Wolf Creek Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Wolf Creek Park clear sky chart from 2005-11-06 to 2026-06-01.

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	14% 10% 4 9% 5% 5% 5% 4 6% 7% 32%	132094
	Night	14% 11% 4 9% 5% 4 4 4 5% 6% 33%	131083
Transparency	Day	50% 5% 12% 20% 12% 1	135706
	Night	50% 5% 11% 21% 12% 1	135541
Seeing	Day	18% 11% 27% 24% 14% 6%	17462
	Night	19% 9% 28% 29% 13% 1	27351

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	15% 18% 7% 17% 7% 5% 4 3 5% 6% 14%	4691
	11th to 20th	Day	12% 17% 7% 16% 9% 6% 6% 3 3 3 18%	5082
	21st to end	Day	18% 15% 7% 13% 7% 7% 6% 3 4 4 15%	5780
February	1st to 10th	Day	15% 16% 6% 12% 7% 5% 5% 3 4 6% 21%	1890
	11th to 20th	Day	14% 13% 5% 12% 7% 6% 5% 4 4 5% 24%	2006
	21st to end	Day	15% 13% 5% 11% 5% 5% 5% 3 5% 6% 25%	1730
March	1st to 10th	Day	17% 13% 6% 12% 6% 4 4 3 4 5% 26%	4739
	11th to 20th	Day	11% 12% 3 8% 5% 5% 4 4 5% 6% 37%	5090
	21st to end	Day	17% 14% 5% 11% 6% 5% 4 4 5% 5% 25%	5586
April	1st to 10th	Day	14% 11% 3 9% 7% 5% 5% 4 6% 6% 28%	2404
	11th to 20th	Day	16% 10% 3 7% 5% 5% 5% 4 6% 7% 33%	2658
	21st to end	Day	19% 9% 3 7% 5% 4 4 3 5% 6% 35%	2730
May	1st to 10th	Day	21% 9% 4 8% 5% 4 4 4 5% 6% 29%	5992
	11th to 20th	Day	16% 8% 3 7% 5% 5% 5% 4 6% 7% 34%	5991
	21st to end	Day	15% 6% 2 7% 4 5% 5% 4 6% 7% 38%	6576
June	1st to 10th	Day	12% 6% 2 6% 5% 5% 5% 5% 6% 8% 38%	2641
	11th to 20th	Day	10% 6% 2 8% 5% 5% 5% 4 6% 9% 40%	2800
	21st to end	Day	10% 6% 2 6% 5% 5% 5% 5% 8% 9% 38%	2800
July	1st to 10th	Day	8% 6% 2 7% 5% 6% 5% 4 6% 10% 39%	6360
	11th to 20th	Day	8% 5% 2 6% 5% 5% 6% 5% 7% 11% 40%	6181
	21st to end	Day	9% 6% 2 7% 5% 5% 5% 4 7% 10% 39%	6424
August	1st to 10th	Day	10% 5% 2 6% 4 5% 5% 4 8% 10% 42%	4234
	11th to 20th	Day	8% 6% 2 6% 4 5% 6% 5% 9% 11% 38%	4174
	21st to end	Day	8% 5% 3 7% 5% 5% 5% 4 7% 10% 42%	4613
September	1st to 10th	Day	13% 5% 2 4 4 4 4 3 6% 8% 46%	2235
	11th to 20th	Day	8% 5% 2 7% 3 4 5% 4 6% 8% 47%	2200
	21st to end	Day	17% 8% 2 6% 4 4 4 4 5% 6% 41%	2200
October	1st to 10th	Day	12% 7% 2 8% 4 5% 4 4 6% 6% 43%	2145
	11th to 20th	Day	16% 7% 3 7% 5% 4 4 4 5% 6% 39%	2000
	21st to end	Day	17% 9% 3 8% 5% 5% 5% 4 5% 7% 31%	2085
November	1st to 10th	Day	13% 9% 2 6% 4 4 4 3 6% 7% 40%	1852
	11th to 20th	Day	16% 13% 3 8% 5% 4 4 3 4 6% 34%	1890
	21st to end	Day	18% 15% 4 9% 5% 3 4 3 5% 6% 26%	1890
December	1st to 10th	Day	15% 14% 6% 13% 6% 6% 4 3 4 6% 23%	2785
	11th to 20th	Day	19% 18% 7% 10% 5% 4 4 3 4 5% 21%	3413
	21st to end	Day	23% 21% 7% 12% 6% 5% 3 3 3 3 14%	4227
January	1st to 10th	Night	15% 17% 7% 16% 7% 5% 4 3 4 4 18%	8232
	11th to 20th	Night	9% 18% 8% 16% 7% 5% 6% 4 4 5% 18%	7881
	21st to end	Night	17% 15% 7% 10% 5% 5% 5% 4 5% 6% 22%	8401
February	1st to 10th	Night	18% 13% 5% 12% 7% 4 4 4 5% 5% 23%	2730
	11th to 20th	Night	15% 13% 5% 10% 7% 5% 4 5% 5% 5% 26%	2495
	21st to end	Night	17% 14% 5% 10% 5% 4 4 3 4 6% 27%	2076
March	1st to 10th	Night	17% 12% 4 7% 4 4 3 3 4 5% 36%	5334
	11th to 20th	Night	10% 7% 3 6% 4 5% 6% 4 6% 7% 42%	5090
	21st to end	Night	16% 9% 4 8% 5% 4 4 3 5% 6% 36%	5588
April	1st to 10th	Night	16% 12% 3 8% 5% 4 4 4 4 7% 32%	2234
	11th to 20th	Night	15% 7% 3 8% 5% 5% 4 4 5% 6% 37%	1909
	21st to end	Night	16% 9% 2 7% 4 4 4 3 6% 8% 36%	1890
May	1st to 10th	Night	19% 12% 3 10% 5% 5% 4 4 5% 6% 28%	4123
	11th to 20th	Night	15% 8% 3 7% 5% 4 5% 3 5% 7% 38%	4122
	21st to end	Night	14% 6% 2 6% 4 5% 4 4 6% 8% 42%	4520
June	1st to 10th	Night	10% 7% 2 6% 4 5% 4 4 6% 8% 45%	1753
	11th to 20th	Night	9% 5% 2 6% 5% 4 5% 5% 8% 10% 43%	1600
	21st to end	Night	9% 5% 2 5% 5% 4 5% 4 6% 9% 46%	1600
July	1st to 10th	Night	8% 5% 2 6% 4 5% 5% 5% 6% 9% 44%	3618
	11th to 20th	Night	8% 5% 2 6% 4 5% 5% 5% 7% 10% 43%	3783
	21st to end	Night	8% 5% 2 6% 4 4 5% 4 6% 9% 46%	4427
August	1st to 10th	Night	11% 6% 2 7% 4 4 4 4 7% 8% 43%	2915
	11th to 20th	Night	9% 6% 3 8% 4 4 4 4 6% 8% 45%	2875
	21st to end	Night	6% 5% 2 6% 5% 5% 5% 5% 6% 8% 47%	3281
September	1st to 10th	Night	10% 5% 2 5% 4 4 4 3 5% 6% 51%	2145
	11th to 20th	Night	8% 5% 2 5% 4 4 3 3 4 6% 56%	2200
	21st to end	Night	13% 7% 3 6% 4 4 4 4 4 6% 44%	2200
October	1st to 10th	Night	11% 7% 2 6% 4 4 4 4 4 7% 47%	2255
	11th to 20th	Night	17% 8% 3 7% 4 3 4 3 5% 6% 40%	2400
	21st to end	Night	20% 9% 3 6% 4 4 4 3 5% 6% 36%	2750
November	1st to 10th	Night	13% 8% 3 6% 4 4 4 3 5% 6% 43%	2666
	11th to 20th	Night	15% 11% 4 8% 4 4 4 3 5% 7% 34%	2730
	21st to end	Night	20% 14% 5% 9% 5% 5% 4 3 5% 5% 27%	2730
December	1st to 10th	Night	13% 14% 6% 12% 7% 5% 5% 4 5% 6% 25%	4582
	11th to 20th	Night	17% 17% 6% 11% 5% 4 4 3 5% 5% 22%	4968
	21st to end	Night	24% 19% 6% 10% 5% 4 5% 3 5% 5% 14%	6980

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	71% 4 12% 11% 2	4692
	11th to 20th	Day	73% 2 8% 6% 10%	5082
	21st to end	Day	74% 3 7% 11% 5%	5780
February	1st to 10th	Day	66% 4 11% 14% 6%	1890
	11th to 20th	Day	62% 5% 9% 17% 7% 1	2016
	21st to end	Day	59% 5% 14% 15% 6% 1	1730
March	1st to 10th	Day	61% 4 10% 19% 7%	4739
	11th to 20th	Day	47% 4 14% 26% 9% 1	5090
	21st to end	Day	60% 4 11% 16% 8%	5586
April	1st to 10th	Day	54% 7% 11% 16% 11% 1	2404
	11th to 20th	Day	49% 6% 13% 18% 12% 2	2658
	21st to end	Day	48% 6% 12% 22% 11% 2	2730
May	1st to 10th	Day	55% 6% 9% 17% 13% 1	6027
	11th to 20th	Day	47% 7% 13% 20% 11% 2	5995
	21st to end	Day	43% 6% 10% 22% 15% 4	6590
June	1st to 10th	Day	42% 6% 11% 25% 13% 3	2641
	11th to 20th	Day	40% 6% 14% 22% 16% 2	2800
	21st to end	Day	39% 8% 14% 21% 14% 4	2800
July	1st to 10th	Day	38% 6% 11% 26% 17% 2	6291
	11th to 20th	Day	35% 7% 15% 26% 16% 1	6106
	21st to end	Day	38% 7% 13% 21% 19% 2	6240
August	1st to 10th	Day	35% 7% 16% 27% 14% 1	4221
	11th to 20th	Day	35% 7% 14% 31% 11% 1	4213
	21st to end	Day	35% 6% 13% 31% 12% 2	4612
September	1st to 10th	Day	35% 6% 13% 26% 17% 3	2235
	11th to 20th	Day	33% 6% 11% 28% 19% 2	2200
	21st to end	Day	43% 5% 11% 23% 18%	2200
October	1st to 10th	Day	29% 5% 12% 32% 21% 1	3496
	11th to 20th	Day	40% 4 10% 25% 20% 1	3240
	21st to end	Day	42% 5% 11% 22% 18% 1	3348
November	1st to 10th	Day	43% 5% 12% 25% 15% 1	1852
	11th to 20th	Day	53% 4 11% 19% 11% 2	1890
	21st to end	Day	59% 4 12% 18% 7%	1890
December	1st to 10th	Day	64% 4 14% 14% 3	2785
	11th to 20th	Day	66% 4 10% 16% 5%	3410
	21st to end	Day	76% 3 7% 9% 4	4227
January	1st to 10th	Night	70% 4 8% 15% 4	8233
	11th to 20th	Night	70% 3 8% 10% 8% 1	7881
	21st to end	Night	63% 3 12% 13% 8%	8401
February	1st to 10th	Night	62% 5% 11% 15% 6% 1	2730
	11th to 20th	Night	59% 5% 10% 18% 7% 1	2496
	21st to end	Night	59% 4 10% 17% 8% 1	2076
March	1st to 10th	Night	52% 3 11% 24% 9% 1	5334
	11th to 20th	Night	39% 5% 14% 27% 13% 1	5090
	21st to end	Night	49% 4 9% 23% 14% 1	5588
April	1st to 10th	Night	51% 5% 11% 17% 13% 2	2234
	11th to 20th	Night	47% 5% 11% 17% 17% 2	1909
	21st to end	Night	46% 5% 11% 23% 13% 2	1890
May	1st to 10th	Night	58% 5% 9% 14% 13% 2	4150
	11th to 20th	Night	45% 7% 12% 22% 14% 1	4123
	21st to end	Night	40% 6% 11% 25% 16% 2	4528
June	1st to 10th	Night	36% 6% 12% 26% 17% 3	1753
	11th to 20th	Night	34% 8% 14% 25% 16% 3	1600
	21st to end	Night	32% 8% 14% 26% 17% 3	1600
July	1st to 10th	Night	35% 6% 13% 25% 17% 4	3580
	11th to 20th	Night	34% 6% 16% 27% 14% 2	3738
	21st to end	Night	34% 6% 14% 23% 21% 3	4297
August	1st to 10th	Night	37% 7% 13% 26% 15% 2	2904
	11th to 20th	Night	35% 6% 12% 30% 16% 1	2902
	21st to end	Night	33% 7% 13% 29% 17% 2	3281
September	1st to 10th	Night	33% 6% 13% 26% 17% 5%	2145
	11th to 20th	Night	29% 5% 10% 28% 25% 2	2200
	21st to end	Night	40% 6% 11% 23% 19% 2	2200
October	1st to 10th	Night	27% 4 9% 31% 29% 1	3684
	11th to 20th	Night	38% 4 10% 27% 20% 1	3899
	21st to end	Night	37% 4 10% 31% 17% 3	4437
November	1st to 10th	Night	42% 4 12% 24% 17% 2	2666
	11th to 20th	Night	51% 4 11% 22% 11% 2	2730
	21st to end	Night	59% 4 12% 18% 6% 1	2730
December	1st to 10th	Night	61% 4 12% 17% 6%	4582
	11th to 20th	Night	63% 4 12% 14% 5% 1	4970
	21st to end	Night	72% 5% 10% 10% 4	6980

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	23% 20% 34% 17% 5% 1	330
	11th to 20th	Day	23% 21% 42% 11% 3 1	330
	21st to end	Day	26% 18% 30% 20% 5%	363
February	1st to 10th	Day	25% 15% 39% 16% 4 1	330
	11th to 20th	Day	23% 19% 33% 21% 3	330
	21st to end	Day	23% 22% 40% 12% 3	273
March	1st to 10th	Day	23% 15% 37% 19% 5%	398
	11th to 20th	Day	24% 15% 35% 20% 5% 1	540
	21st to end	Day	29% 14% 31% 19% 5% 1	594
April	1st to 10th	Day	21% 16% 31% 22% 9% 1	540
	11th to 20th	Day	21% 18% 30% 18% 10% 3	532
	21st to end	Day	24% 11% 30% 24% 9% 2	540
May	1st to 10th	Day	25% 11% 32% 21% 9% 2	543
	11th to 20th	Day	19% 10% 30% 24% 11% 6%	567
	21st to end	Day	14% 7% 25% 27% 17% 10%	617
June	1st to 10th	Day	13% 6% 27% 31% 18% 4	571
	11th to 20th	Day	13% 6% 28% 28% 20% 5%	730
	21st to end	Day	12% 7% 25% 31% 19% 5%	730
July	1st to 10th	Day	12% 4 19% 32% 20% 13%	721
	11th to 20th	Day	9% 4 22% 30% 23% 12%	643
	21st to end	Day	10% 5% 20% 25% 27% 13%	576
August	1st to 10th	Day	10% 4 15% 29% 27% 15%	526
	11th to 20th	Day	12% 2 15% 34% 25% 13%	519
	21st to end	Day	9% 3 18% 30% 26% 14%	583
September	1st to 10th	Day	15% 4 15% 27% 23% 15%	530
	11th to 20th	Day	8% 2 15% 24% 32% 20%	530
	21st to end	Day	20% 9% 21% 23% 18% 10%	530
October	1st to 10th	Day	13% 7% 22% 28% 21% 9%	530
	11th to 20th	Day	17% 14% 31% 26% 9% 3	530
	21st to end	Day	22% 14% 35% 22% 6% 1	468
November	1st to 10th	Day	17% 14% 34% 21% 11% 4	330
	11th to 20th	Day	26% 18% 31% 16% 8% 1	330
	21st to end	Day	27% 15% 35% 19% 3	330
December	1st to 10th	Day	20% 20% 34% 18% 7% 1	254
	11th to 20th	Day	22% 22% 34% 18% 4	311
	21st to end	Day	31% 18% 29% 18% 3	363
January	1st to 10th	Night	25% 14% 35% 21% 5%	1050
	11th to 20th	Night	27% 15% 38% 16% 4	911
	21st to end	Night	23% 16% 35% 23% 4	924
February	1st to 10th	Night	25% 14% 33% 26% 3	840
	11th to 20th	Night	23% 12% 37% 26% 2	823
	21st to end	Night	25% 15% 39% 19% 3	692
March	1st to 10th	Night	21% 12% 34% 27% 6%	840
	11th to 20th	Night	19% 16% 35% 23% 6% 1	840
	21st to end	Night	23% 12% 31% 27% 7%	924
April	1st to 10th	Night	22% 14% 35% 25% 5%	764
	11th to 20th	Night	18% 12% 36% 25% 9% 1	623
	21st to end	Night	21% 7% 33% 29% 9% 1	630
May	1st to 10th	Night	23% 6% 29% 33% 8% 1	630
	11th to 20th	Night	20% 7% 26% 32% 13% 1	621
	21st to end	Night	13% 3 22% 41% 19% 3	683
June	1st to 10th	Night	13% 3 24% 42% 17% 1	600
	11th to 20th	Night	11% 3 22% 44% 20% 1	600
	21st to end	Night	11% 3 22% 39% 23% 2	600
July	1st to 10th	Night	9% 3 15% 40% 30% 3	585
	11th to 20th	Night	10% 3 17% 41% 25% 5%	582
	21st to end	Night	8% 2 13% 42% 32% 3	657
August	1st to 10th	Night	8% 2 12% 43% 31% 4	597
	11th to 20th	Night	10% 2 15% 36% 32% 5%	594
	21st to end	Night	8% 3 13% 37% 35% 4	660
September	1st to 10th	Night	12% 4 15% 35% 29% 5%	745
	11th to 20th	Night	10% 3 13% 35% 34% 5%	800
	21st to end	Night	16% 6% 20% 32% 23% 3	800
October	1st to 10th	Night	13% 8% 22% 34% 20% 3	800
	11th to 20th	Night	22% 11% 28% 28% 10% 1	800
	21st to end	Night	24% 11% 30% 27% 7% 1	880
November	1st to 10th	Night	16% 11% 33% 28% 10% 2	820
	11th to 20th	Night	21% 14% 33% 23% 7% 1	840
	21st to end	Night	27% 11% 33% 24% 5% 1	840
December	1st to 10th	Night	25% 14% 36% 20% 5%	840
	11th to 20th	Night	26% 13% 35% 22% 4	840
	21st to end	Night	31% 13% 32% 21% 3	1076

Page generated at 2026-05-29 01:53:29. Version ac07

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