Wolf Creek Estates Observatory
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wolf Creek Estates Observatory 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	3 3 1 4 3 4 4 4 6% 8% 59%	100561
	Night	2 3 1 3 3 3 3 3 6% 8% 64%	98651
Transparency	Day	22% 8% 8% 18% 27% 18%	100325
	Night	18% 8% 8% 19% 29% 18%	98477
Seeing	Day	11% 18% 27% 25% 15% 4	14835
	Night	8% 14% 25% 31% 19% 3	24988

By Month

Percentage Cloud Cover SW (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	1 2 1 3 3 3 5% 5% 7% 8% 61%	2858
	11th to 20th	Day	1 2 1 2 2 2 2 2 4 7% 75%	2860
	21st to end	Day	3 5% 2 5% 4 5% 5% 5% 6% 8% 51%	3146
February	1st to 10th	Day	1 4 1 4 3 3 4 3 5% 6% 67%	1844
	11th to 20th	Day	2 4 1 3 3 3 3 3 5% 6% 67%	1849
	21st to end	Day	3 1 2 2 3 3 4 5% 5% 72%	1570
March	1st to 10th	Day	1 6% 2 4 3 3 4 3 6% 7% 61%	3278
	11th to 20th	Day	2 11% 2 5% 4 4 4 3 6% 6% 53%	3490
	21st to end	Day	1 3 2 3 2 3 3 3 6% 11% 63%	3974
April	1st to 10th	Day	2 2 1 2 2 3 3 3 5% 7% 70%	2280
	11th to 20th	Day	3 3 1 3 2 3 4 4 4 5% 69%	2251
	21st to end	Day	2 2 1 2 2 2 3 2 4 6% 73%	2280
May	1st to 10th	Day	1 1 1 2 2 2 2 2 4 5% 80%	3800
	11th to 20th	Day	2 3 1 4 3 4 4 3 5% 7% 64%	3765
	21st to end	Day	1 1 2 1 2 2 2 3 7% 78%	4561
June	1st to 10th	Day	2 2 1 3 3 4 5% 4 7% 9% 60%	2660
	11th to 20th	Day	2 2 1 3 2 3 3 3 5% 7% 70%	2660
	21st to end	Day	7% 4 1 5% 5% 4 5% 5% 7% 8% 47%	2660
July	1st to 10th	Day	6% 4 2 5% 4 5% 7% 6% 9% 12% 42%	4145
	11th to 20th	Day	4 3 1 5% 4 6% 7% 7% 9% 11% 43%	4110
	21st to end	Day	8% 5% 2 6% 6% 7% 8% 7% 9% 11% 32%	4454
August	1st to 10th	Day	4 3 1 6% 4 7% 7% 7% 9% 11% 41%	3794
	11th to 20th	Day	5% 3 1 5% 4 6% 6% 6% 8% 8% 47%	3726
	21st to end	Day	7% 4 1 6% 6% 7% 7% 6% 9% 11% 36%	4180
September	1st to 10th	Day	8% 6% 3 7% 4 5% 6% 4 5% 8% 44%	2280
	11th to 20th	Day	8% 5% 2 5% 4 4 4 4 5% 7% 53%	2275
	21st to end	Day	4 3 1 4 3 3 4 3 4 6% 66%	2090
October	1st to 10th	Day	6% 4 2 4 3 3 3 3 5% 6% 61%	1912
	11th to 20th	Day	4 3 1 3 2 3 3 2 3 4 72%	1900
	21st to end	Day	2 2 1 2 2 2 2 2 3 5% 78%	2090
November	1st to 10th	Day	3 2 2 2 2 2 3 3 6% 74%	1863
	11th to 20th	Day	1 2 1 3 2 2 2 2 5% 6% 72%	1710
	21st to end	Day	3 5% 1 3 2 3 4 4 5% 6% 65%	1710
December	1st to 10th	Day	2 3 1 2 2 3 4 3 6% 8% 65%	1710
	11th to 20th	Day	1 4 2 5% 3 4 4 4 6% 8% 59%	1936
	21st to end	Day	1 3 1 3 2 2 3 3 4 7% 71%	2890
January	1st to 10th	Night	1 3 2 4 3 3 4 4 5% 7% 66%	4097
	11th to 20th	Night	1 2 1 3 2 3 3 3 5% 5% 73%	4110
	21st to end	Night	2 4 2 4 3 3 4 4 8% 12% 54%	4521
February	1st to 10th	Night	1 2 1 3 3 3 2 3 6% 8% 69%	2333
	11th to 20th	Night	1 3 1 3 2 2 3 3 4 7% 70%	2218
	21st to end	Night	1 2 1 2 2 2 3 4 5% 7% 71%	1884
March	1st to 10th	Night	1 3 2 3 2 2 3 3 5% 7% 70%	3588
	11th to 20th	Night	4 14% 2 3 3 2 3 2 4 5% 57%	3490
	21st to end	Night	1 1 2 2 2 3 2 5% 9% 72%	3672
April	1st to 10th	Night	1 2 1 3 2 3 3 3 5% 6% 71%	1900
	11th to 20th	Night	2 3 1 1 2 2 3 3 5% 7% 71%	1877
	21st to end	Night	2 3 1 2 2 2 3 3 5% 6% 72%	1900
May	1st to 10th	Night	1 2 1 2 2 1 2 2 4 5% 79%	3170
	11th to 20th	Night	2 3 1 2 2 2 3 3 5% 7% 69%	3140
	21st to end	Night	1 1 1 2 2 2 2 3 4 82%	3016
June	1st to 10th	Night	3 3 2 4 4 4 4 4 8% 9% 56%	1520
	11th to 20th	Night	2 2 1 2 2 2 3 3 6% 7% 70%	1520
	21st to end	Night	6% 4 2 5% 5% 5% 5% 5% 6% 8% 50%	1520
July	1st to 10th	Night	6% 4 1 4 4 4 4 5% 9% 12% 48%	2818
	11th to 20th	Night	3 2 1 5% 5% 5% 5% 5% 7% 10% 51%	2860
	21st to end	Night	8% 6% 2 5% 4 5% 6% 4 9% 14% 38%	3109
August	1st to 10th	Night	3 3 1 4 3 4 5% 5% 9% 15% 49%	3143
	11th to 20th	Night	3 2 1 3 3 4 4 4 7% 12% 57%	3113
	21st to end	Night	4 3 2 5% 4 5% 6% 5% 9% 14% 43%	3487
September	1st to 10th	Night	7% 3 1 4 4 4 5% 4 7% 8% 51%	1900
	11th to 20th	Night	6% 3 2 4 2 3 3 3 5% 8% 61%	1903
	21st to end	Night	3 3 1 3 3 3 3 3 4 7% 68%	2090
October	1st to 10th	Night	4 3 1 4 3 3 3 3 5% 6% 65%	2264
	11th to 20th	Night	2 3 1 3 1 2 3 2 4 4 76%	2280
	21st to end	Night	3 2 1 3 2 2 2 3 4 5% 74%	2508
November	1st to 10th	Night	3 2 1 2 2 2 2 3 4 7% 72%	2244
	11th to 20th	Night	1 2 3 2 3 4 2 5% 7% 73%	2455
	21st to end	Night	2 5% 1 3 3 2 2 2 6% 7% 66%	2470
December	1st to 10th	Night	2 3 1 3 2 2 3 3 5% 9% 66%	2470
	11th to 20th	Night	1 3 1 4 3 3 4 4 5% 7% 63%	3256
	21st to end	Night	1 3 2 4 3 3 3 3 5% 6% 69%	4805

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	16% 14% 4 15% 38% 12%	2859
	11th to 20th	Day	10% 9% 7% 22% 39% 13%	2860
	21st to end	Day	27% 13% 4 14% 28% 13%	3146
February	1st to 10th	Day	19% 6% 6% 19% 27% 24%	1844
	11th to 20th	Day	19% 7% 5% 18% 28% 23%	1859
	21st to end	Day	14% 8% 3 12% 32% 31%	1570
March	1st to 10th	Day	21% 7% 4 12% 32% 24%	3278
	11th to 20th	Day	30% 7% 5% 15% 30% 13%	3490
	21st to end	Day	15% 9% 5% 22% 33% 15%	3974
April	1st to 10th	Day	15% 6% 4 15% 36% 25%	2280
	11th to 20th	Day	17% 5% 4 13% 30% 30%	2254
	21st to end	Day	13% 6% 4 18% 36% 23%	2280
May	1st to 10th	Day	9% 4 4 11% 37% 35%	3800
	11th to 20th	Day	20% 6% 6% 13% 34% 21%	3768
	21st to end	Day	9% 4 4 11% 21% 51%	4561
June	1st to 10th	Day	18% 7% 13% 19% 24% 19%	2660
	11th to 20th	Day	14% 5% 5% 15% 25% 36%	2660
	21st to end	Day	31% 8% 12% 17% 19% 13%	2660
July	1st to 10th	Day	29% 13% 19% 15% 14% 10%	4081
	11th to 20th	Day	29% 11% 15% 21% 21% 3	4041
	21st to end	Day	36% 14% 19% 22% 9% 1	4314
August	1st to 10th	Day	29% 12% 15% 26% 16% 2	3781
	11th to 20th	Day	29% 10% 13% 21% 24% 2	3762
	21st to end	Day	36% 12% 17% 24% 9% 2	4179
September	1st to 10th	Day	37% 9% 9% 16% 20% 8%	2280
	11th to 20th	Day	31% 7% 8% 19% 25% 11%	2275
	21st to end	Day	20% 6% 6% 21% 32% 15%	2090
October	1st to 10th	Day	24% 7% 7% 17% 25% 20%	1912
	11th to 20th	Day	18% 5% 4 14% 32% 28%	1900
	21st to end	Day	12% 4 4 21% 37% 21%	2090
November	1st to 10th	Day	13% 5% 4 21% 36% 21%	1863
	11th to 20th	Day	14% 6% 6% 21% 31% 22%	1710
	21st to end	Day	20% 7% 5% 18% 29% 21%	1710
December	1st to 10th	Day	17% 8% 5% 25% 31% 14%	1710
	11th to 20th	Day	21% 10% 8% 15% 31% 15%	1934
	21st to end	Day	15% 7% 7% 16% 28% 27%	2890
January	1st to 10th	Night	16% 12% 4 17% 34% 16%	4097
	11th to 20th	Night	13% 8% 5% 21% 39% 14%	4110
	21st to end	Night	22% 14% 5% 17% 28% 13%	4521
February	1st to 10th	Night	14% 7% 7% 20% 27% 25%	2333
	11th to 20th	Night	16% 8% 4 19% 29% 24%	2218
	21st to end	Night	13% 8% 4 16% 30% 29%	1884
March	1st to 10th	Night	15% 8% 4 14% 38% 21%	3588
	11th to 20th	Night	31% 7% 4 15% 29% 14%	3490
	21st to end	Night	9% 10% 6% 26% 35% 14%	3672
April	1st to 10th	Night	14% 6% 4 16% 37% 23%	1900
	11th to 20th	Night	14% 6% 6% 14% 30% 29%	1877
	21st to end	Night	13% 6% 5% 19% 37% 20%	1900
May	1st to 10th	Night	9% 3 2 9% 39% 37%	3170
	11th to 20th	Night	15% 6% 7% 16% 34% 22%	3141
	21st to end	Night	7% 4 4 11% 19% 55%	3017
June	1st to 10th	Night	22% 8% 10% 18% 21% 21%	1520
	11th to 20th	Night	12% 4 5% 20% 19% 39%	1520
	21st to end	Night	30% 9% 12% 17% 15% 17%	1520
July	1st to 10th	Night	24% 10% 19% 19% 17% 9%	2773
	11th to 20th	Night	25% 9% 14% 28% 21% 3	2806
	21st to end	Night	32% 10% 21% 26% 10% 1	3011
August	1st to 10th	Night	21% 9% 19% 31% 18% 3	3133
	11th to 20th	Night	18% 8% 14% 30% 29% 2	3143
	21st to end	Night	27% 11% 21% 25% 15% 1	3487
September	1st to 10th	Night	28% 8% 13% 20% 22% 10%	1900
	11th to 20th	Night	23% 6% 11% 19% 27% 13%	1903
	21st to end	Night	17% 5% 9% 22% 33% 13%	2090
October	1st to 10th	Night	20% 6% 9% 20% 26% 19%	2264
	11th to 20th	Night	14% 5% 4 14% 31% 32%	2280
	21st to end	Night	14% 4 5% 18% 35% 24%	2508
November	1st to 10th	Night	13% 5% 5% 19% 35% 23%	2244
	11th to 20th	Night	12% 6% 5% 21% 33% 24%	2455
	21st to end	Night	19% 7% 6% 15% 33% 20%	2470
December	1st to 10th	Night	19% 7% 7% 22% 27% 18%	2470
	11th to 20th	Night	19% 9% 8% 17% 27% 19%	3257
	21st to end	Night	17% 9% 5% 16% 31% 23%	4805

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	15% 30% 31% 21% 3	270
	11th to 20th	Day	22% 22% 29% 21% 4 1	270
	21st to end	Day	15% 26% 32% 18% 9%	297
February	1st to 10th	Day	17% 33% 26% 19% 6%	270
	11th to 20th	Day	21% 30% 31% 13% 4	270
	21st to end	Day	32% 35% 19% 11% 4	225
March	1st to 10th	Day	18% 33% 33% 12% 5%	353
	11th to 20th	Day	20% 30% 31% 13% 5% 1	460
	21st to end	Day	25% 32% 32% 8% 3	506
April	1st to 10th	Day	15% 34% 35% 12% 3 1	460
	11th to 20th	Day	19% 37% 31% 11% 2	452
	21st to end	Day	16% 34% 34% 13% 3	460
May	1st to 10th	Day	8% 30% 47% 13% 3	463
	11th to 20th	Day	10% 22% 39% 21% 8%	488
	21st to end	Day	6% 23% 39% 24% 7% 1	670
June	1st to 10th	Day	4 9% 29% 37% 19% 3	680
	11th to 20th	Day	4 10% 29% 35% 20% 2	680
	21st to end	Day	8% 7% 20% 35% 26% 5%	680
July	1st to 10th	Day	5% 1 19% 43% 27% 6%	508
	11th to 20th	Day	5% 11% 37% 36% 11%	484
	21st to end	Day	5% 1 9% 34% 36% 14%	531
August	1st to 10th	Day	7% 2 10% 34% 37% 11%	487
	11th to 20th	Day	8% 3 14% 37% 29% 9%	477
	21st to end	Day	9% 3 12% 36% 31% 9%	539
September	1st to 10th	Day	8% 4 18% 40% 25% 6%	490
	11th to 20th	Day	6% 2 31% 38% 20% 5%	485
	21st to end	Day	3 7% 35% 27% 22% 5%	300
October	1st to 10th	Day	10% 11% 30% 29% 15% 5%	300
	11th to 20th	Day	11% 15% 31% 26% 14% 3	300
	21st to end	Day	14% 19% 27% 22% 14% 5%	330
November	1st to 10th	Day	14% 27% 28% 19% 8% 4	273
	11th to 20th	Day	9% 20% 27% 26% 16% 3	270
	21st to end	Day	15% 31% 26% 19% 8% 1	270
December	1st to 10th	Day	19% 22% 30% 21% 9%	270
	11th to 20th	Day	14% 32% 26% 23% 5%	270
	21st to end	Day	26% 29% 26% 15% 5%	297
January	1st to 10th	Night	9% 18% 28% 30% 13% 2	760
	11th to 20th	Night	10% 21% 31% 27% 10% 2	760
	21st to end	Night	11% 20% 29% 28% 12% 1	836
February	1st to 10th	Night	10% 21% 30% 28% 9% 2	760
	11th to 20th	Night	10% 24% 37% 23% 5% 1	744
	21st to end	Night	14% 30% 33% 18% 4 1	628
March	1st to 10th	Night	14% 24% 27% 27% 7% 1	760
	11th to 20th	Night	12% 19% 28% 27% 13%	760
	21st to end	Night	11% 23% 35% 25% 6%	744
April	1st to 10th	Night	10% 25% 37% 22% 5%	570
	11th to 20th	Night	9% 28% 31% 25% 7%	563
	21st to end	Night	7% 26% 33% 27% 6%	570
May	1st to 10th	Night	4 19% 41% 31% 5%	570
	11th to 20th	Night	5% 15% 28% 35% 16% 1	561
	21st to end	Night	4 13% 35% 36% 12%	617
June	1st to 10th	Night	4 7% 28% 42% 18% 1	570
	11th to 20th	Night	3 6% 29% 45% 15% 1	570
	21st to end	Night	6% 4 16% 39% 31% 3	570
July	1st to 10th	Night	6% 1 12% 38% 38% 4	555
	11th to 20th	Night	4 1 5% 34% 48% 8%	552
	21st to end	Night	4 1 8% 27% 49% 11%	624
August	1st to 10th	Night	3 1 4 27% 52% 12%	567
	11th to 20th	Night	4 2 9% 30% 46% 10%	564
	21st to end	Night	3 2 9% 26% 50% 10%	627
September	1st to 10th	Night	7% 1 8% 35% 43% 6%	570
	11th to 20th	Night	7% 1 14% 40% 35% 3	570
	21st to end	Night	6% 3 17% 42% 29% 4	570
October	1st to 10th	Night	5% 9% 21% 39% 25% 3	744
	11th to 20th	Night	5% 8% 28% 39% 17% 3	760
	21st to end	Night	9% 14% 22% 29% 21% 6%	836
November	1st to 10th	Night	6% 14% 23% 35% 19% 4	748
	11th to 20th	Night	5% 14% 27% 36% 15% 3	935
	21st to end	Night	11% 18% 25% 26% 17% 2	950
December	1st to 10th	Night	12% 18% 27% 31% 11% 2	950
	11th to 20th	Night	13% 22% 31% 27% 7% 1	950
	21st to end	Night	14% 20% 32% 25% 7% 1	1003

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