% 35% 25% 4	692
	11th to 20th	Night	21% 11% 35% 29% 5%	570
	21st to end	Night	20% 11% 42% 22% 4	627
April	1st to 10th	Night	12% 16% 44% 25% 3	570
	11th to 20th	Night	19% 15% 43% 21% 2	563
	21st to end	Night	20% 11% 45% 20% 4	570
May	1st to 10th	Night	18% 11% 43% 24% 4	570
	11th to 20th	Night	17% 8% 36% 32% 6%	561
	21st to end	Night	17% 9% 36% 31% 7%	617
June	1st to 10th	Night	5% 2 30% 48% 15%	570
	11th to 20th	Night	9% 3 36% 44% 8%	570
	21st to end	Night	9% 4 26% 42% 19% 1	570
July	1st to 10th	Night	10% 3 15% 50% 21% 1	555
	11th to 20th	Night	5% 2 16% 50% 26% 2	552
	21st to end	Night	7% 2 11% 52% 27% 1	624
August	1st to 10th	Night	3 1 10% 53% 33% 1	567
	11th to 20th	Night	5% 1 7% 50% 35% 1	549
	21st to end	Night	8% 2 9% 42% 36% 3	594
September	1st to 10th	Night	10% 1 9% 43% 34% 3	540
	11th to 20th	Night	13% 1 11% 40% 33% 2	540
	21st to end	Night	9% 3 14% 37% 31% 4	540
October	1st to 10th	Night	9% 3 14% 44% 28% 1	540
	11th to 20th	Night	17% 5% 22% 36% 19% 2	540
	21st to end	Night	17% 8% 25% 28% 19% 2	792
November	1st to 10th	Night	17% 5% 21% 38% 18% 2	792
	11th to 20th	Night	14% 8% 24% 37% 15% 2	950
	21st to end	Night	21% 10% 26% 31% 11% 1	950
December	1st to 10th	Night	18% 7% 27% 36% 11% 1	950
	11th to 20th	Night	23% 11% 27% 31% 8%	950
	21st to end	Night	19% 11% 28% 34% 8%	1045

Page generated at 2024-08-12 08:52:48. Version ac07

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