Hugo Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Hugo Lake State Park clear sky chart from 2005-11-06 to 2024-08-30.

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	15% 6% 2 5% 4 4 4 3 5% 7% 46%	95603
	Night	14% 5% 2 5% 3 3 3 3 5% 7% 51%	93510
Transparency	Day	38% 5% 10% 23% 19% 5%	95379
	Night	34% 4 9% 23% 22% 8%	93340
Seeing	Day	15% 9% 23% 28% 20% 5%	15072
	Night	15% 8% 26% 33% 17% 2	24860

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	16% 9% 3 5% 3 3 3 2 4 5% 47%	2847
	11th to 20th	Day	11% 6% 1 4 2 3 2 3 4 5% 59%	2850
	21st to end	Day	22% 8% 3 6% 3 2 3 2 3 4 44%	3135
February	1st to 10th	Day	23% 8% 2 6% 3 3 3 3 4 5% 41%	1710
	11th to 20th	Day	21% 7% 2 5% 4 3 3 3 4 5% 44%	1811
	21st to end	Day	26% 5% 2 5% 2 3 3 2 3 4 45%	1673
March	1st to 10th	Day	20% 6% 2 6% 3 3 3 3 4 5% 46%	3436
	11th to 20th	Day	17% 8% 3 7% 4 4 4 3 5% 7% 39%	3480
	21st to end	Day	19% 10% 3 6% 4 4 3 3 5% 6% 38%	3814
April	1st to 10th	Day	18% 6% 2 6% 3 4 3 3 4 6% 45%	2104
	11th to 20th	Day	20% 5% 2 5% 4 3 4 3 5% 7% 44%	2254
	21st to end	Day	19% 6% 2 5% 3 3 4 4 5% 6% 42%	2308
May	1st to 10th	Day	22% 7% 2 7% 4 4 4 3 4 6% 38%	4082
	11th to 20th	Day	15% 6% 2 5% 4 4 4 4 5% 7% 44%	4082
	21st to end	Day	21% 9% 3 7% 4 4 4 3 5% 7% 34%	4477
June	1st to 10th	Day	10% 4 2 6% 4 4 6% 4 7% 9% 44%	2470
	11th to 20th	Day	8% 5% 2 7% 5% 4 5% 4 7% 8% 44%	2470
	21st to end	Day	6% 4 2 4 4 4 4 4 7% 8% 54%	2470
July	1st to 10th	Day	8% 6% 2 6% 4 4 5% 4 8% 10% 44%	4120
	11th to 20th	Day	4 3 1 4 4 4 4 4 7% 10% 56%	4120
	21st to end	Day	8% 6% 2 7% 6% 6% 6% 5% 7% 10% 37%	4465
August	1st to 10th	Day	4 3 1 4 4 5% 5% 5% 7% 9% 54%	2458
	11th to 20th	Day	9% 4 2 5% 4 3 4 4 7% 9% 48%	2431
	21st to end	Day	6% 5% 2 5% 5% 4 5% 5% 6% 11% 47%	2485
September	1st to 10th	Day	11% 4 2 4 4 4 5% 4 5% 7% 51%	2042
	11th to 20th	Day	10% 5% 2 6% 4 4 5% 4 5% 8% 47%	1980
	21st to end	Day	8% 4 2 4 4 3 4 4 5% 7% 55%	1980
October	1st to 10th	Day	9% 4 2 5% 4 4 4 3 4 5% 56%	1846
	11th to 20th	Day	16% 5% 2 4 3 2 2 2 3 4 58%	1800
	21st to end	Day	19% 6% 2 4 3 3 3 2 3 4 52%	1980
November	1st to 10th	Day	16% 5% 1 4 4 3 3 3 4 7% 50%	1858
	11th to 20th	Day	13% 5% 2 4 3 3 3 3 4 6% 55%	1849
	21st to end	Day	21% 4 2 4 2 3 2 2 4 5% 52%	1710
December	1st to 10th	Day	18% 7% 2 4 2 2 4 2 4 5% 49%	1710
	11th to 20th	Day	19% 8% 3 5% 4 3 3 3 4 7% 42%	2161
	21st to end	Day	22% 8% 2 4 3 3 4 2 4 6% 42%	3135
January	1st to 10th	Night	14% 9% 2 4 2 3 3 2 4 5% 51%	4108
	11th to 20th	Night	13% 6% 1 3 3 2 2 2 3 5% 58%	4120
	21st to end	Night	24% 6% 2 4 3 3 2 2 3 5% 45%	4532
February	1st to 10th	Night	20% 7% 2 5% 4 3 3 3 3 4 46%	2470
	11th to 20th	Night	19% 7% 2 5% 3 2 4 3 4 6% 46%	2272
	21st to end	Night	20% 5% 2 5% 2 3 3 3 3 4 49%	1780
March	1st to 10th	Night	20% 9% 2 6% 3 3 3 3 4 5% 40%	3419
	11th to 20th	Night	16% 7% 2 5% 3 3 3 2 4 5% 49%	3480
	21st to end	Night	17% 6% 2 5% 4 4 3 3 4 6% 45%	3817
April	1st to 10th	Night	15% 6% 1 5% 3 4 4 3 5% 5% 50%	2075
	11th to 20th	Night	16% 5% 1 4 4 3 3 3 5% 7% 48%	1875
	21st to end	Night	15% 6% 2 5% 3 3 3 3 5% 8% 48%	1867
May	1st to 10th	Night	21% 7% 2 6% 4 3 3 3 5% 8% 37%	2823
	11th to 20th	Night	14% 4 2 5% 3 4 4 4 5% 7% 47%	2823
	21st to end	Night	15% 7% 1 6% 4 4 4 4 6% 8% 40%	3090
June	1st to 10th	Night	5% 4 2 4 4 3 4 4 5% 10% 56%	1710
	11th to 20th	Night	5% 3 2 4 2 2 4 3 6% 8% 59%	1710
	21st to end	Night	4 3 1 3 3 2 3 3 6% 9% 63%	1710
July	1st to 10th	Night	7% 4 1 4 4 4 4 4 6% 9% 53%	2850
	11th to 20th	Night	4 2 1 3 3 3 3 3 5% 8% 64%	2850
	21st to end	Night	5% 4 1 6% 4 5% 6% 4 6% 9% 49%	3098
August	1st to 10th	Night	3 2 1 3 2 3 4 4 6% 10% 61%	1701
	11th to 20th	Night	6% 3 1 5% 3 3 4 4 6% 10% 55%	1690
	21st to end	Night	3 4 2 5% 5% 5% 5% 4 5% 9% 54%	2079
September	1st to 10th	Night	6% 4 2 4 3 4 4 3 5% 7% 58%	1914
	11th to 20th	Night	11% 4 2 5% 4 4 4 5% 5% 6% 51%	1980
	21st to end	Night	8% 3 1 4 3 4 3 3 4 7% 62%	1980
October	1st to 10th	Night	9% 3 1 3 3 3 3 3 5% 7% 60%	2096
	11th to 20th	Night	14% 4 1 3 2 2 3 2 4 5% 60%	2160
	21st to end	Night	17% 5% 2 4 2 2 2 2 3 4 57%	2376
November	1st to 10th	Night	13% 4 1 5% 2 3 3 2 4 6% 58%	2220
	11th to 20th	Night	11% 6% 1 4 2 2 3 3 4 6% 58%	2327
	21st to end	Night	19% 6% 2 4 2 3 3 3 4 5% 50%	2470
December	1st to 10th	Night	17% 5% 2 4 2 2 3 3 5% 6% 52%	2470
	11th to 20th	Night	17% 7% 2 5% 4 3 3 3 4 6% 46%	3036
	21st to end	Night	19% 7% 3 5% 2 2 3 3 4 5% 48%	4532

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	40% 3 6% 25% 23% 3	2848
	11th to 20th	Day	29% 3 10% 29% 25% 4	2850
	21st to end	Day	46% 2 5% 19% 21% 7%	3135
February	1st to 10th	Day	47% 3 8% 17% 20% 5%	1710
	11th to 20th	Day	44% 3 6% 20% 20% 6%	1821
	21st to end	Day	45% 2 5% 15% 24% 8%	1673
March	1st to 10th	Day	42% 3 7% 16% 22% 10%	3436
	11th to 20th	Day	45% 4 10% 19% 17% 4	3480
	21st to end	Day	48% 4 8% 21% 17% 2	3814
April	1st to 10th	Day	41% 3 9% 21% 19% 7%	2104
	11th to 20th	Day	40% 5% 9% 19% 20% 7%	2254
	21st to end	Day	42% 6% 8% 21% 19% 4	2308
May	1st to 10th	Day	49% 5% 8% 24% 13% 2	4120
	11th to 20th	Day	40% 5% 11% 25% 20% 1	4086
	21st to end	Day	50% 6% 11% 17% 13% 2	4489
June	1st to 10th	Day	35% 7% 13% 27% 16% 2	2470
	11th to 20th	Day	35% 7% 13% 26% 18% 2	2470
	21st to end	Day	27% 7% 13% 30% 21% 3	2470
July	1st to 10th	Day	32% 8% 18% 29% 12% 1	4056
	11th to 20th	Day	22% 6% 12% 36% 23% 2	4051
	21st to end	Day	37% 9% 14% 28% 11%	4325
August	1st to 10th	Day	23% 6% 16% 32% 20% 3	2444
	11th to 20th	Day	31% 6% 15% 28% 17% 3	2431
	21st to end	Day	30% 7% 17% 29% 14% 3	2485
September	1st to 10th	Day	33% 6% 9% 23% 21% 9%	2042
	11th to 20th	Day	35% 7% 10% 21% 20% 8%	1980
	21st to end	Day	27% 5% 10% 21% 25% 11%	1980
October	1st to 10th	Day	30% 4 10% 20% 23% 13%	1846
	11th to 20th	Day	32% 3 6% 15% 28% 16%	1800
	21st to end	Day	38% 3 6% 18% 25% 11%	1980
November	1st to 10th	Day	34% 4 8% 23% 23% 8%	1858
	11th to 20th	Day	31% 4 7% 20% 28% 9%	1849
	21st to end	Day	37% 3 5% 20% 27% 8%	1710
December	1st to 10th	Day	39% 3 7% 26% 20% 5%	1710
	11th to 20th	Day	44% 2 5% 20% 22% 7%	2159
	21st to end	Day	44% 3 4 21% 23% 5%	3135
January	1st to 10th	Night	36% 3 5% 20% 30% 5%	4108
	11th to 20th	Night	30% 3 10% 24% 27% 7%	4120
	21st to end	Night	44% 3 6% 16% 23% 8%	4532
February	1st to 10th	Night	43% 3 7% 19% 21% 7%	2470
	11th to 20th	Night	40% 4 7% 21% 21% 7%	2272
	21st to end	Night	39% 3 7% 17% 22% 12%	1780
March	1st to 10th	Night	46% 3 6% 16% 17% 12%	3419
	11th to 20th	Night	39% 4 7% 24% 16% 10%	3480
	21st to end	Night	41% 3 9% 20% 24% 3	3817
April	1st to 10th	Night	35% 4 9% 20% 19% 12%	2075
	11th to 20th	Night	35% 5% 8% 21% 21% 11%	1875
	21st to end	Night	34% 5% 10% 23% 23% 4	1867
May	1st to 10th	Night	46% 5% 9% 21% 13% 6%	2850
	11th to 20th	Night	35% 5% 13% 26% 18% 3	2824
	21st to end	Night	39% 6% 15% 22% 12% 6%	3099
June	1st to 10th	Night	25% 6% 15% 31% 20% 3	1710
	11th to 20th	Night	22% 5% 11% 33% 24% 5%	1710
	21st to end	Night	18% 5% 12% 30% 29% 5%	1710
July	1st to 10th	Night	26% 7% 18% 30% 16% 3	2805
	11th to 20th	Night	17% 5% 10% 40% 25% 2	2796
	21st to end	Night	29% 7% 16% 29% 19% 1	2999
August	1st to 10th	Night	17% 6% 15% 34% 24% 5%	1691
	11th to 20th	Night	24% 5% 14% 31% 22% 4	1690
	21st to end	Night	26% 6% 15% 29% 20% 4	2079
September	1st to 10th	Night	25% 6% 11% 24% 24% 10%	1914
	11th to 20th	Night	32% 6% 10% 22% 20% 10%	1980
	21st to end	Night	24% 3 8% 23% 27% 14%	1980
October	1st to 10th	Night	24% 4 10% 23% 22% 16%	2096
	11th to 20th	Night	28% 3 6% 17% 28% 19%	2160
	21st to end	Night	34% 3 4 20% 26% 13%	2376
November	1st to 10th	Night	30% 4 8% 21% 26% 12%	2220
	11th to 20th	Night	28% 3 8% 21% 27% 12%	2327
	21st to end	Night	38% 3 7% 19% 27% 7%	2470
December	1st to 10th	Night	34% 4 10% 21% 22% 9%	2470
	11th to 20th	Night	40% 2 6% 17% 25% 10%	3037
	21st to end	Night	40% 3 6% 21% 23% 7%	4532

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	26% 18% 30% 21% 5%	270
	11th to 20th	Day	23% 20% 36% 17% 2 1	270
	21st to end	Day	22% 19% 35% 16% 7% 1	297
February	1st to 10th	Day	31% 16% 31% 18% 4	270
	11th to 20th	Day	31% 20% 33% 11% 4	270
	21st to end	Day	36% 23% 29% 9% 3	225
March	1st to 10th	Day	23% 20% 36% 17% 4	270
	11th to 20th	Day	27% 23% 34% 11% 5%	270
	21st to end	Day	27% 19% 38% 14% 3	297
April	1st to 10th	Day	25% 20% 35% 15% 5%	284
	11th to 20th	Day	28% 14% 30% 21% 7%	452
	21st to end	Day	22% 16% 35% 19% 7% 1	488
May	1st to 10th	Day	18% 13% 35% 27% 7% 1	653
	11th to 20th	Day	16% 8% 31% 31% 12% 2	675
	21st to end	Day	15% 9% 30% 28% 16% 4	734
June	1st to 10th	Day	10% 4 15% 36% 28% 6%	680
	11th to 20th	Day	8% 2 20% 41% 24% 5%	680
	21st to end	Day	5% 2 16% 36% 31% 9%	680
July	1st to 10th	Day	8% 2 13% 31% 36% 11%	671
	11th to 20th	Day	2 2 11% 33% 42% 11%	668
	21st to end	Day	5% 2 8% 35% 37% 13%	739
August	1st to 10th	Day	4 1 8% 38% 41% 8%	676
	11th to 20th	Day	10% 2 9% 39% 34% 6%	665
	21st to end	Day	6% 1 7% 28% 41% 17%	532
September	1st to 10th	Day	7% 1 8% 29% 44% 11%	332
	11th to 20th	Day	4 2 14% 32% 36% 13%	270
	21st to end	Day	13% 4 13% 33% 27% 11%	270
October	1st to 10th	Day	6% 4 25% 38% 21% 6%	270
	11th to 20th	Day	16% 10% 30% 31% 11% 2	270
	21st to end	Day	29% 12% 23% 25% 11% 1	297
November	1st to 10th	Day	21% 9% 31% 25% 12% 1	270
	11th to 20th	Day	17% 13% 34% 25% 9% 1	270
	21st to end	Day	27% 17% 24% 23% 8% 1	270
December	1st to 10th	Day	22% 16% 32% 21% 9% 1	270
	11th to 20th	Day	28% 13% 33% 20% 4	270
	21st to end	Day	22% 22% 36% 15% 5% 1	297
January	1st to 10th	Night	19% 12% 33% 29% 6%	950
	11th to 20th	Night	23% 13% 31% 26% 6%	950
	21st to end	Night	20% 12% 34% 29% 6%	1045
February	1st to 10th	Night	24% 15% 32% 25% 4	950
	11th to 20th	Night	24% 14% 33% 26% 3	797
	21st to end	Night	25% 16% 35% 21% 3	524
March	1st to 10th	Night	23% 12% 33% 29% 4	570
	11th to 20th	Night	20% 12% 35% 28% 5%	570
	21st to end	Night	18% 12% 39% 25% 6%	627
April	1st to 10th	Night	16% 15% 37% 26% 6%	570
	11th to 20th	Night	19% 12% 35% 24% 10%	563
	21st to end	Night	17% 11% 37% 25% 9% 1	570
May	1st to 10th	Night	13% 7% 36% 34% 9% 1	570
	11th to 20th	Night	13% 4 32% 36% 13% 1	561
	21st to end	Night	12% 4 27% 35% 20% 3	617
June	1st to 10th	Night	5% 4 16% 39% 32% 3	570
	11th to 20th	Night	6% 1 19% 51% 21% 2	570
	21st to end	Night	4 2 14% 37% 39% 5%	570
July	1st to 10th	Night	4 1 10% 39% 40% 6%	555
	11th to 20th	Night	3 1 11% 39% 42% 6%	552
	21st to end	Night	3 1 7% 41% 41% 6%	624
August	1st to 10th	Night	3 1 8% 39% 46% 3	567
	11th to 20th	Night	7% 9% 43% 37% 4	564
	21st to end	Night	4 2 6% 42% 40% 7%	624
September	1st to 10th	Night	7% 1 9% 39% 40% 4	540
	11th to 20th	Night	12% 1 10% 38% 36% 3	540
	21st to end	Night	7% 3 17% 37% 32% 4	540
October	1st to 10th	Night	10% 2 19% 41% 26% 3	656
	11th to 20th	Night	15% 5% 26% 36% 15% 1	720
	21st to end	Night	21% 8% 27% 28% 15% 1	792
November	1st to 10th	Night	15% 6% 30% 36% 12%	740
	11th to 20th	Night	13% 11% 30% 34% 11%	807
	21st to end	Night	23% 11% 28% 27% 11%	950
December	1st to 10th	Night	21% 9% 29% 34% 7%	950
	11th to 20th	Night	23% 11% 31% 30% 6%	950
	21st to end	Night	22% 11% 32% 28% 7%	1045

Page generated at 2024-08-27 08:49:40. Version ac07

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