Lipantitlan State Historic Site
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lipantitlan State Historic Site clear sky chart from 2005-11-06 to 2024-11-02.

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% 6% 2 6% 5% 4 5% 4 6% 8% 43%	100925
	Night	13% 6% 2 5% 3 3 4 3 5% 7% 48%	98161
Transparency	Day	37% 7% 13% 21% 15% 7%	100736
	Night	34% 6% 14% 22% 15% 8%	98021
Seeing	Day	11% 6% 22% 32% 23% 8%	14548
	Night	14% 5% 23% 37% 19% 2	24480

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	18% 7% 2 5% 4 4 3 2 4 5% 46%	2847
	11th to 20th	Day	15% 5% 2 5% 3 2 2 2 4 6% 52%	2850
	21st to end	Day	24% 6% 2 6% 3 2 4 4 6% 7% 37%	3459
February	1st to 10th	Day	19% 8% 3 7% 4 4 4 3 4 6% 39%	1900
	11th to 20th	Day	18% 7% 3 6% 4 3 3 2 4 6% 44%	1849
	21st to end	Day	18% 7% 3 5% 5% 3 3 3 5% 5% 45%	1592
March	1st to 10th	Day	17% 8% 3 7% 5% 4 5% 4 5% 8% 33%	3436
	11th to 20th	Day	24% 10% 4 9% 5% 4 4 3 4 6% 27%	3480
	21st to end	Day	9% 4 2 4 4 4 4 4 5% 8% 52%	3814
April	1st to 10th	Day	12% 7% 3 6% 4 4 4 4 6% 7% 43%	2090
	11th to 20th	Day	17% 7% 2 6% 5% 4 4 3 5% 6% 41%	2066
	21st to end	Day	12% 7% 2 6% 5% 4 4 3 5% 7% 43%	2273
May	1st to 10th	Day	14% 7% 3 8% 4 4 4 4 6% 9% 36%	4082
	11th to 20th	Day	8% 6% 3 7% 5% 5% 5% 4 6% 7% 44%	4082
	21st to end	Day	6% 5% 2 5% 5% 4 5% 4 6% 9% 49%	4477
June	1st to 10th	Day	5% 4 2 4 3 5% 5% 4 7% 10% 51%	2470
	11th to 20th	Day	4 4 1 6% 5% 5% 6% 5% 7% 10% 47%	2470
	21st to end	Day	7% 5% 2 6% 6% 5% 7% 4 9% 10% 38%	2470
July	1st to 10th	Day	6% 5% 2 6% 5% 6% 6% 5% 7% 10% 43%	4120
	11th to 20th	Day	5% 7% 3 8% 7% 7% 7% 6% 8% 10% 33%	4120
	21st to end	Day	8% 6% 3 7% 6% 5% 5% 5% 7% 10% 37%	4465
August	1st to 10th	Day	1 2 1 2 3 3 3 3 6% 9% 68%	3986
	11th to 20th	Day	2 2 1 5% 3 4 6% 6% 9% 13% 48%	3726
	21st to end	Day	4 5% 2 7% 6% 6% 6% 5% 9% 12% 38%	3899
September	1st to 10th	Day	9% 6% 3 8% 7% 7% 6% 5% 7% 9% 33%	2090
	11th to 20th	Day	10% 6% 3 8% 6% 6% 6% 5% 6% 8% 37%	2090
	21st to end	Day	8% 4 2 6% 5% 5% 5% 4 6% 9% 46%	2090
October	1st to 10th	Day	6% 4 1 5% 5% 5% 4 4 6% 8% 51%	2090
	11th to 20th	Day	11% 5% 2 5% 4 5% 4 4 5% 7% 49%	1969
	21st to end	Day	9% 4 2 5% 4 3 4 4 4 5% 57%	2090
November	1st to 10th	Day	11% 6% 2 7% 5% 5% 4 3 6% 7% 44%	1868
	11th to 20th	Day	15% 6% 3 5% 5% 4 4 3 5% 6% 46%	1899
	21st to end	Day	16% 7% 4 6% 4 3 4 4 5% 5% 41%	1710
December	1st to 10th	Day	18% 7% 2 5% 4 4 3 3 5% 5% 43%	1710
	11th to 20th	Day	16% 8% 3 7% 4 4 4 3 6% 6% 40%	2161
	21st to end	Day	16% 7% 2 7% 4 4 4 2 4 7% 45%	3135
January	1st to 10th	Night	19% 7% 2 5% 3 2 3 3 4 5% 46%	4108
	11th to 20th	Night	16% 5% 2 4 3 2 2 2 4 6% 55%	4120
	21st to end	Night	23% 7% 3 6% 4 3 3 3 5% 6% 36%	4238
February	1st to 10th	Night	18% 7% 2 6% 4 4 4 4 5% 5% 42%	2280
	11th to 20th	Night	20% 7% 2 4 2 2 3 3 5% 7% 45%	2218
	21st to end	Night	19% 8% 2 5% 4 3 3 3 4 6% 45%	1860
March	1st to 10th	Night	25% 8% 2 6% 3 3 4 3 5% 7% 34%	3419
	11th to 20th	Night	26% 10% 3 8% 5% 5% 4 3 4 5% 27%	3480
	21st to end	Night	16% 5% 1 4 3 2 3 2 3 6% 54%	3817
April	1st to 10th	Night	15% 6% 3 8% 4 4 4 3 6% 8% 39%	2090
	11th to 20th	Night	18% 8% 2 5% 4 3 3 4 4 6% 42%	2063
	21st to end	Night	17% 8% 2 6% 4 3 3 4 6% 5% 40%	1898
May	1st to 10th	Night	24% 8% 2 5% 4 3 4 3 5% 7% 35%	2823
	11th to 20th	Night	16% 8% 2 5% 4 4 4 3 5% 7% 42%	2823
	21st to end	Night	10% 7% 2 6% 5% 5% 4 4 6% 9% 42%	3090
June	1st to 10th	Night	5% 3 1 3 2 3 4 4 7% 9% 58%	1710
	11th to 20th	Night	3 4 2 4 4 4 4 4 5% 10% 56%	1710
	21st to end	Night	5% 3 2 4 4 4 5% 4 7% 11% 51%	1710
July	1st to 10th	Night	5% 4 1 4 3 3 4 3 7% 11% 55%	2850
	11th to 20th	Night	4 4 2 6% 5% 5% 7% 5% 7% 12% 42%	2850
	21st to end	Night	7% 6% 2 5% 4 4 4 5% 8% 11% 46%	3098
August	1st to 10th	Night	1 1 1 1 1 2 2 3 6% 82%	2949
	11th to 20th	Night	3 3 1 4 2 3 3 4 7% 12% 59%	3113
	21st to end	Night	3 3 1 3 3 2 4 3 6% 12% 61%	3756
September	1st to 10th	Night	7% 6% 2 7% 4 4 4 4 7% 9% 47%	2090
	11th to 20th	Night	9% 6% 3 6% 4 4 4 3 6% 9% 48%	2090
	21st to end	Night	7% 4 2 4 3 3 3 3 4 9% 56%	2090
October	1st to 10th	Night	4 3 1 4 3 3 3 3 6% 6% 64%	2090
	11th to 20th	Night	11% 3 1 4 3 3 3 2 4 6% 60%	2190
	21st to end	Night	10% 4 1 4 2 2 3 2 3 4 65%	2508
November	1st to 10th	Night	11% 4 1 5% 3 3 3 3 6% 7% 53%	2244
	11th to 20th	Night	15% 5% 2 5% 3 3 2 2 4 6% 53%	2280
	21st to end	Night	17% 6% 2 5% 4 3 4 3 4 6% 45%	2468
December	1st to 10th	Night	19% 6% 2 5% 3 3 3 3 4 5% 45%	2470
	11th to 20th	Night	19% 9% 2 6% 4 3 4 3 5% 6% 40%	3036
	21st to end	Night	14% 8% 2 6% 3 3 3 3 5% 6% 45%	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	40% 4 6% 12% 22% 15%	2848
	11th to 20th	Day	34% 3 8% 19% 22% 14%	2850
	21st to end	Day	46% 4 6% 15% 20% 8%	3459
February	1st to 10th	Day	47% 5% 7% 9% 18% 14%	1900
	11th to 20th	Day	42% 4 9% 16% 17% 11%	1859
	21st to end	Day	42% 4 8% 17% 19% 11%	1592
March	1st to 10th	Day	48% 6% 10% 17% 13% 6%	3436
	11th to 20th	Day	57% 6% 8% 9% 13% 7%	3480
	21st to end	Day	29% 7% 11% 22% 17% 14%	3814
April	1st to 10th	Day	38% 7% 11% 16% 17% 11%	2090
	11th to 20th	Day	43% 6% 8% 18% 14% 12%	2066
	21st to end	Day	39% 7% 9% 19% 15% 11%	2273
May	1st to 10th	Day	42% 8% 15% 18% 10% 6%	4120
	11th to 20th	Day	36% 9% 12% 18% 17% 8%	4086
	21st to end	Day	28% 8% 12% 39% 12% 1	4489
June	1st to 10th	Day	26% 7% 16% 29% 19% 3	2470
	11th to 20th	Day	30% 7% 13% 26% 20% 4	2470
	21st to end	Day	37% 11% 16% 25% 10% 1	2470
July	1st to 10th	Day	33% 9% 22% 30% 6%	4056
	11th to 20th	Day	41% 10% 19% 21% 9%	4051
	21st to end	Day	38% 9% 22% 26% 4	4325
August	1st to 10th	Day	13% 6% 16% 45% 20%	3972
	11th to 20th	Day	21% 10% 31% 30% 7%	3762
	21st to end	Day	33% 11% 19% 26% 9% 1	3898
September	1st to 10th	Day	45% 11% 14% 14% 12% 4	2090
	11th to 20th	Day	41% 10% 15% 17% 14% 3	2090
	21st to end	Day	32% 9% 14% 19% 16% 10%	2090
October	1st to 10th	Day	30% 6% 12% 19% 24% 9%	2090
	11th to 20th	Day	33% 7% 11% 19% 17% 13%	1969
	21st to end	Day	28% 5% 8% 16% 25% 18%	2090
November	1st to 10th	Day	38% 6% 11% 17% 19% 9%	1868
	11th to 20th	Day	39% 5% 11% 15% 18% 12%	1899
	21st to end	Day	44% 5% 8% 15% 16% 11%	1710
December	1st to 10th	Day	42% 5% 9% 18% 18% 8%	1710
	11th to 20th	Day	43% 6% 8% 12% 17% 14%	2159
	21st to end	Day	40% 5% 7% 17% 21% 10%	3135
January	1st to 10th	Night	39% 4 8% 12% 16% 21%	4108
	11th to 20th	Night	31% 3 6% 20% 21% 19%	4120
	21st to end	Night	48% 4 7% 12% 20% 9%	4238
February	1st to 10th	Night	43% 5% 9% 12% 14% 16%	2280
	11th to 20th	Night	39% 5% 10% 16% 18% 12%	2218
	21st to end	Night	41% 4 8% 20% 16% 10%	1860
March	1st to 10th	Night	48% 7% 11% 16% 12% 6%	3419
	11th to 20th	Night	59% 6% 9% 10% 10% 7%	3480
	21st to end	Night	31% 4 14% 19% 21% 11%	3817
April	1st to 10th	Night	42% 7% 12% 17% 13% 9%	2090
	11th to 20th	Night	41% 6% 10% 16% 14% 13%	2063
	21st to end	Night	43% 7% 9% 17% 14% 9%	1898
May	1st to 10th	Night	48% 7% 12% 17% 10% 6%	2850
	11th to 20th	Night	40% 7% 14% 19% 15% 5%	2824
	21st to end	Night	35% 9% 15% 34% 7%	3099
June	1st to 10th	Night	19% 7% 20% 34% 18% 2	1710
	11th to 20th	Night	22% 7% 14% 35% 20% 2	1710
	21st to end	Night	26% 10% 21% 32% 10% 1	1710
July	1st to 10th	Night	22% 8% 28% 37% 4	2805
	11th to 20th	Night	32% 11% 27% 23% 8%	2796
	21st to end	Night	30% 10% 29% 26% 5%	2999
August	1st to 10th	Night	7% 4 19% 52% 19%	2939
	11th to 20th	Night	18% 7% 37% 34% 4	3143
	21st to end	Night	17% 12% 30% 31% 9% 1	3756
September	1st to 10th	Night	33% 9% 22% 20% 12% 4	2090
	11th to 20th	Night	33% 8% 16% 26% 13% 3	2090
	21st to end	Night	25% 7% 14% 27% 18% 8%	2090
October	1st to 10th	Night	20% 6% 14% 28% 21% 10%	2090
	11th to 20th	Night	27% 5% 11% 23% 21% 13%	2190
	21st to end	Night	25% 5% 7% 19% 26% 18%	2508
November	1st to 10th	Night	30% 7% 12% 20% 22% 9%	2244
	11th to 20th	Night	34% 5% 14% 18% 17% 12%	2280
	21st to end	Night	40% 5% 10% 20% 16% 9%	2468
December	1st to 10th	Night	40% 5% 10% 18% 17% 10%	2470
	11th to 20th	Night	45% 5% 6% 14% 14% 15%	3037
	21st to end	Night	39% 6% 9% 14% 19% 13%	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	20% 9% 33% 26% 10% 3	270
	11th to 20th	Day	22% 7% 31% 26% 13% 1	270
	21st to end	Day	22% 12% 36% 18% 11% 1	297
February	1st to 10th	Day	22% 13% 27% 24% 11% 3	270
	11th to 20th	Day	21% 13% 33% 25% 7%	270
	21st to end	Day	21% 12% 42% 19% 6%	225
March	1st to 10th	Day	21% 10% 37% 24% 9%	270
	11th to 20th	Day	19% 12% 40% 22% 6%	270
	21st to end	Day	13% 12% 42% 28% 4 1	297
April	1st to 10th	Day	13% 11% 41% 26% 8% 1	270
	11th to 20th	Day	16% 16% 37% 20% 11% 1	264
	21st to end	Day	14% 10% 40% 29% 7%	453
May	1st to 10th	Day	12% 11% 43% 25% 8%	653
	11th to 20th	Day	9% 7% 39% 31% 12% 2	675
	21st to end	Day	8% 6% 32% 38% 15% 1	734
June	1st to 10th	Day	6% 2 17% 40% 29% 6%	680
	11th to 20th	Day	6% 1 16% 44% 27% 5%	680
	21st to end	Day	8% 2 12% 39% 27% 12%	680
July	1st to 10th	Day	6% 2 10% 37% 35% 11%	671
	11th to 20th	Day	4 2 5% 38% 42% 10%	668
	21st to end	Day	6% 1 7% 37% 37% 13%	739
August	1st to 10th	Day	1 5% 40% 37% 17%	610
	11th to 20th	Day	3 7% 41% 33% 16%	477
	21st to end	Day	6% 1 5% 27% 33% 29%	375
September	1st to 10th	Day	10% 1 9% 21% 38% 21%	300
	11th to 20th	Day	8% 3 23% 43% 23%	300
	21st to end	Day	6% 7% 24% 40% 23%	300
October	1st to 10th	Day	7% 3 8% 30% 39% 14%	300
	11th to 20th	Day	12% 1 12% 31% 28% 15%	300
	21st to end	Day	12% 8% 22% 32% 18% 8%	330
November	1st to 10th	Day	16% 4 16% 31% 29% 5%	273
	11th to 20th	Day	21% 5% 17% 28% 26% 3	270
	21st to end	Day	23% 12% 26% 23% 13% 4	270
December	1st to 10th	Day	19% 4 20% 34% 16% 7%	270
	11th to 20th	Day	19% 15% 26% 25% 12% 3	270
	21st to end	Day	18% 10% 30% 29% 11% 2	297
January	1st to 10th	Night	22% 7% 27% 32% 10% 1	950
	11th to 20th	Night	21% 7% 29% 34% 8%	950
	21st to end	Night	22% 8% 28% 35% 8%	868
February	1st to 10th	Night	22% 10% 31% 31% 5%	760
	11th to 20th	Night	25% 8% 31% 32% 5%	744
	21st to end	Night	23% 10% 39% 24% 4	604
March	1st to 10th	Night	23% 9% 32% 31% 5% 1	570
	11th to 20th	Night	21% 7% 36% 31% 4	570
	21st to end	Night	16% 8% 40% 31% 5%	627
April	1st to 10th	Night	15% 8% 42% 31% 5%	570
	11th to 20th	Night	21% 8% 36% 29% 7%	563
	21st to end	Night	18% 8% 42% 26% 6%	570
May	1st to 10th	Night	16% 6% 42% 32% 4	570
	11th to 20th	Night	15% 3 35% 39% 9% 1	561
	21st to end	Night	10% 3 32% 41% 14%	617
June	1st to 10th	Night	4 2 16% 52% 24% 1	570
	11th to 20th	Night	5% 1 19% 56% 18% 1	570
	21st to end	Night	5% 1 16% 46% 29% 3	570
July	1st to 10th	Night	6% 1 9% 50% 32% 2	555
	11th to 20th	Night	3 1 6% 48% 40% 2	552
	21st to end	Night	3 2 7% 48% 39% 2	624
August	1st to 10th	Night	1 4 49% 43% 4	567
	11th to 20th	Night	5% 1 4 46% 40% 3	564
	21st to end	Night	4 1 4 32% 52% 7%	627
September	1st to 10th	Night	8% 1 5% 36% 44% 7%	570
	11th to 20th	Night	9% 1 4 29% 49% 7%	570
	21st to end	Night	9% 1 7% 33% 45% 5%	570
October	1st to 10th	Night	4 1 7% 37% 48% 3	570
	11th to 20th	Night	12% 1 16% 44% 24% 2	670
	21st to end	Night	9% 5% 23% 39% 22% 1	836
November	1st to 10th	Night	12% 4 17% 41% 24% 1	748
	11th to 20th	Night	16% 4 24% 36% 19% 1	760
	21st to end	Night	19% 6% 24% 34% 16% 1	948
December	1st to 10th	Night	20% 5% 22% 38% 13% 2	950
	11th to 20th	Night	24% 7% 27% 33% 9%	950
	21st to end	Night	19% 7% 29% 35% 9% 1	1045

Page generated at 2024-10-30 12:19:21. Version ac07

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