Trout Point Lodge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Trout Point Lodge clear sky chart from 2005-11-06 to 2026-08-15.

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	22% 12% 4 9% 5% 4 4 3 4 6% 29%	144250
	Night	21% 13% 5% 11% 5% 4 4 3 4 5% 25%	137722
Transparency	Day	57% 4 10% 18% 10% 1	147813
	Night	60% 5% 9% 16% 8% 1	142248
Seeing	Day	32% 18% 29% 14% 5% 1	19186
	Night	30% 15% 29% 20% 6%	26859

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	16% 21% 9% 21% 9% 4 3 2 3 3 10%	4133
	11th to 20th	Day	19% 23% 10% 21% 5% 4 3 2 2 2 8%	5161
	21st to end	Day	16% 15% 7% 20% 14% 6% 3 2 2 3 12%	5781
February	1st to 10th	Day	18% 19% 7% 14% 8% 6% 4 3 3 5% 13%	1890
	11th to 20th	Day	16% 17% 6% 16% 10% 4 3 3 3 4 17%	1843
	21st to end	Day	13% 17% 7% 11% 8% 4 3 3 4 5% 25%	1671
March	1st to 10th	Day	25% 15% 5% 12% 8% 4 3 3 3 4 19%	4944
	11th to 20th	Day	19% 17% 3 7% 5% 4 4 4 4 6% 28%	5090
	21st to end	Day	29% 15% 7% 9% 4 4 3 2 3 4 20%	5587
April	1st to 10th	Day	25% 16% 3 6% 4 4 3 3 4 4 29%	2422
	11th to 20th	Day	22% 11% 3 5% 3 4 4 3 5% 6% 35%	2670
	21st to end	Day	23% 11% 2 5% 4 3 3 3 5% 6% 35%	2730
May	1st to 10th	Day	29% 12% 3 8% 4 3 3 3 4 5% 26%	7639
	11th to 20th	Day	20% 10% 3 7% 5% 4 4 3 5% 7% 32%	7956
	21st to end	Day	21% 11% 3 7% 4 4 4 3 5% 6% 31%	9059
June	1st to 10th	Day	24% 9% 3 6% 4 4 4 3 4 7% 33%	3007
	11th to 20th	Day	22% 7% 3 5% 4 4 3 3 5% 7% 36%	3150
	21st to end	Day	26% 8% 3 6% 4 4 4 4 6% 6% 31%	3150
July	1st to 10th	Day	26% 8% 2 6% 4 3 4 4 5% 7% 31%	8880
	11th to 20th	Day	25% 6% 2 4 3 3 3 3 5% 7% 38%	8351
	21st to end	Day	18% 6% 2 6% 4 4 4 4 5% 8% 39%	8342
August	1st to 10th	Day	30% 9% 3 5% 3 3 4 3 4 6% 30%	4365
	11th to 20th	Day	17% 7% 3 7% 4 5% 5% 3 5% 6% 37%	4227
	21st to end	Day	14% 5% 2 5% 3 2 4 3 6% 7% 49%	4609
September	1st to 10th	Day	19% 6% 2 5% 4 3 4 2 4 6% 45%	2396
	11th to 20th	Day	17% 5% 2 6% 4 3 3 3 4 6% 46%	2200
	21st to end	Day	21% 8% 2 5% 3 3 4 2 4 5% 43%	2200
October	1st to 10th	Day	20% 7% 2 7% 4 4 3 4 5% 7% 39%	2014
	11th to 20th	Day	21% 10% 2 7% 4 5% 4 3 5% 6% 33%	2000
	21st to end	Day	21% 11% 4 9% 4 4 4 3 5% 5% 30%	2162
November	1st to 10th	Day	22% 11% 3 7% 3 4 5% 3 4 6% 32%	1801
	11th to 20th	Day	21% 19% 6% 10% 4 3 4 3 5% 5% 21%	1680
	21st to end	Day	21% 19% 6% 11% 5% 4 4 3 3 5% 19%	1680
December	1st to 10th	Day	23% 18% 8% 13% 4 4 4 3 4 5% 14%	2690
	11th to 20th	Day	27% 15% 5% 13% 5% 6% 3 2 4 4 17%	3076
	21st to end	Day	21% 16% 8% 13% 6% 3 3 2 3 4 20%	3694
January	1st to 10th	Night	14% 20% 10% 24% 8% 5% 3 2 3 2 9%	8772
	11th to 20th	Night	23% 18% 8% 19% 5% 4 3 2 3 3 10%	7718
	21st to end	Night	13% 15% 6% 22% 11% 7% 4 3 3 3 12%	8400
February	1st to 10th	Night	19% 16% 5% 14% 8% 6% 5% 4 5% 4 14%	2730
	11th to 20th	Night	17% 14% 5% 14% 10% 6% 4 3 4 5% 17%	2663
	21st to end	Night	14% 14% 5% 12% 7% 6% 6% 5% 4 5% 23%	2133
March	1st to 10th	Night	24% 15% 6% 11% 9% 4 3 2 3 4 20%	5115
	11th to 20th	Night	20% 16% 6% 7% 5% 4 4 4 5% 5% 24%	5089
	21st to end	Night	29% 13% 5% 8% 3 3 3 2 3 5% 27%	5587
April	1st to 10th	Night	24% 14% 3 6% 5% 5% 3 2 5% 4 28%	2196
	11th to 20th	Night	24% 10% 2 6% 4 4 5% 3 4 6% 31%	1895
	21st to end	Night	23% 12% 2 6% 4 3 4 3 5% 5% 33%	1890
May	1st to 10th	Night	31% 13% 3 7% 4 3 4 2 4 4 25%	5259
	11th to 20th	Night	22% 13% 3 7% 4 3 4 3 5% 6% 31%	4919
	21st to end	Night	19% 14% 3 7% 4 4 4 3 4 6% 32%	5147
June	1st to 10th	Night	26% 9% 2 5% 4 3 4 4 5% 8% 30%	1628
	11th to 20th	Night	19% 9% 2 6% 5% 3 3 3 6% 7% 35%	1470
	21st to end	Night	26% 10% 3 7% 4 4 4 3 5% 6% 28%	1470
July	1st to 10th	Night	27% 10% 3 7% 4 4 4 4 5% 7% 25%	4110
	11th to 20th	Night	26% 8% 2 6% 3 3 3 3 5% 6% 34%	4561
	21st to end	Night	19% 7% 3 6% 5% 4 3 3 5% 7% 38%	5736
August	1st to 10th	Night	34% 8% 2 5% 3 2 3 2 5% 6% 29%	3005
	11th to 20th	Night	20% 9% 3 8% 5% 4 4 3 4 7% 32%	2909
	21st to end	Night	12% 8% 2 5% 3 4 3 3 5% 6% 47%	3289
September	1st to 10th	Night	19% 7% 2 4 4 3 3 4 5% 8% 42%	2000
	11th to 20th	Night	20% 6% 2 5% 4 3 4 3 4 6% 44%	2200
	21st to end	Night	22% 8% 3 5% 4 4 3 2 4 7% 38%	2200
October	1st to 10th	Night	20% 7% 2 6% 4 4 3 3 5% 6% 40%	2385
	11th to 20th	Night	18% 9% 3 7% 3 4 4 3 5% 6% 38%	2400
	21st to end	Night	24% 11% 3 7% 4 4 4 3 4 5% 31%	2675
November	1st to 10th	Night	20% 11% 3 6% 4 3 4 4 5% 6% 32%	2714
	11th to 20th	Night	20% 17% 3 8% 5% 5% 5% 3 5% 5% 22%	2940
	21st to end	Night	20% 16% 5% 10% 5% 4 4 3 5% 5% 23%	2940
December	1st to 10th	Night	18% 19% 7% 15% 5% 4 4 3 5% 5% 15%	4720
	11th to 20th	Night	23% 15% 5% 11% 6% 5% 5% 3 4 5% 19%	5353
	21st to end	Night	22% 17% 6% 11% 6% 3 3 2 3 3 23%	7504

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	80% 5% 8% 6% 1	4134
	11th to 20th	Day	84% 4 5% 5% 2	5194
	21st to end	Day	79% 4 6% 5% 6%	5781
February	1st to 10th	Day	74% 6% 7% 8% 5%	1890
	11th to 20th	Day	72% 5% 7% 12% 5%	1851
	21st to end	Day	61% 6% 10% 15% 7% 1	1671
March	1st to 10th	Day	71% 3 8% 11% 6% 1	4948
	11th to 20th	Day	57% 5% 12% 18% 7%	5090
	21st to end	Day	70% 2 5% 13% 9% 1	5587
April	1st to 10th	Day	60% 3 8% 15% 13% 1	2422
	11th to 20th	Day	50% 5% 9% 22% 12% 2	2670
	21st to end	Day	51% 4 9% 20% 14% 3	2730
May	1st to 10th	Day	62% 4 8% 18% 8% 1	7651
	11th to 20th	Day	52% 5% 13% 18% 10% 2	7960
	21st to end	Day	54% 4 11% 15% 14% 1	9060
June	1st to 10th	Day	52% 4 10% 21% 12% 1	3007
	11th to 20th	Day	48% 4 11% 20% 14% 2	3150
	21st to end	Day	53% 6% 11% 18% 10% 1	3150
July	1st to 10th	Day	53% 4 12% 20% 10% 1	8805
	11th to 20th	Day	47% 4 10% 26% 13%	8270
	21st to end	Day	44% 5% 13% 24% 13% 1	8159
August	1st to 10th	Day	57% 4 10% 19% 10% 1	4352
	11th to 20th	Day	47% 6% 13% 25% 9%	4266
	21st to end	Day	34% 5% 12% 26% 20% 3	4609
September	1st to 10th	Day	41% 4 10% 24% 19% 2	2396
	11th to 20th	Day	40% 4 11% 25% 18% 2	2200
	21st to end	Day	45% 4 7% 23% 19% 3	2200
October	1st to 10th	Day	45% 5% 10% 28% 11% 1	3274
	11th to 20th	Day	46% 4 9% 22% 18% 1	3240
	21st to end	Day	46% 4 11% 25% 12% 3	3476
November	1st to 10th	Day	54% 5% 11% 20% 9% 1	1801
	11th to 20th	Day	64% 6% 10% 14% 6% 1	1680
	21st to end	Day	68% 6% 10% 12% 3	1680
December	1st to 10th	Day	71% 6% 8% 13% 2	2690
	11th to 20th	Day	71% 5% 9% 10% 5%	3075
	21st to end	Day	66% 7% 11% 9% 6%	3694
January	1st to 10th	Night	81% 5% 6% 7% 1	8772
	11th to 20th	Night	78% 5% 6% 9% 2	7760
	21st to end	Night	76% 5% 6% 8% 5%	8400
February	1st to 10th	Night	72% 6% 8% 9% 5%	2730
	11th to 20th	Night	69% 7% 6% 13% 5%	2666
	21st to end	Night	60% 7% 9% 16% 7%	2133
March	1st to 10th	Night	70% 3 6% 10% 9% 1	5124
	11th to 20th	Night	60% 5% 13% 15% 6%	5090
	21st to end	Night	62% 3 6% 17% 10% 1	5587
April	1st to 10th	Night	58% 5% 8% 15% 13% 2	2196
	11th to 20th	Night	52% 6% 8% 21% 12% 1	1895
	21st to end	Night	52% 5% 10% 18% 14% 1	1890
May	1st to 10th	Night	64% 4 9% 16% 8%	5265
	11th to 20th	Night	55% 5% 10% 20% 9% 2	4920
	21st to end	Night	54% 6% 10% 22% 9%	5148
June	1st to 10th	Night	53% 5% 11% 23% 8% 1	1628
	11th to 20th	Night	48% 6% 12% 21% 12% 1	1470
	21st to end	Night	57% 6% 10% 17% 10% 1	1470
July	1st to 10th	Night	59% 5% 12% 16% 7%	4075
	11th to 20th	Night	52% 4 10% 19% 14% 1	4519
	21st to end	Night	47% 5% 10% 23% 13% 2	5605
August	1st to 10th	Night	58% 4 10% 21% 8%	2993
	11th to 20th	Night	51% 7% 15% 22% 6%	2936
	21st to end	Night	37% 6% 12% 27% 17% 1	3288
September	1st to 10th	Night	41% 5% 9% 27% 16% 2	2000
	11th to 20th	Night	41% 4 8% 28% 17% 2	2200
	21st to end	Night	48% 5% 7% 22% 17% 2	2200
October	1st to 10th	Night	47% 5% 12% 21% 15% 1	3905
	11th to 20th	Night	41% 3 12% 24% 19% 1	3899
	21st to end	Night	47% 4 10% 25% 13% 1	4311
November	1st to 10th	Night	51% 7% 13% 20% 10%	2714
	11th to 20th	Night	61% 7% 10% 15% 6%	2940
	21st to end	Night	62% 7% 14% 13% 4	2940
December	1st to 10th	Night	69% 6% 8% 14% 2	4720
	11th to 20th	Night	65% 6% 12% 12% 5%	5355
	21st to end	Night	66% 5% 8% 13% 7% 1	7504

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	43% 22% 28% 6% 2	220
	11th to 20th	Day	40% 21% 26% 11% 3	396
	21st to end	Day	30% 25% 33% 11% 1	473
February	1st to 10th	Day	36% 20% 31% 10% 3	430
	11th to 20th	Day	38% 26% 22% 11% 2	426
	21st to end	Day	36% 22% 27% 12% 2	416
March	1st to 10th	Day	35% 23% 32% 8% 2	540
	11th to 20th	Day	40% 23% 24% 8% 4 1	540
	21st to end	Day	37% 23% 25% 9% 4 1	594
April	1st to 10th	Day	45% 24% 23% 6% 2	540
	11th to 20th	Day	39% 22% 29% 8% 2	532
	21st to end	Day	35% 20% 29% 10% 5% 1	540
May	1st to 10th	Day	38% 23% 27% 8% 2 1	543
	11th to 20th	Day	32% 20% 29% 15% 3 1	677
	21st to end	Day	33% 17% 31% 16% 4	845
June	1st to 10th	Day	34% 15% 28% 17% 5% 1	780
	11th to 20th	Day	28% 17% 29% 21% 5% 1	780
	21st to end	Day	34% 14% 28% 18% 5% 1	780
July	1st to 10th	Day	29% 12% 31% 20% 8% 1	770
	11th to 20th	Day	28% 12% 31% 22% 7% 1	711
	21st to end	Day	25% 12% 38% 20% 5% 1	620
August	1st to 10th	Day	21% 11% 39% 20% 7% 1	566
	11th to 20th	Day	24% 11% 34% 19% 10% 2	535
	21st to end	Day	23% 16% 31% 19% 9% 3	583
September	1st to 10th	Day	21% 16% 35% 19% 7% 2	530
	11th to 20th	Day	24% 15% 32% 18% 8% 4	530
	21st to end	Day	24% 16% 33% 17% 7% 3	530
October	1st to 10th	Day	26% 14% 29% 20% 8% 3	427
	11th to 20th	Day	30% 14% 30% 18% 5% 2	420
	21st to end	Day	32% 21% 26% 13% 7% 1	462
November	1st to 10th	Day	33% 19% 26% 16% 5% 1	425
	11th to 20th	Day	39% 19% 26% 12% 4 1	430
	21st to end	Day	37% 21% 28% 10% 4	430
December	1st to 10th	Day	39% 20% 27% 11% 2	430
	11th to 20th	Day	45% 22% 21% 9% 3	430
	21st to end	Day	43% 23% 22% 9% 3 1	305
January	1st to 10th	Night	33% 22% 27% 15% 2	939
	11th to 20th	Night	38% 16% 26% 16% 4	840
	21st to end	Night	28% 23% 30% 15% 3	924
February	1st to 10th	Night	35% 16% 29% 17% 2	840
	11th to 20th	Night	33% 23% 24% 16% 3	823
	21st to end	Night	25% 19% 34% 17% 5%	692
March	1st to 10th	Night	29% 20% 32% 17% 2	840
	11th to 20th	Night	29% 19% 28% 18% 5%	840
	21st to end	Night	29% 17% 32% 16% 6%	924
April	1st to 10th	Night	38% 16% 30% 15% 1	726
	11th to 20th	Night	31% 17% 35% 15% 2	624
	21st to end	Night	32% 14% 30% 19% 5%	630
May	1st to 10th	Night	31% 16% 33% 16% 3	630
	11th to 20th	Night	30% 13% 34% 20% 4	622
	21st to end	Night	26% 13% 36% 20% 4 1	682
June	1st to 10th	Night	32% 9% 34% 21% 5%	578
	11th to 20th	Night	24% 10% 32% 29% 5% 1	420
	21st to end	Night	32% 4 32% 26% 6%	420
July	1st to 10th	Night	26% 7% 32% 29% 6%	410
	11th to 20th	Night	24% 9% 34% 23% 9%	503
	21st to end	Night	23% 5% 36% 30% 6%	689
August	1st to 10th	Night	22% 7% 31% 31% 9% 1	628
	11th to 20th	Night	25% 7% 27% 31% 9%	605
	21st to end	Night	19% 7% 32% 30% 12% 1	660
September	1st to 10th	Night	22% 8% 30% 30% 10%	600
	11th to 20th	Night	23% 10% 25% 25% 15% 2	800
	21st to end	Night	26% 10% 26% 27% 10% 2	800
October	1st to 10th	Night	27% 10% 24% 27% 11% 1	800
	11th to 20th	Night	26% 14% 27% 24% 9% 1	800
	21st to end	Night	33% 16% 23% 22% 5%	880
November	1st to 10th	Night	29% 13% 28% 22% 7% 1	845
	11th to 20th	Night	34% 16% 26% 19% 6%	950
	21st to end	Night	32% 21% 24% 17% 5%	950
December	1st to 10th	Night	36% 17% 27% 17% 3	950
	11th to 20th	Night	38% 21% 25% 14% 3	950
	21st to end	Night	35% 21% 23% 18% 3	1045

Page generated at 2026-08-12 04:37:20. Version ac07

Copyright © 2026 Attilla Danko.