Hayes Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hayes Lake State Park clear sky chart from 2005-11-06 to 2024-11-30.

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% 10% 4 9% 6% 5% 5% 4 6% 7% 33%	102040
	Night	11% 11% 4 10% 6% 5% 5% 4 6% 7% 32%	97717
Transparency	Day	47% 7% 15% 23% 8%	105507
	Night	49% 7% 14% 22% 8% 1	102346
Seeing	Day	16% 11% 32% 26% 12% 3	16278
	Night	16% 8% 33% 31% 11% 1	26218

By Month

Percentage Cloud Cover NE (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	6% 12% 6% 17% 8% 7% 6% 6% 6% 6% 21%	2218
	11th to 20th	Day	4 10% 5% 15% 12% 11% 10% 7% 8% 6% 12%	2220
	21st to end	Day	7% 18% 10% 17% 7% 6% 6% 4 5% 6% 14%	2833
February	1st to 10th	Day	8% 13% 7% 11% 9% 7% 7% 5% 8% 5% 20%	1710
	11th to 20th	Day	8% 10% 5% 9% 9% 8% 8% 5% 6% 8% 25%	1664
	21st to end	Day	6% 10% 5% 13% 8% 7% 7% 5% 6% 8% 24%	1432
March	1st to 10th	Day	10% 12% 3 10% 8% 6% 5% 4 5% 7% 30%	3314
	11th to 20th	Day	7% 9% 4 13% 8% 4 4 4 6% 8% 33%	3480
	21st to end	Day	14% 16% 6% 9% 5% 4 4 3 4 5% 31%	3814
April	1st to 10th	Day	11% 13% 4 8% 6% 4 5% 3 6% 7% 33%	2265
	11th to 20th	Day	14% 12% 4 9% 6% 5% 5% 4 5% 7% 29%	2442
	21st to end	Day	17% 10% 4 8% 5% 5% 4 4 5% 6% 31%	2470
May	1st to 10th	Day	18% 11% 3 7% 4 5% 4 3 5% 7% 33%	4297
	11th to 20th	Day	18% 9% 3 7% 5% 5% 5% 4 6% 6% 32%	4399
	21st to end	Day	21% 11% 3 7% 4 4 4 4 5% 6% 34%	5135
June	1st to 10th	Day	15% 6% 2 7% 5% 4 6% 4 7% 8% 36%	2850
	11th to 20th	Day	15% 7% 3 7% 4 4 5% 4 6% 9% 37%	2850
	21st to end	Day	14% 6% 2 8% 7% 4 6% 5% 7% 7% 35%	2850
July	1st to 10th	Day	8% 4 2 5% 5% 5% 5% 5% 8% 11% 41%	4750
	11th to 20th	Day	8% 4 2 6% 4 5% 4 4 6% 9% 48%	4750
	21st to end	Day	9% 6% 2 6% 4 4 5% 4 6% 8% 45%	5098
August	1st to 10th	Day	10% 6% 2 6% 5% 5% 5% 4 6% 8% 43%	4107
	11th to 20th	Day	12% 5% 2 6% 4 5% 5% 4 6% 8% 43%	4041
	21st to end	Day	15% 5% 2 5% 3 4 4 3 5% 8% 45%	4532
September	1st to 10th	Day	12% 6% 2 5% 4 4 4 3 6% 9% 46%	2309
	11th to 20th	Day	15% 7% 2 6% 5% 4 4 4 6% 8% 39%	2140
	21st to end	Day	18% 7% 3 7% 4 4 3 3 5% 7% 39%	2075
October	1st to 10th	Day	17% 12% 3 7% 4 4 4 3 5% 6% 33%	1900
	11th to 20th	Day	16% 14% 3 8% 4 4 4 3 4 6% 34%	1900
	21st to end	Day	16% 18% 4 10% 4 4 4 3 4 6% 26%	1937
November	1st to 10th	Day	13% 18% 5% 10% 6% 5% 3 4 4 6% 27%	1567
	11th to 20th	Day	11% 18% 6% 15% 6% 5% 5% 3 5% 5% 23%	1600
	21st to end	Day	11% 16% 6% 15% 9% 5% 5% 4 5% 4 20%	1597
December	1st to 10th	Day	9% 15% 5% 14% 10% 8% 7% 6% 5% 6% 15%	1373
	11th to 20th	Day	10% 16% 7% 16% 6% 5% 6% 4 5% 5% 19%	1679
	21st to end	Day	15% 14% 6% 16% 7% 6% 4 3 5% 4 19%	2442
January	1st to 10th	Night	5% 13% 6% 16% 9% 9% 7% 6% 6% 6% 18%	4737
	11th to 20th	Night	5% 12% 6% 17% 13% 9% 9% 6% 8% 5% 11%	4750
	21st to end	Night	9% 19% 8% 14% 7% 6% 5% 4 6% 5% 16%	4831
February	1st to 10th	Night	8% 11% 5% 12% 7% 7% 7% 6% 8% 7% 24%	2470
	11th to 20th	Night	7% 10% 4 9% 6% 6% 7% 6% 6% 7% 31%	2403
	21st to end	Night	7% 10% 4 12% 9% 6% 5% 4 6% 7% 29%	2037
March	1st to 10th	Night	10% 12% 4 11% 9% 5% 5% 4 4 5% 32%	3531
	11th to 20th	Night	6% 10% 4 10% 6% 4 4 4 7% 8% 35%	3479
	21st to end	Night	13% 15% 5% 12% 6% 4 4 3 4 5% 29%	3817
April	1st to 10th	Night	13% 10% 3 6% 6% 4 4 4 5% 6% 39%	1911
	11th to 20th	Night	15% 12% 3 8% 4 4 5% 4 4 6% 36%	1689
	21st to end	Night	15% 10% 4 8% 5% 4 5% 4 5% 6% 34%	1710
May	1st to 10th	Night	19% 9% 3 6% 4 3 4 4 6% 7% 37%	2651
	11th to 20th	Night	16% 8% 2 7% 4 5% 5% 4 6% 6% 38%	2506
	21st to end	Night	18% 8% 2 6% 3 4 3 3 5% 6% 43%	2448
June	1st to 10th	Night	13% 6% 2 5% 3 4 4 4 6% 9% 44%	1330
	11th to 20th	Night	13% 5% 2 5% 5% 5% 4 4 6% 9% 43%	1330
	21st to end	Night	10% 6% 2 5% 4 5% 4 3 6% 9% 46%	1330
July	1st to 10th	Night	8% 3 1 4 3 4 4 4 8% 10% 50%	2220
	11th to 20th	Night	5% 3 2 4 3 3 3 4 5% 9% 60%	2220
	21st to end	Night	8% 4 2 5% 3 3 4 5% 6% 11% 49%	2465
August	1st to 10th	Night	4 4 2 6% 4 4 5% 6% 7% 9% 49%	2830
	11th to 20th	Night	12% 4 1 4 4 3 4 3 6% 8% 51%	2798
	21st to end	Night	10% 6% 2 7% 4 3 3 3 5% 9% 47%	3135
September	1st to 10th	Night	12% 4 2 4 3 4 3 4 5% 7% 52%	1871
	11th to 20th	Night	12% 6% 2 5% 3 4 3 3 5% 8% 49%	2038
	21st to end	Night	16% 7% 2 5% 4 3 3 4 6% 7% 42%	2090
October	1st to 10th	Night	16% 10% 2 7% 4 4 4 4 5% 8% 37%	2275
	11th to 20th	Night	16% 11% 5% 6% 4 3 4 3 6% 7% 35%	2280
	21st to end	Night	16% 15% 4 9% 6% 4 4 3 5% 6% 28%	2657
November	1st to 10th	Night	14% 15% 5% 10% 5% 5% 4 3 5% 6% 29%	2731
	11th to 20th	Night	11% 16% 7% 13% 8% 5% 4 3 5% 6% 22%	2800
	21st to end	Night	11% 15% 5% 14% 8% 5% 4 3 5% 5% 24%	2799
December	1st to 10th	Night	7% 16% 5% 15% 9% 8% 7% 5% 5% 5% 18%	2805
	11th to 20th	Night	9% 16% 6% 16% 8% 6% 5% 4 6% 5% 18%	3518
	21st to end	Night	15% 15% 6% 14% 8% 5% 5% 4 6% 5% 18%	5225

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	61% 9% 11% 15% 5%	2219
	11th to 20th	Day	66% 8% 11% 12% 3	2220
	21st to end	Day	69% 7% 8% 12% 4	2833
February	1st to 10th	Day	60% 6% 11% 14% 8%	1710
	11th to 20th	Day	54% 7% 14% 16% 9% 1	1673
	21st to end	Day	55% 7% 13% 15% 8% 1	1432
March	1st to 10th	Day	51% 7% 15% 20% 7%	3316
	11th to 20th	Day	47% 8% 15% 20% 9%	3480
	21st to end	Day	54% 5% 10% 21% 9%	3814
April	1st to 10th	Day	49% 6% 10% 22% 12% 1	2265
	11th to 20th	Day	52% 7% 12% 19% 9% 1	2442
	21st to end	Day	52% 6% 13% 20% 8% 1	2470
May	1st to 10th	Day	47% 8% 13% 21% 10% 1	4308
	11th to 20th	Day	47% 9% 12% 20% 10% 1	4403
	21st to end	Day	49% 8% 11% 24% 7% 1	5135
June	1st to 10th	Day	42% 10% 16% 23% 9%	2850
	11th to 20th	Day	43% 7% 17% 23% 9%	2850
	21st to end	Day	44% 9% 18% 24% 5%	2850
July	1st to 10th	Day	33% 10% 23% 28% 6%	4676
	11th to 20th	Day	30% 7% 22% 33% 9%	4669
	21st to end	Day	35% 8% 16% 31% 8% 1	4936
August	1st to 10th	Day	37% 7% 16% 28% 11% 1	4092
	11th to 20th	Day	36% 8% 21% 30% 5%	4080
	21st to end	Day	36% 6% 22% 29% 7%	4531
September	1st to 10th	Day	35% 7% 17% 31% 10%	2309
	11th to 20th	Day	41% 8% 19% 26% 6%	2140
	21st to end	Day	44% 7% 14% 30% 6%	2075
October	1st to 10th	Day	39% 5% 14% 28% 13% 1	3160
	11th to 20th	Day	43% 5% 12% 23% 16%	3140
	21st to end	Day	52% 6% 13% 23% 6%	3170
November	1st to 10th	Day	59% 5% 11% 17% 7% 1	1567
	11th to 20th	Day	63% 6% 13% 12% 6%	1600
	21st to end	Day	66% 8% 13% 10% 4	1597
December	1st to 10th	Day	66% 8% 10% 11% 4	1373
	11th to 20th	Day	63% 8% 13% 13% 3	1680
	21st to end	Day	66% 6% 7% 17% 4	2442
January	1st to 10th	Night	63% 8% 12% 13% 3	4737
	11th to 20th	Night	68% 7% 9% 13% 3	4750
	21st to end	Night	67% 7% 12% 11% 4	4831
February	1st to 10th	Night	55% 6% 12% 17% 9%	2470
	11th to 20th	Night	47% 7% 15% 19% 11%	2404
	21st to end	Night	52% 7% 12% 18% 10%	2037
March	1st to 10th	Night	50% 8% 15% 18% 9% 1	3542
	11th to 20th	Night	42% 9% 18% 20% 11%	3480
	21st to end	Night	57% 6% 10% 17% 9% 1	3817
April	1st to 10th	Night	44% 5% 12% 22% 14% 2	1911
	11th to 20th	Night	48% 5% 10% 19% 15% 2	1689
	21st to end	Night	49% 6% 10% 23% 11% 2	1710
May	1st to 10th	Night	44% 8% 11% 25% 12% 1	2660
	11th to 20th	Night	42% 10% 11% 23% 12% 2	2507
	21st to end	Night	42% 7% 12% 27% 11% 1	2449
June	1st to 10th	Night	35% 9% 18% 27% 10% 1	1330
	11th to 20th	Night	37% 8% 15% 24% 15% 2	1330
	21st to end	Night	35% 9% 21% 27% 7% 1	1330
July	1st to 10th	Night	25% 10% 25% 30% 9% 1	2185
	11th to 20th	Night	21% 7% 18% 42% 11% 1	2178
	21st to end	Night	29% 7% 21% 34% 9% 1	2387
August	1st to 10th	Night	29% 6% 19% 33% 11% 1	2821
	11th to 20th	Night	30% 7% 22% 32% 9%	2825
	21st to end	Night	35% 6% 21% 28% 10%	3135
September	1st to 10th	Night	31% 6% 17% 33% 13% 1	1871
	11th to 20th	Night	34% 6% 24% 27% 9%	2038
	21st to end	Night	40% 6% 14% 30% 9%	2090
October	1st to 10th	Night	37% 5% 11% 35% 11% 1	3795
	11th to 20th	Night	42% 4 13% 31% 10%	3779
	21st to end	Night	52% 5% 11% 25% 7%	4382
November	1st to 10th	Night	55% 6% 13% 17% 7% 1	2731
	11th to 20th	Night	62% 6% 13% 14% 5% 1	2800
	21st to end	Night	61% 7% 14% 12% 5%	2799
December	1st to 10th	Night	66% 6% 13% 12% 3	2805
	11th to 20th	Night	65% 7% 11% 13% 4	3516
	21st to end	Night	65% 7% 10% 14% 4	5225

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	14% 10% 39% 24% 11% 2	270
	11th to 20th	Day	11% 9% 37% 33% 9%	270
	21st to end	Day	14% 8% 37% 28% 9% 3	297
February	1st to 10th	Day	13% 14% 41% 23% 7% 1	270
	11th to 20th	Day	11% 18% 37% 22% 10% 2	270
	21st to end	Day	12% 13% 45% 22% 7% 1	225
March	1st to 10th	Day	14% 11% 39% 27% 9% 1	270
	11th to 20th	Day	14% 12% 37% 19% 14% 3	270
	21st to end	Day	14% 12% 37% 25% 9% 2	297
April	1st to 10th	Day	13% 14% 33% 25% 11% 2	445
	11th to 20th	Day	20% 16% 31% 24% 8% 1	640
	21st to end	Day	20% 9% 33% 26% 10% 1	650
May	1st to 10th	Day	20% 14% 31% 23% 9% 2	653
	11th to 20th	Day	20% 10% 31% 25% 12% 3	675
	21st to end	Day	21% 10% 30% 27% 11% 2	734
June	1st to 10th	Day	15% 13% 27% 29% 13% 4	680
	11th to 20th	Day	16% 13% 36% 24% 10% 2	680
	21st to end	Day	15% 10% 28% 27% 15% 5%	680
July	1st to 10th	Day	10% 6% 28% 27% 22% 7%	671
	11th to 20th	Day	12% 8% 27% 29% 18% 5%	668
	21st to end	Day	8% 6% 29% 32% 19% 7%	739
August	1st to 10th	Day	9% 7% 25% 33% 22% 5%	676
	11th to 20th	Day	13% 8% 24% 29% 19% 8%	665
	21st to end	Day	16% 8% 28% 28% 18% 3	748
September	1st to 10th	Day	14% 10% 33% 26% 14% 2	519
	11th to 20th	Day	17% 9% 39% 25% 9% 1	350
	21st to end	Day	24% 11% 34% 22% 8% 1	300
October	1st to 10th	Day	20% 12% 30% 24% 11% 2	300
	11th to 20th	Day	19% 13% 39% 24% 6%	300
	21st to end	Day	26% 16% 33% 18% 5% 2	330
November	1st to 10th	Day	22% 13% 31% 27% 6%	300
	11th to 20th	Day	24% 17% 35% 19% 5%	300
	21st to end	Day	19% 17% 36% 24% 3	299
December	1st to 10th	Day	17% 11% 37% 27% 6% 2	270
	11th to 20th	Day	16% 17% 37% 25% 4	270
	21st to end	Day	19% 11% 34% 22% 12% 2	297
January	1st to 10th	Night	13% 9% 38% 27% 11% 2	950
	11th to 20th	Night	15% 7% 36% 32% 9% 1	950
	21st to end	Night	17% 8% 38% 29% 7%	1045
February	1st to 10th	Night	12% 9% 33% 36% 9% 1	950
	11th to 20th	Night	12% 9% 37% 28% 11% 3	929
	21st to end	Night	11% 8% 39% 29% 11% 2	781
March	1st to 10th	Night	16% 8% 34% 29% 11% 1	646
	11th to 20th	Night	12% 9% 39% 30% 9% 1	570
	21st to end	Night	19% 8% 29% 30% 12% 3	627
April	1st to 10th	Night	17% 8% 33% 29% 11% 1	570
	11th to 20th	Night	18% 10% 32% 28% 10% 1	563
	21st to end	Night	20% 7% 30% 32% 11%	570
May	1st to 10th	Night	20% 6% 32% 33% 8% 1	570
	11th to 20th	Night	17% 8% 33% 31% 11% 1	561
	21st to end	Night	19% 4 32% 34% 11% 1	617
June	1st to 10th	Night	16% 7% 29% 35% 14% 1	570
	11th to 20th	Night	14% 8% 30% 37% 11%	570
	21st to end	Night	12% 5% 28% 35% 19% 1	570
July	1st to 10th	Night	7% 3 23% 43% 22% 2	555
	11th to 20th	Night	6% 6% 27% 41% 18% 2	552
	21st to end	Night	9% 5% 21% 42% 22% 1	624
August	1st to 10th	Night	6% 3 23% 46% 21% 1	567
	11th to 20th	Night	12% 4 21% 38% 23% 3	564
	21st to end	Night	12% 7% 27% 34% 19% 1	627
September	1st to 10th	Night	14% 5% 27% 36% 16% 2	570
	11th to 20th	Night	15% 6% 31% 33% 15% 1	570
	21st to end	Night	17% 9% 33% 29% 12% 1	570
October	1st to 10th	Night	21% 9% 33% 29% 8%	755
	11th to 20th	Night	22% 8% 36% 26% 7% 1	760
	21st to end	Night	24% 11% 31% 27% 6% 1	975
November	1st to 10th	Night	21% 11% 33% 27% 7% 1	975
	11th to 20th	Night	19% 11% 34% 29% 7% 1	1000
	21st to end	Night	17% 12% 40% 23% 6% 1	1000
December	1st to 10th	Night	15% 10% 36% 29% 10% 1	950
	11th to 20th	Night	18% 11% 38% 27% 6% 1	950
	21st to end	Night	21% 8% 35% 27% 9% 1	1045

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