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 2024-07-02.

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	13% 10% 4 9% 6% 5% 5% 4 6% 7% 32%	89415
	Night	11% 11% 4 10% 6% 5% 5% 4 6% 6% 31%	89856
Transparency	Day	49% 8% 14% 21% 8%	89111
	Night	51% 7% 13% 20% 8% 1	89714
Seeing	Day	16% 11% 32% 26% 12% 3	15689
	Night	16% 8% 33% 31% 11% 1	25665

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	9% 4 2 4 4 4 5% 5% 7% 9% 47%	2717
	11th to 20th	Day	11% 5% 3 7% 5% 5% 5% 4 7% 8% 40%	2700
	21st to end	Day	8% 5% 2 6% 4 4 5% 4 6% 8% 49%	2910
August	1st to 10th	Day	10% 6% 2 6% 4 5% 5% 4 6% 8% 44%	2331
	11th to 20th	Day	12% 5% 2 5% 4 5% 5% 4 6% 7% 44%	2301
	21st to end	Day	13% 5% 2 6% 4 4 4 4 5% 7% 46%	2574
September	1st to 10th	Day	13% 6% 2 5% 4 4 4 3 6% 9% 46%	2188
	11th to 20th	Day	15% 7% 2 7% 5% 4 4 3 5% 8% 39%	2028
	21st to end	Day	19% 7% 3 7% 4 4 3 3 5% 7% 38%	1966
October	1st to 10th	Day	18% 12% 3 7% 4 5% 4 3 5% 6% 32%	1800
	11th to 20th	Day	16% 14% 3 8% 4 4 4 3 4 5% 33%	1800
	21st to end	Day	16% 18% 5% 10% 4 4 4 3 4 6% 25%	1836
November	1st to 10th	Day	14% 17% 5% 10% 6% 5% 3 4 4 6% 28%	1487
	11th to 20th	Day	11% 18% 6% 15% 6% 5% 5% 3 5% 5% 23%	1520
	21st to end	Day	11% 16% 6% 14% 8% 6% 5% 4 5% 4 21%	1520
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% 3 5% 4 3 6% 9% 46%	1330
July	1st to 10th	Night	7% 3 1 4 3 4 4 4 7% 8% 56%	1271
	11th to 20th	Night	6% 4 2 4 4 4 4 4 7% 8% 53%	1260
	21st to end	Night	7% 3 1 4 3 3 4 4 6% 9% 56%	1406
August	1st to 10th	Night	5% 3 2 5% 3 3 4 5% 6% 7% 57%	1605
	11th to 20th	Night	11% 4 1 5% 4 3 3 4 6% 7% 52%	1600
	21st to end	Night	10% 5% 2 5% 4 3 3 2 4 8% 53%	1782
September	1st to 10th	Night	12% 5% 2 4 3 4 3 4 5% 7% 51%	1772
	11th to 20th	Night	12% 6% 2 5% 3 3 3 3 5% 8% 50%	1930
	21st to end	Night	17% 7% 2 5% 4 4 4 4 6% 7% 40%	1980
October	1st to 10th	Night	16% 10% 3 7% 5% 4 4 4 5% 8% 36%	2155
	11th to 20th	Night	16% 11% 5% 6% 4 3 4 3 6% 7% 34%	2160
	21st to end	Night	17% 15% 4 9% 6% 4 4 3 5% 6% 27%	2516
November	1st to 10th	Night	13% 15% 5% 10% 5% 5% 4 3 5% 6% 29%	2591
	11th to 20th	Night	11% 15% 7% 13% 8% 5% 4 3 5% 6% 22%	2660
	21st to end	Night	11% 14% 5% 12% 8% 5% 4 4 5% 5% 25%	2660
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	30% 9% 19% 32% 10%	2643
	11th to 20th	Day	38% 9% 16% 27% 11%	2619
	21st to end	Day	33% 8% 16% 32% 11% 1	2748
August	1st to 10th	Day	36% 8% 17% 29% 8% 1	2316
	11th to 20th	Day	35% 9% 20% 29% 7%	2301
	21st to end	Day	36% 7% 15% 32% 10%	2574
September	1st to 10th	Day	35% 7% 16% 31% 11%	2188
	11th to 20th	Day	42% 8% 19% 25% 6%	2028
	21st to end	Day	45% 7% 14% 30% 4	1966
October	1st to 10th	Day	52% 7% 15% 19% 6%	1800
	11th to 20th	Day	53% 6% 13% 21% 8%	1800
	21st to end	Day	60% 8% 12% 16% 4	1836
November	1st to 10th	Day	59% 6% 11% 17% 7% 1	1487
	11th to 20th	Day	63% 6% 13% 11% 6%	1520
	21st to end	Day	64% 8% 13% 11% 4	1520
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	22% 8% 18% 36% 15% 2	1236
	11th to 20th	Night	25% 10% 19% 28% 17% 1	1218
	21st to end	Night	24% 7% 16% 35% 16% 1	1328
August	1st to 10th	Night	25% 7% 18% 37% 12% 2	1596
	11th to 20th	Night	30% 8% 17% 34% 10% 1	1600
	21st to end	Night	31% 5% 15% 34% 14%	1782
September	1st to 10th	Night	32% 6% 16% 33% 13% 1	1772
	11th to 20th	Night	33% 6% 23% 28% 10%	1930
	21st to end	Night	41% 7% 14% 30% 8%	1980
October	1st to 10th	Night	45% 7% 17% 21% 10%	2155
	11th to 20th	Night	48% 5% 14% 26% 6%	2160
	21st to end	Night	57% 7% 14% 19% 4	2516
November	1st to 10th	Night	55% 6% 13% 18% 7% 1	2591
	11th to 20th	Night	62% 6% 13% 14% 5% 1	2660
	21st to end	Night	59% 8% 15% 13% 5%	2660
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	11% 6% 29% 27% 21% 7%	627
	11th to 20th	Day	12% 8% 29% 29% 17% 4	618
	21st to end	Day	8% 5% 28% 32% 19% 7%	684
August	1st to 10th	Day	8% 6% 26% 32% 22% 5%	626
	11th to 20th	Day	13% 8% 25% 29% 18% 8%	615
	21st to end	Day	15% 8% 27% 28% 19% 3	693
September	1st to 10th	Day	15% 10% 33% 25% 15% 2	478
	11th to 20th	Day	17% 10% 36% 25% 10% 1	318
	21st to end	Day	24% 10% 35% 22% 7% 1	270
October	1st to 10th	Day	20% 11% 30% 24% 12% 3	270
	11th to 20th	Day	19% 12% 37% 26% 6%	270
	21st to end	Day	27% 16% 34% 17% 5% 2	297
November	1st to 10th	Day	23% 10% 32% 27% 7%	270
	11th to 20th	Day	21% 18% 34% 20% 6%	270
	21st to end	Day	21% 17% 34% 24% 3	270
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	8% 4 23% 45% 20% 1	530
	11th to 20th	Night	7% 6% 27% 41% 18% 1	522
	21st to end	Night	9% 5% 20% 43% 23% 1	591
August	1st to 10th	Night	7% 3 23% 45% 22% 1	537
	11th to 20th	Night	11% 4 22% 38% 22% 2	534
	21st to end	Night	12% 7% 26% 35% 20% 1	594
September	1st to 10th	Night	14% 4 26% 36% 17% 2	540
	11th to 20th	Night	14% 6% 31% 34% 14% 1	540
	21st to end	Night	17% 9% 32% 29% 12% 1	540
October	1st to 10th	Night	21% 8% 33% 30% 8%	715
	11th to 20th	Night	23% 8% 35% 27% 8% 1	720
	21st to end	Night	24% 11% 30% 28% 7% 1	923
November	1st to 10th	Night	20% 11% 33% 28% 7% 1	925
	11th to 20th	Night	18% 11% 34% 30% 7% 1	950
	21st to end	Night	17% 12% 40% 24% 6% 1	950
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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