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 2025-02-06.

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%	108753
	Night	14% 11% 4 9% 5% 4 4 4 5% 6% 33%	109504
Transparency	Day	50% 5% 12% 20% 12% 1	112409
	Night	50% 5% 11% 20% 12% 1	113987
Seeing	Day	18% 10% 27% 24% 14% 6%	15676
	Night	19% 9% 28% 29% 13% 2	25617

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	14% 19% 8% 18% 7% 5% 4 3 4 5% 14%	3617
	11th to 20th	Day	14% 18% 6% 15% 8% 6% 7% 3 3 4 16%	3901
	21st to end	Day	22% 16% 9% 13% 6% 5% 4 3 3 3 15%	4466
February	1st to 10th	Day	16% 16% 5% 12% 7% 5% 5% 3 4 5% 21%	1755
	11th to 20th	Day	14% 13% 5% 12% 7% 6% 5% 4 4 6% 24%	1810
	21st to end	Day	16% 14% 5% 11% 6% 5% 5% 3 5% 6% 26%	1570
March	1st to 10th	Day	20% 16% 5% 11% 6% 4 4 3 4 5% 23%	3234
	11th to 20th	Day	12% 13% 4 8% 5% 5% 4 4 4 6% 34%	3480
	21st to end	Day	20% 12% 5% 10% 5% 4 4 3 5% 5% 26%	3815
April	1st to 10th	Day	13% 11% 3 10% 7% 5% 5% 4 6% 6% 29%	2175
	11th to 20th	Day	16% 10% 3 7% 5% 5% 4 3 6% 7% 34%	2402
	21st to end	Day	20% 9% 3 7% 5% 4 4 3 5% 6% 34%	2470
May	1st to 10th	Day	18% 9% 4 9% 6% 5% 4 4 6% 7% 30%	4082
	11th to 20th	Day	17% 7% 3 6% 5% 5% 5% 4 6% 7% 34%	4081
	21st to end	Day	10% 5% 3 7% 5% 6% 5% 4 7% 7% 41%	4476
June	1st to 10th	Day	12% 6% 2 7% 5% 5% 5% 5% 6% 9% 38%	2509
	11th to 20th	Day	10% 6% 2 8% 5% 5% 5% 4 6% 9% 41%	2660
	21st to end	Day	10% 6% 2 6% 6% 5% 5% 5% 7% 9% 38%	2660
July	1st to 10th	Day	10% 6% 3 7% 5% 6% 5% 4 6% 10% 37%	4440
	11th to 20th	Day	7% 4 1 5% 5% 5% 6% 5% 7% 11% 44%	4317
	21st to end	Day	7% 6% 2 7% 6% 5% 6% 5% 7% 10% 40%	4466
August	1st to 10th	Day	11% 5% 2 6% 4 5% 5% 4 8% 10% 42%	4104
	11th to 20th	Day	8% 5% 2 6% 4 5% 6% 5% 9% 11% 38%	4044
	21st to end	Day	8% 5% 3 7% 5% 5% 5% 4 7% 11% 42%	4472
September	1st to 10th	Day	14% 5% 2 5% 4 4 4 3 6% 8% 44%	2123
	11th to 20th	Day	9% 5% 2 7% 3 4 6% 5% 6% 8% 46%	2090
	21st to end	Day	17% 8% 2 6% 4 4 4 4 5% 6% 41%	2090
October	1st to 10th	Day	12% 7% 3 8% 4 5% 4 4 6% 6% 42%	2038
	11th to 20th	Day	16% 8% 3 7% 5% 4 4 5% 5% 6% 38%	1900
	21st to end	Day	17% 10% 3 8% 5% 5% 5% 4 5% 7% 31%	1981
November	1st to 10th	Day	12% 10% 2 6% 4 5% 4 3 6% 7% 40%	1762
	11th to 20th	Day	16% 13% 3 8% 5% 4 4 3 4 6% 33%	1800
	21st to end	Day	18% 15% 4 9% 5% 3 4 3 5% 6% 27%	1800
December	1st to 10th	Day	14% 14% 6% 12% 6% 6% 4 3 4 6% 23%	2702
	11th to 20th	Day	19% 18% 7% 10% 5% 4 4 3 4 5% 21%	3325
	21st to end	Day	23% 21% 7% 12% 6% 5% 3 3 3 3 14%	4136
January	1st to 10th	Night	15% 17% 7% 17% 7% 4 4 3 4 4 17%	6348
	11th to 20th	Night	11% 19% 8% 16% 8% 5% 6% 4 4 4 14%	6059
	21st to end	Night	20% 16% 8% 10% 5% 4 4 3 3 5% 22%	6490
February	1st to 10th	Night	19% 14% 5% 11% 7% 4 4 4 5% 5% 22%	2536
	11th to 20th	Night	15% 13% 5% 9% 7% 5% 4 4 4 5% 27%	2252
	21st to end	Night	19% 14% 4 10% 6% 5% 4 3 4 6% 27%	1884
March	1st to 10th	Night	19% 14% 5% 7% 4 4 3 2 4 5% 35%	3619
	11th to 20th	Night	11% 8% 3 5% 4 4 5% 4 6% 7% 42%	3480
	21st to end	Night	17% 9% 4 8% 5% 4 4 4 5% 6% 35%	3817
April	1st to 10th	Night	15% 12% 3 8% 5% 4 4 4 4 7% 33%	2022
	11th to 20th	Night	17% 7% 3 8% 5% 5% 4 4 5% 6% 37%	1725
	21st to end	Night	16% 9% 2 8% 4 4 4 3 6% 8% 36%	1710
May	1st to 10th	Night	18% 9% 3 10% 5% 5% 4 4 6% 7% 30%	2813
	11th to 20th	Night	17% 8% 3 6% 5% 4 5% 4 4 7% 39%	2812
	21st to end	Night	9% 5% 2 6% 4 4 5% 4 6% 8% 48%	3079
June	1st to 10th	Night	10% 7% 2 6% 4 5% 4 4 6% 8% 45%	1666
	11th to 20th	Night	8% 5% 2 6% 5% 4 5% 5% 8% 10% 43%	1520
	21st to end	Night	9% 5% 2 5% 5% 5% 5% 4 6% 9% 45%	1520
July	1st to 10th	Night	8% 4 2 6% 4 5% 5% 5% 6% 9% 46%	2530
	11th to 20th	Night	8% 4 2 5% 3 4 4 4 7% 10% 50%	2644
	21st to end	Night	6% 5% 2 6% 4 5% 6% 5% 7% 9% 45%	3087
August	1st to 10th	Night	11% 6% 2 7% 4 4 4 4 6% 9% 42%	2825
	11th to 20th	Night	9% 6% 3 8% 4 4 4 4 6% 8% 45%	2785
	21st to end	Night	6% 5% 2 6% 5% 5% 5% 5% 6% 8% 47%	3180
September	1st to 10th	Night	10% 6% 2 5% 4 4 4 3 5% 6% 50%	2038
	11th to 20th	Night	9% 5% 2 5% 4 4 3 4 5% 7% 54%	2090
	21st to end	Night	13% 7% 3 6% 4 4 4 4 4 6% 44%	2090
October	1st to 10th	Night	11% 7% 2 6% 4 4 4 4 4 7% 47%	2142
	11th to 20th	Night	17% 8% 3 7% 4 3 3 3 5% 6% 39%	2280
	21st to end	Night	20% 9% 3 6% 4 4 4 3 5% 6% 35%	2612
November	1st to 10th	Night	13% 8% 4 7% 4 4 4 3 4 6% 43%	2536
	11th to 20th	Night	15% 11% 4 8% 4 4 4 3 5% 7% 34%	2600
	21st to end	Night	20% 13% 5% 9% 5% 5% 4 3 5% 5% 27%	2600
December	1st to 10th	Night	13% 14% 6% 12% 7% 5% 5% 4 5% 6% 25%	4446
	11th to 20th	Night	17% 18% 6% 11% 5% 4 4 3 5% 5% 22%	4837
	21st to end	Night	24% 19% 6% 9% 5% 4 5% 3 5% 6% 14%	6830

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	72% 4 10% 12% 2	3618
	11th to 20th	Day	75% 3 8% 5% 8%	3901
	21st to end	Day	76% 3 6% 9% 6%	4466
February	1st to 10th	Day	66% 4 11% 13% 6%	1755
	11th to 20th	Day	61% 5% 9% 17% 7% 1	1820
	21st to end	Day	59% 5% 13% 15% 6% 2	1570
March	1st to 10th	Day	64% 4 9% 18% 5%	3234
	11th to 20th	Day	51% 4 13% 23% 8% 1	3480
	21st to end	Day	59% 5% 13% 16% 7%	3815
April	1st to 10th	Day	53% 7% 11% 17% 11% 1	2175
	11th to 20th	Day	48% 6% 12% 19% 12% 2	2402
	21st to end	Day	49% 6% 12% 21% 11% 2	2470
May	1st to 10th	Day	52% 7% 10% 21% 9% 1	4120
	11th to 20th	Day	47% 7% 12% 23% 9% 1	4085
	21st to end	Day	38% 7% 12% 20% 18% 5%	4489
June	1st to 10th	Day	42% 6% 11% 26% 12% 3	2509
	11th to 20th	Day	39% 7% 14% 22% 16% 2	2660
	21st to end	Day	40% 8% 14% 20% 14% 4	2660
July	1st to 10th	Day	41% 6% 12% 22% 17% 3	4371
	11th to 20th	Day	31% 7% 13% 30% 18% 2	4242
	21st to end	Day	37% 8% 15% 18% 20% 3	4324
August	1st to 10th	Day	35% 7% 16% 27% 14% 1	4091
	11th to 20th	Day	35% 7% 14% 31% 11% 1	4083
	21st to end	Day	36% 6% 13% 31% 12% 2	4471
September	1st to 10th	Day	37% 6% 13% 24% 17% 3	2123
	11th to 20th	Day	34% 7% 12% 26% 20% 2	2090
	21st to end	Day	43% 5% 11% 23% 18%	2090
October	1st to 10th	Day	29% 5% 13% 32% 21% 1	3389
	11th to 20th	Day	40% 4 10% 25% 20% 1	3140
	21st to end	Day	42% 5% 12% 23% 18% 1	3244
November	1st to 10th	Day	42% 5% 12% 24% 15% 1	1762
	11th to 20th	Day	53% 5% 11% 19% 11% 1	1800
	21st to end	Day	58% 4 12% 18% 7%	1800
December	1st to 10th	Day	64% 4 15% 14% 3	2702
	11th to 20th	Day	66% 4 9% 16% 5%	3322
	21st to end	Day	76% 3 7% 9% 4	4136
January	1st to 10th	Night	70% 4 7% 15% 3	6348
	11th to 20th	Night	76% 3 7% 8% 6%	6059
	21st to end	Night	67% 3 12% 10% 7%	6490
February	1st to 10th	Night	63% 5% 11% 14% 6% 1	2536
	11th to 20th	Night	59% 4 10% 19% 7% 1	2253
	21st to end	Night	59% 5% 10% 16% 8% 2	1884
March	1st to 10th	Night	53% 4 11% 23% 8% 1	3619
	11th to 20th	Night	40% 7% 15% 23% 14% 1	3480
	21st to end	Night	49% 5% 10% 27% 8% 1	3817
April	1st to 10th	Night	50% 5% 12% 18% 13% 2	2022
	11th to 20th	Night	46% 6% 11% 17% 17% 2	1725
	21st to end	Night	46% 5% 11% 22% 14% 3	1710
May	1st to 10th	Night	54% 5% 10% 18% 11% 2	2840
	11th to 20th	Night	43% 8% 12% 23% 13% 1	2813
	21st to end	Night	32% 7% 12% 27% 19% 2	3087
June	1st to 10th	Night	36% 6% 12% 27% 16% 4	1666
	11th to 20th	Night	34% 8% 14% 25% 17% 3	1520
	21st to end	Night	33% 9% 13% 26% 16% 3	1520
July	1st to 10th	Night	34% 6% 12% 26% 17% 5%	2490
	11th to 20th	Night	28% 6% 17% 30% 17% 3	2596
	21st to end	Night	33% 7% 16% 21% 19% 4	2988
August	1st to 10th	Night	38% 7% 13% 26% 15% 2	2814
	11th to 20th	Night	36% 6% 12% 29% 16% 1	2812
	21st to end	Night	33% 7% 13% 29% 17% 2	3180
September	1st to 10th	Night	33% 6% 13% 25% 17% 5%	2038
	11th to 20th	Night	30% 5% 11% 27% 25% 2	2090
	21st to end	Night	40% 6% 11% 24% 18% 2	2090
October	1st to 10th	Night	27% 4 9% 31% 29% 1	3571
	11th to 20th	Night	38% 4 10% 27% 20% 1	3779
	21st to end	Night	37% 4 10% 31% 16% 3	4299
November	1st to 10th	Night	42% 4 12% 23% 16% 2	2536
	11th to 20th	Night	51% 4 11% 21% 12% 2	2600
	21st to end	Night	59% 4 12% 18% 6% 1	2600
December	1st to 10th	Night	61% 4 12% 17% 6%	4446
	11th to 20th	Night	63% 4 12% 14% 5% 1	4839
	21st to end	Night	72% 5% 10% 10% 4	6830

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% 21% 32% 18% 5% 1	300
	11th to 20th	Day	23% 19% 42% 11% 3 1	300
	21st to end	Day	28% 16% 31% 20% 5%	330
February	1st to 10th	Day	27% 17% 39% 14% 3	285
	11th to 20th	Day	24% 19% 33% 20% 4	270
	21st to end	Day	25% 22% 40% 11% 3	225
March	1st to 10th	Day	24% 15% 35% 20% 5%	332
	11th to 20th	Day	22% 14% 36% 21% 5% 2	460
	21st to end	Day	32% 12% 30% 20% 6% 1	506
April	1st to 10th	Day	19% 15% 30% 25% 10% 1	460
	11th to 20th	Day	22% 16% 30% 17% 11% 4	452
	21st to end	Day	25% 10% 32% 23% 8% 2	460
May	1st to 10th	Day	24% 10% 32% 22% 11% 2	463
	11th to 20th	Day	20% 8% 29% 23% 12% 7%	487
	21st to end	Day	12% 7% 23% 29% 19% 11%	529
June	1st to 10th	Day	13% 6% 27% 31% 19% 5%	529
	11th to 20th	Day	13% 6% 27% 28% 21% 5%	680
	21st to end	Day	13% 8% 26% 30% 18% 5%	680
July	1st to 10th	Day	12% 4 19% 31% 21% 13%	671
	11th to 20th	Day	9% 4 22% 30% 23% 12%	597
	21st to end	Day	10% 5% 20% 25% 27% 13%	532
August	1st to 10th	Day	11% 4 15% 30% 25% 15%	486
	11th to 20th	Day	13% 2 16% 33% 25% 12%	479
	21st to end	Day	9% 4 17% 30% 26% 15%	539
September	1st to 10th	Day	16% 3 15% 28% 23% 13%	490
	11th to 20th	Day	9% 2 16% 23% 31% 19%	490
	21st to end	Day	20% 9% 22% 23% 17% 9%	490
October	1st to 10th	Day	14% 8% 22% 28% 20% 8%	490
	11th to 20th	Day	18% 15% 30% 25% 9% 3	490
	21st to end	Day	23% 13% 34% 22% 6% 1	430
November	1st to 10th	Day	16% 14% 33% 22% 11% 4	300
	11th to 20th	Day	26% 17% 30% 17% 9% 1	300
	21st to end	Day	26% 16% 36% 20% 3	300
December	1st to 10th	Day	20% 19% 35% 17% 7% 1	231
	11th to 20th	Day	22% 22% 34% 19% 4	283
	21st to end	Day	30% 18% 30% 18% 3	330
January	1st to 10th	Night	25% 14% 35% 21% 5%	1000
	11th to 20th	Night	28% 14% 37% 16% 4	868
	21st to end	Night	23% 15% 34% 23% 4	880
February	1st to 10th	Night	26% 14% 33% 25% 3	781
	11th to 20th	Night	23% 12% 36% 27% 3	743
	21st to end	Night	26% 14% 38% 19% 3	628
March	1st to 10th	Night	21% 11% 33% 28% 7%	760
	11th to 20th	Night	18% 15% 36% 24% 6% 1	760
	21st to end	Night	22% 11% 30% 28% 8%	836
April	1st to 10th	Night	20% 13% 35% 26% 5%	692
	11th to 20th	Night	19% 10% 37% 24% 10% 1	563
	21st to end	Night	21% 7% 34% 28% 9% 1	570
May	1st to 10th	Night	22% 6% 28% 34% 9% 1	570
	11th to 20th	Night	21% 7% 25% 32% 14% 1	561
	21st to end	Night	12% 3 21% 40% 21% 3	617
June	1st to 10th	Night	12% 3 23% 43% 18% 1	570
	11th to 20th	Night	11% 3 21% 44% 20% 1	570
	21st to end	Night	12% 3 22% 39% 22% 2	570
July	1st to 10th	Night	9% 3 15% 39% 30% 4	555
	11th to 20th	Night	10% 3 17% 41% 25% 5%	552
	21st to end	Night	8% 2 14% 42% 32% 2	624
August	1st to 10th	Night	8% 2 13% 43% 31% 4	567
	11th to 20th	Night	10% 2 16% 36% 31% 5%	564
	21st to end	Night	8% 3 13% 37% 35% 4	627
September	1st to 10th	Night	12% 4 15% 36% 29% 4	708
	11th to 20th	Night	10% 3 13% 35% 33% 5%	760
	21st to end	Night	16% 6% 21% 32% 22% 3	760
October	1st to 10th	Night	14% 8% 22% 34% 19% 3	760
	11th to 20th	Night	22% 11% 29% 27% 10% 1	760
	21st to end	Night	24% 11% 30% 26% 7% 1	836
November	1st to 10th	Night	16% 11% 33% 28% 11% 2	780
	11th to 20th	Night	22% 14% 33% 23% 7% 1	800
	21st to end	Night	26% 12% 33% 24% 5% 1	800
December	1st to 10th	Night	25% 14% 36% 20% 6%	800
	11th to 20th	Night	27% 14% 34% 22% 4	800
	21st to end	Night	30% 13% 32% 21% 4	1025

Page generated at 2025-02-03 03:05:53. Version ac07

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