Wolf Creek State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wolf Creek State Park clear sky chart from 2005-11-06 to 2024-12-09.

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% 8% 3 7% 5% 4 4 4 6% 8% 39%	101501
	Night	14% 9% 3 7% 4 4 4 3 5% 7% 41%	98316
Transparency	Day	41% 6% 12% 24% 15% 2	105105
	Night	41% 5% 11% 23% 17% 2	102853
Seeing	Day	16% 7% 26% 26% 18% 7%	15759
	Night	18% 8% 28% 31% 14% 2	25607

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% 13% 7% 12% 5% 5% 5% 4 5% 6% 26%	2527
	11th to 20th	Day	14% 11% 5% 11% 7% 9% 8% 5% 6% 4 19%	2530
	21st to end	Day	23% 20% 5% 9% 4 4 3 3 4 5% 20%	3075
February	1st to 10th	Day	16% 12% 4 11% 6% 5% 4 4 5% 7% 28%	1786
	11th to 20th	Day	15% 10% 4 8% 7% 5% 4 4 5% 8% 31%	1848
	21st to end	Day	17% 13% 4 8% 5% 3 4 3 5% 6% 32%	1570
March	1st to 10th	Day	19% 17% 4 7% 4 3 3 3 3 5% 34%	3120
	11th to 20th	Day	11% 9% 3 6% 3 3 3 3 6% 7% 45%	3304
	21st to end	Day	16% 11% 4 8% 6% 5% 5% 3 5% 7% 30%	4161
April	1st to 10th	Day	14% 8% 3 7% 4 4 5% 4 6% 8% 37%	2280
	11th to 20th	Day	16% 9% 3 6% 4 4 4 3 4 6% 41%	2254
	21st to end	Day	19% 8% 2 7% 4 5% 4 3 5% 6% 37%	2287
May	1st to 10th	Day	15% 8% 2 7% 6% 6% 5% 5% 7% 11% 29%	4082
	11th to 20th	Day	17% 8% 2 6% 4 4 4 4 5% 8% 37%	4174
	21st to end	Day	9% 6% 2 6% 4 4 5% 4 7% 9% 44%	4824
June	1st to 10th	Day	8% 5% 2 5% 5% 5% 5% 4 7% 9% 45%	2660
	11th to 20th	Day	8% 4 1 5% 5% 4 4 4 7% 9% 48%	2660
	21st to end	Day	7% 5% 2 6% 5% 4 5% 5% 8% 10% 42%	2660
July	1st to 10th	Day	12% 5% 2 6% 5% 4 5% 4 7% 9% 39%	4440
	11th to 20th	Day	5% 5% 2 6% 4 5% 5% 6% 7% 12% 44%	4440
	21st to end	Day	8% 5% 2 7% 5% 5% 6% 5% 8% 11% 37%	4813
August	1st to 10th	Day	9% 4 1 4 3 4 4 3 6% 10% 53%	4012
	11th to 20th	Day	9% 5% 2 6% 5% 5% 6% 5% 7% 10% 40%	3729
	21st to end	Day	5% 4 2 5% 5% 4 5% 4 7% 10% 50%	4180
September	1st to 10th	Day	11% 5% 2 7% 4 4 4 3 5% 7% 47%	2280
	11th to 20th	Day	9% 4 2 6% 4 5% 5% 4 5% 7% 49%	2176
	21st to end	Day	10% 5% 2 5% 4 5% 3 3 5% 8% 51%	2090
October	1st to 10th	Day	11% 4 1 5% 4 3 3 4 5% 8% 52%	2028
	11th to 20th	Day	15% 7% 1 6% 3 3 4 3 5% 6% 46%	1900
	21st to end	Day	18% 8% 3 7% 3 3 3 3 5% 6% 41%	1944
November	1st to 10th	Day	11% 7% 2 5% 3 3 3 2 5% 7% 52%	1762
	11th to 20th	Day	17% 9% 2 7% 4 3 3 3 5% 7% 41%	1800
	21st to end	Day	16% 11% 4 8% 5% 3 4 3 5% 5% 38%	1800
December	1st to 10th	Day	15% 13% 5% 6% 5% 5% 4 3 5% 6% 33%	1604
	11th to 20th	Day	15% 13% 5% 11% 5% 4 4 4 6% 7% 28%	1918
	21st to end	Day	23% 17% 5% 13% 4 4 4 3 4 4 18%	2783
January	1st to 10th	Night	15% 13% 6% 10% 5% 4 4 3 4 6% 30%	4428
	11th to 20th	Night	14% 17% 6% 11% 5% 5% 8% 3 4 3 24%	4440
	21st to end	Night	25% 14% 7% 9% 4 3 4 2 3 7% 22%	4591
February	1st to 10th	Night	17% 12% 5% 9% 5% 4 3 3 4 6% 31%	2392
	11th to 20th	Night	15% 8% 4 8% 5% 4 4 3 5% 6% 37%	2218
	21st to end	Night	19% 10% 3 7% 3 3 4 3 4 6% 37%	1884
March	1st to 10th	Night	19% 16% 3 6% 4 3 3 3 4 5% 35%	3733
	11th to 20th	Night	13% 6% 2 5% 4 3 4 3 4 6% 50%	3686
	21st to end	Night	18% 9% 3 8% 5% 4 4 4 5% 6% 34%	3468
April	1st to 10th	Night	13% 7% 3 7% 4 4 4 3 4 6% 44%	1900
	11th to 20th	Night	16% 9% 2 5% 4 3 3 3 4 6% 46%	1875
	21st to end	Night	19% 7% 2 7% 4 5% 4 3 5% 5% 37%	1891
May	1st to 10th	Night	17% 10% 3 8% 4 4 4 4 6% 8% 34%	2813
	11th to 20th	Night	16% 7% 2 6% 4 4 4 3 5% 7% 41%	2708
	21st to end	Night	9% 6% 2 7% 5% 5% 4 4 6% 9% 42%	2743
June	1st to 10th	Night	8% 5% 2 6% 4 3 4 4 6% 9% 48%	1520
	11th to 20th	Night	7% 4 2 6% 4 4 4 4 6% 8% 53%	1520
	21st to end	Night	6% 6% 2 6% 5% 4 4 4 7% 10% 46%	1520
July	1st to 10th	Night	11% 5% 2 5% 4 4 4 4 5% 10% 46%	2530
	11th to 20th	Night	4 4 2 4 3 3 3 4 7% 8% 57%	2530
	21st to end	Night	7% 8% 2 7% 4 5% 5% 4 8% 11% 40%	2750
August	1st to 10th	Night	6% 4 2 5% 3 3 4 4 6% 9% 55%	2890
	11th to 20th	Night	7% 5% 2 5% 3 5% 4 5% 7% 8% 49%	3100
	21st to end	Night	5% 3 1 3 4 4 4 4 7% 9% 57%	3476
September	1st to 10th	Night	11% 5% 2 4 4 2 4 2 5% 7% 54%	1900
	11th to 20th	Night	7% 5% 1 5% 4 4 4 3 6% 9% 53%	1985
	21st to end	Night	10% 6% 2 5% 3 3 4 4 4 7% 52%	2090
October	1st to 10th	Night	10% 3 2 5% 4 3 3 3 5% 6% 56%	2150
	11th to 20th	Night	14% 6% 2 4 3 3 4 2 4 6% 52%	2280
	21st to end	Night	17% 9% 3 5% 3 3 4 3 6% 5% 42%	2652
November	1st to 10th	Night	10% 6% 2 5% 3 4 4 3 5% 5% 53%	2536
	11th to 20th	Night	13% 8% 3 6% 4 3 4 3 5% 6% 45%	2600
	21st to end	Night	18% 9% 4 7% 4 3 3 3 4 6% 39%	2600
December	1st to 10th	Night	16% 9% 3 8% 6% 4 4 3 4 7% 34%	2754
	11th to 20th	Night	17% 10% 4 9% 5% 4 3 3 4 5% 38%	3279
	21st to end	Night	25% 17% 5% 9% 5% 5% 4 3 3 4 19%	4884

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	55% 7% 9% 21% 8%	2528
	11th to 20th	Day	59% 10% 12% 13% 5%	2530
	21st to end	Day	65% 5% 8% 15% 6%	3075
February	1st to 10th	Day	54% 6% 12% 18% 9% 1	1786
	11th to 20th	Day	51% 6% 11% 21% 11% 1	1858
	21st to end	Day	52% 5% 8% 22% 9% 3	1570
March	1st to 10th	Day	55% 4 7% 19% 13% 2	3120
	11th to 20th	Day	36% 7% 14% 25% 18% 1	3304
	21st to end	Day	50% 9% 12% 23% 5%	4161
April	1st to 10th	Day	43% 6% 13% 23% 14% 1	2280
	11th to 20th	Day	45% 5% 11% 24% 12% 3	2254
	21st to end	Day	47% 6% 12% 22% 11% 3	2287
May	1st to 10th	Day	44% 10% 16% 23% 7%	4120
	11th to 20th	Day	44% 7% 12% 26% 10%	4178
	21st to end	Day	33% 8% 14% 21% 22% 2	4837
June	1st to 10th	Day	32% 9% 14% 26% 15% 4	2660
	11th to 20th	Day	31% 7% 12% 25% 22% 3	2660
	21st to end	Day	33% 8% 16% 23% 16% 3	2660
July	1st to 10th	Day	38% 7% 11% 28% 14% 2	4371
	11th to 20th	Day	31% 8% 14% 29% 18% 1	4365
	21st to end	Day	37% 8% 19% 23% 12% 1	4662
August	1st to 10th	Day	27% 6% 15% 37% 15% 1	3997
	11th to 20th	Day	36% 7% 14% 27% 15% 1	3765
	21st to end	Day	27% 7% 16% 32% 14% 4	4179
September	1st to 10th	Day	36% 6% 10% 24% 20% 4	2280
	11th to 20th	Day	33% 5% 10% 24% 24% 3	2176
	21st to end	Day	32% 5% 10% 27% 24% 3	2090
October	1st to 10th	Day	21% 3 9% 23% 40% 4	3366
	11th to 20th	Day	27% 3 8% 23% 35% 3	3140
	21st to end	Day	37% 3 8% 24% 26% 2	3182
November	1st to 10th	Day	33% 4 13% 27% 19% 4	1762
	11th to 20th	Day	43% 4 9% 23% 16% 5%	1800
	21st to end	Day	49% 4 10% 23% 13% 1	1800
December	1st to 10th	Day	50% 7% 13% 19% 11% 1	1604
	11th to 20th	Day	53% 6% 9% 24% 6% 1	1915
	21st to end	Day	68% 6% 9% 11% 5%	2783
January	1st to 10th	Night	54% 6% 12% 19% 8%	4428
	11th to 20th	Night	64% 4 9% 16% 7%	4440
	21st to end	Night	64% 4 9% 16% 7%	4591
February	1st to 10th	Night	54% 4 12% 18% 10% 2	2392
	11th to 20th	Night	47% 5% 9% 22% 15% 2	2219
	21st to end	Night	50% 4 10% 23% 11% 3	1884
March	1st to 10th	Night	51% 6% 9% 21% 12% 1	3733
	11th to 20th	Night	35% 7% 10% 25% 21% 2	3686
	21st to end	Night	48% 8% 11% 25% 7% 1	3468
April	1st to 10th	Night	41% 5% 11% 24% 17% 2	1900
	11th to 20th	Night	40% 4 10% 24% 18% 4	1875
	21st to end	Night	47% 6% 11% 20% 14% 3	1891
May	1st to 10th	Night	45% 8% 17% 20% 8% 1	2840
	11th to 20th	Night	41% 8% 13% 27% 11% 1	2709
	21st to end	Night	36% 8% 14% 21% 19% 3	2751
June	1st to 10th	Night	31% 7% 12% 26% 19% 4	1520
	11th to 20th	Night	28% 6% 11% 26% 23% 5%	1520
	21st to end	Night	31% 8% 15% 24% 17% 6%	1520
July	1st to 10th	Night	35% 5% 12% 25% 19% 4	2490
	11th to 20th	Night	23% 6% 13% 34% 22% 3	2482
	21st to end	Night	36% 8% 16% 21% 17% 2	2662
August	1st to 10th	Night	24% 7% 15% 37% 16% 1	2881
	11th to 20th	Night	31% 7% 13% 29% 19% 1	3130
	21st to end	Night	22% 7% 15% 33% 18% 4	3476
September	1st to 10th	Night	30% 5% 9% 27% 22% 7%	1900
	11th to 20th	Night	28% 5% 10% 27% 26% 5%	1985
	21st to end	Night	31% 5% 9% 24% 26% 4	2090
October	1st to 10th	Night	19% 4 7% 23% 44% 4	3592
	11th to 20th	Night	24% 2 8% 26% 37% 4	3779
	21st to end	Night	33% 4 8% 25% 24% 6%	4364
November	1st to 10th	Night	34% 4 10% 25% 21% 6%	2536
	11th to 20th	Night	39% 5% 9% 25% 20% 3	2600
	21st to end	Night	47% 4 10% 23% 15% 1	2600
December	1st to 10th	Night	49% 5% 12% 21% 12% 1	2754
	11th to 20th	Night	48% 5% 11% 22% 13% 1	3281
	21st to end	Night	68% 6% 8% 12% 6% 1	4884

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	22% 14% 34% 22% 7% 1	270
	11th to 20th	Day	27% 14% 35% 20% 4	270
	21st to end	Day	21% 15% 40% 19% 5%	297
February	1st to 10th	Day	27% 15% 36% 19% 4	270
	11th to 20th	Day	23% 17% 36% 18% 4 1	270
	21st to end	Day	28% 12% 40% 18% 3	225
March	1st to 10th	Day	21% 18% 36% 20% 4	270
	11th to 20th	Day	27% 16% 37% 17% 4	270
	21st to end	Day	29% 11% 36% 17% 7% 1	502
April	1st to 10th	Day	18% 13% 35% 24% 8% 2	460
	11th to 20th	Day	22% 14% 29% 20% 12% 2	452
	21st to end	Day	25% 9% 36% 20% 8% 2	460
May	1st to 10th	Day	18% 10% 32% 28% 10% 3	463
	11th to 20th	Day	18% 7% 25% 29% 17% 5%	541
	21st to end	Day	12% 3 30% 30% 17% 8%	734
June	1st to 10th	Day	9% 5% 22% 31% 25% 8%	680
	11th to 20th	Day	9% 4 23% 34% 23% 7%	680
	21st to end	Day	9% 4 27% 32% 21% 7%	680
July	1st to 10th	Day	13% 2 12% 29% 26% 18%	671
	11th to 20th	Day	7% 2 15% 35% 28% 13%	668
	21st to end	Day	10% 1 15% 32% 33% 10%	739
August	1st to 10th	Day	9% 2 13% 32% 31% 12%	580
	11th to 20th	Day	10% 3 18% 28% 27% 14%	479
	21st to end	Day	7% 2 10% 31% 37% 13%	539
September	1st to 10th	Day	12% 2 16% 31% 29% 10%	490
	11th to 20th	Day	9% 1 10% 31% 34% 14%	490
	21st to end	Day	13% 5% 25% 22% 23% 11%	490
October	1st to 10th	Day	12% 4 25% 32% 20% 7%	428
	11th to 20th	Day	17% 14% 33% 24% 10% 3	300
	21st to end	Day	27% 12% 31% 25% 5%	330
November	1st to 10th	Day	16% 9% 32% 25% 13% 4	300
	11th to 20th	Day	22% 13% 34% 22% 7% 2	300
	21st to end	Day	23% 12% 33% 23% 9%	300
December	1st to 10th	Day	16% 13% 41% 21% 5% 3	294
	11th to 20th	Day	21% 11% 38% 23% 7% 1	270
	21st to end	Day	28% 19% 33% 14% 6%	297
January	1st to 10th	Night	20% 13% 36% 26% 5%	950
	11th to 20th	Night	22% 14% 37% 22% 5%	950
	21st to end	Night	22% 13% 37% 25% 3	1045
February	1st to 10th	Night	24% 12% 35% 26% 2	872
	11th to 20th	Night	19% 15% 38% 25% 3	743
	21st to end	Night	25% 14% 35% 24% 2	628
March	1st to 10th	Night	23% 11% 35% 26% 4	760
	11th to 20th	Night	21% 11% 36% 27% 5%	698
	21st to end	Night	25% 9% 33% 26% 7%	627
April	1st to 10th	Night	17% 14% 33% 30% 5%	570
	11th to 20th	Night	19% 9% 32% 29% 11%	563
	21st to end	Night	24% 5% 35% 27% 7% 1	570
May	1st to 10th	Night	20% 6% 31% 34% 8% 1	570
	11th to 20th	Night	17% 5% 24% 38% 15% 2	561
	21st to end	Night	12% 3 24% 37% 21% 3	617
June	1st to 10th	Night	10% 3 20% 41% 25% 1	570
	11th to 20th	Night	10% 1 21% 46% 21% 1	570
	21st to end	Night	8% 2 22% 40% 27% 1	570
July	1st to 10th	Night	11% 2 9% 34% 35% 8%	555
	11th to 20th	Night	5% 3 13% 41% 34% 4	552
	21st to end	Night	7% 1 12% 44% 32% 3	624
August	1st to 10th	Night	8% 3 10% 40% 34% 5%	567
	11th to 20th	Night	6% 2 12% 41% 35% 4	564
	21st to end	Night	6% 2 11% 38% 38% 6%	627
September	1st to 10th	Night	13% 1 13% 37% 31% 4	570
	11th to 20th	Night	8% 3 13% 39% 33% 4	655
	21st to end	Night	13% 4 21% 31% 26% 5%	760
October	1st to 10th	Night	12% 4 22% 36% 22% 4	760
	11th to 20th	Night	18% 11% 28% 29% 14% 1	760
	21st to end	Night	23% 10% 32% 27% 7%	836
November	1st to 10th	Night	12% 7% 37% 32% 11% 1	780
	11th to 20th	Night	18% 12% 35% 27% 8% 1	800
	21st to end	Night	23% 14% 29% 27% 6%	800
December	1st to 10th	Night	22% 10% 36% 27% 4 1	968
	11th to 20th	Night	23% 7% 33% 30% 6% 1	950
	21st to end	Night	31% 13% 31% 22% 3	1045

Page generated at 2024-12-06 02:54:52. Version ac07

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