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 2025-04-11.

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% 28%	113631
	Night	21% 13% 5% 11% 5% 4 4 3 4 5% 25%	114689
Transparency	Day	57% 5% 10% 17% 10% 1	117236
	Night	60% 6% 9% 16% 8% 1	119248
Seeing	Day	32% 18% 29% 15% 5% 1	17260
	Night	30% 15% 29% 21% 6%	25194

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	17% 22% 7% 21% 8% 3 3 2 3 3 11%	3184
	11th to 20th	Day	16% 22% 9% 22% 6% 4 3 2 2 3 10%	3955
	21st to end	Day	17% 17% 8% 18% 10% 4 2 2 3 4 15%	4466
February	1st to 10th	Day	19% 20% 7% 13% 8% 6% 4 3 3 5% 13%	1800
	11th to 20th	Day	17% 18% 6% 17% 10% 4 3 3 3 4 16%	1753
	21st to end	Day	13% 17% 6% 12% 8% 4 3 3 4 5% 24%	1594
March	1st to 10th	Day	25% 15% 5% 12% 8% 4 3 3 3 4 18%	4836
	11th to 20th	Day	19% 17% 3 7% 5% 3 4 4 5% 5% 28%	4980
	21st to end	Day	29% 15% 7% 9% 4 4 3 2 3 4 19%	5466
April	1st to 10th	Day	25% 17% 3 6% 4 4 3 3 4 4 28%	2307
	11th to 20th	Day	22% 10% 3 5% 3 4 3 3 5% 6% 36%	2413
	21st to end	Day	24% 11% 2 5% 4 3 3 3 4 6% 34%	2470
May	1st to 10th	Day	22% 12% 4 9% 5% 4 4 3 5% 7% 27%	4106
	11th to 20th	Day	21% 10% 3 7% 5% 4 4 4 6% 7% 30%	4258
	21st to end	Day	20% 8% 3 6% 4 3 4 3 6% 8% 35%	4836
June	1st to 10th	Day	25% 9% 3 6% 4 4 4 3 4 7% 32%	2721
	11th to 20th	Day	23% 7% 3 5% 4 4 4 3 5% 7% 36%	2850
	21st to end	Day	26% 8% 3 7% 4 3 4 3 6% 6% 30%	2850
July	1st to 10th	Day	25% 8% 3 6% 3 3 3 4 5% 7% 32%	4760
	11th to 20th	Day	34% 6% 2 4 3 4 3 3 5% 6% 31%	4483
	21st to end	Day	19% 7% 3 6% 5% 5% 4 4 5% 7% 35%	4467
August	1st to 10th	Day	31% 10% 3 5% 3 3 4 3 4 6% 29%	4105
	11th to 20th	Day	18% 7% 3 7% 5% 5% 5% 3 5% 6% 36%	4045
	21st to end	Day	14% 5% 2 5% 3 2 4 3 6% 7% 49%	4468
September	1st to 10th	Day	18% 6% 2 5% 4 3 4 2 4 6% 46%	2276
	11th to 20th	Day	18% 5% 2 6% 4 3 3 3 4 6% 45%	2090
	21st to end	Day	21% 8% 2 5% 3 3 3 2 4 5% 42%	2090
October	1st to 10th	Day	21% 7% 2 7% 4 4 3 4 6% 6% 37%	1914
	11th to 20th	Day	21% 9% 2 7% 4 5% 4 3 5% 6% 34%	1900
	21st to end	Day	22% 11% 4 9% 4 4 4 3 5% 5% 30%	2054
November	1st to 10th	Day	22% 10% 3 8% 4 4 5% 3 4 6% 32%	1714
	11th to 20th	Day	21% 18% 6% 10% 4 3 4 3 5% 5% 22%	1600
	21st to end	Day	21% 19% 6% 10% 5% 4 4 3 3 5% 19%	1600
December	1st to 10th	Day	23% 17% 9% 13% 4 4 4 3 4 5% 14%	2610
	11th to 20th	Day	27% 15% 4 12% 5% 6% 3 2 4 4 17%	2996
	21st to end	Day	22% 16% 8% 12% 6% 3 3 2 3 4 20%	3614
January	1st to 10th	Night	14% 21% 9% 25% 6% 4 3 2 3 2 11%	6763
	11th to 20th	Night	18% 17% 9% 21% 6% 5% 4 3 4 4 11%	5924
	21st to end	Night	14% 16% 6% 19% 9% 6% 5% 3 4 4 14%	6490
February	1st to 10th	Night	20% 16% 5% 13% 9% 6% 5% 4 5% 4 14%	2600
	11th to 20th	Night	18% 14% 5% 14% 11% 6% 5% 3 4 4 15%	2533
	21st to end	Night	14% 13% 6% 12% 7% 6% 6% 5% 4 5% 22%	2035
March	1st to 10th	Night	24% 15% 6% 11% 9% 4 3 2 3 4 19%	5003
	11th to 20th	Night	20% 16% 6% 7% 5% 4 4 4 5% 5% 24%	4979
	21st to end	Night	30% 13% 5% 8% 3 3 3 2 3 5% 27%	5466
April	1st to 10th	Night	24% 14% 3 6% 5% 4 3 2 5% 5% 29%	2091
	11th to 20th	Night	23% 9% 3 6% 4 3 5% 3 5% 7% 32%	1720
	21st to end	Night	23% 11% 2 6% 4 3 4 3 5% 5% 32%	1710
May	1st to 10th	Night	20% 14% 4 9% 5% 4 4 3 5% 6% 28%	2834
	11th to 20th	Night	20% 12% 3 9% 4 3 4 3 5% 6% 30%	2640
	21st to end	Night	18% 12% 3 8% 5% 3 4 3 5% 7% 32%	2749
June	1st to 10th	Night	27% 10% 3 5% 4 4 4 4 5% 8% 28%	1473
	11th to 20th	Night	19% 10% 2 6% 5% 3 4 3 6% 7% 35%	1330
	21st to end	Night	27% 10% 3 7% 5% 5% 3 4 5% 6% 27%	1330
July	1st to 10th	Night	30% 11% 3 6% 4 3 4 3 5% 6% 24%	2210
	11th to 20th	Night	33% 9% 2 5% 3 3 3 3 6% 7% 25%	2443
	21st to end	Night	18% 7% 3 7% 6% 5% 4 3 6% 7% 34%	3087
August	1st to 10th	Night	35% 9% 2 5% 3 2 3 2 4 6% 28%	2825
	11th to 20th	Night	21% 9% 3 8% 5% 4 4 3 4 7% 31%	2782
	21st to end	Night	13% 8% 2 5% 3 4 3 3 5% 6% 47%	3188
September	1st to 10th	Night	18% 7% 2 4 4 3 3 4 5% 7% 43%	1900
	11th to 20th	Night	20% 6% 2 5% 4 2 4 3 4 7% 44%	2090
	21st to end	Night	22% 8% 3 5% 4 4 3 2 4 7% 38%	2090
October	1st to 10th	Night	21% 8% 2 6% 4 4 3 3 5% 6% 39%	2266
	11th to 20th	Night	18% 9% 3 7% 3 4 4 3 5% 6% 39%	2280
	21st to end	Night	24% 11% 3 7% 4 3 4 3 4 5% 31%	2541
November	1st to 10th	Night	19% 11% 3 7% 5% 3 4 4 5% 6% 32%	2582
	11th to 20th	Night	21% 16% 3 9% 5% 5% 5% 4 5% 5% 22%	2800
	21st to end	Night	20% 16% 5% 10% 5% 4 4 3 5% 5% 23%	2800
December	1st to 10th	Night	18% 19% 7% 15% 5% 4 4 3 5% 5% 15%	4580
	11th to 20th	Night	23% 14% 4 11% 6% 5% 5% 3 4 5% 20%	5213
	21st to end	Night	23% 17% 6% 11% 6% 3 3 2 3 3 23%	7342

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	79% 6% 8% 5% 1	3185
	11th to 20th	Day	80% 6% 6% 7% 2	3988
	21st to end	Day	75% 4 7% 7% 8%	4466
February	1st to 10th	Day	74% 6% 8% 7% 5%	1800
	11th to 20th	Day	73% 5% 7% 10% 4	1761
	21st to end	Day	62% 6% 10% 15% 6% 2	1594
March	1st to 10th	Day	72% 3 8% 11% 5% 1	4840
	11th to 20th	Day	57% 5% 12% 18% 7%	4980
	21st to end	Day	71% 2 5% 13% 9% 1	5466
April	1st to 10th	Day	61% 3 8% 15% 13% 1	2307
	11th to 20th	Day	48% 5% 10% 23% 12% 1	2413
	21st to end	Day	52% 4 9% 18% 15% 2	2470
May	1st to 10th	Day	57% 6% 8% 21% 7% 1	4120
	11th to 20th	Day	52% 6% 13% 19% 8% 1	4262
	21st to end	Day	46% 6% 16% 17% 14% 1	4836
June	1st to 10th	Day	53% 4 9% 21% 11% 1	2721
	11th to 20th	Day	49% 4 11% 20% 14% 2	2850
	21st to end	Day	54% 6% 11% 18% 9% 1	2850
July	1st to 10th	Day	52% 5% 10% 19% 12% 2	4685
	11th to 20th	Day	55% 4 10% 21% 10%	4402
	21st to end	Day	48% 6% 13% 23% 10% 1	4325
August	1st to 10th	Day	58% 4 10% 18% 9% 1	4092
	11th to 20th	Day	48% 7% 13% 25% 8%	4084
	21st to end	Day	34% 5% 12% 26% 20% 3	4468
September	1st to 10th	Day	41% 5% 11% 24% 19% 2	2276
	11th to 20th	Day	41% 4 11% 25% 17% 2	2090
	21st to end	Day	45% 4 7% 23% 18% 2	2090
October	1st to 10th	Day	46% 6% 9% 27% 11% 1	3174
	11th to 20th	Day	45% 4 9% 23% 18% 1	3140
	21st to end	Day	46% 4 11% 25% 12% 3	3368
November	1st to 10th	Day	53% 5% 11% 20% 9% 1	1714
	11th to 20th	Day	63% 6% 10% 15% 6% 1	1600
	21st to end	Day	68% 7% 10% 12% 3	1600
December	1st to 10th	Day	71% 6% 8% 13% 2	2610
	11th to 20th	Day	71% 5% 10% 10% 5%	2995
	21st to end	Day	66% 7% 12% 9% 6%	3614
January	1st to 10th	Night	79% 6% 6% 8% 1	6763
	11th to 20th	Night	76% 6% 7% 9% 2	5966
	21st to end	Night	71% 7% 7% 9% 6%	6490
February	1st to 10th	Night	72% 7% 8% 8% 5%	2600
	11th to 20th	Night	70% 7% 7% 11% 5%	2536
	21st to end	Night	60% 8% 9% 15% 7%	2035
March	1st to 10th	Night	71% 3 6% 10% 9% 1	5012
	11th to 20th	Night	60% 5% 13% 16% 6%	4980
	21st to end	Night	62% 3 6% 17% 10% 1	5466
April	1st to 10th	Night	57% 5% 8% 15% 13% 2	2091
	11th to 20th	Night	51% 7% 8% 22% 12% 1	1720
	21st to end	Night	52% 5% 10% 18% 14% 1	1710
May	1st to 10th	Night	57% 6% 11% 19% 7%	2840
	11th to 20th	Night	54% 7% 11% 21% 7% 1	2641
	21st to end	Night	52% 7% 12% 23% 5%	2750
June	1st to 10th	Night	55% 5% 10% 22% 8% 1	1473
	11th to 20th	Night	49% 6% 12% 20% 12% 1	1330
	21st to end	Night	58% 6% 9% 16% 9% 2	1330
July	1st to 10th	Night	61% 5% 9% 14% 10%	2175
	11th to 20th	Night	58% 6% 11% 14% 10%	2401
	21st to end	Night	48% 7% 11% 21% 12% 1	2989
August	1st to 10th	Night	59% 4 10% 21% 7%	2813
	11th to 20th	Night	51% 7% 14% 22% 6%	2809
	21st to end	Night	37% 6% 12% 27% 18% 1	3187
September	1st to 10th	Night	40% 5% 9% 28% 16% 1	1900
	11th to 20th	Night	42% 4 8% 28% 16% 2	2090
	21st to end	Night	48% 5% 7% 22% 17% 2	2090
October	1st to 10th	Night	48% 5% 11% 21% 14% 1	3786
	11th to 20th	Night	40% 3 12% 24% 20% 1	3779
	21st to end	Night	47% 4 10% 25% 13% 1	4177
November	1st to 10th	Night	51% 7% 13% 20% 9%	2582
	11th to 20th	Night	61% 7% 10% 16% 6%	2800
	21st to end	Night	62% 7% 14% 13% 4	2800
December	1st to 10th	Night	69% 6% 9% 14% 2	4580
	11th to 20th	Night	65% 6% 12% 12% 5%	5215
	21st to end	Night	66% 5% 8% 13% 7% 1	7342

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% 21% 29% 6% 2	200
	11th to 20th	Day	38% 21% 26% 11% 3	367
	21st to end	Day	29% 24% 34% 11% 2	440
February	1st to 10th	Day	38% 20% 30% 10% 2	400
	11th to 20th	Day	40% 27% 21% 10% 2	396
	21st to end	Day	37% 20% 28% 13% 3	387
March	1st to 10th	Day	36% 22% 31% 8% 2	500
	11th to 20th	Day	38% 23% 25% 8% 5% 1	500
	21st to end	Day	35% 24% 26% 10% 5% 1	550
April	1st to 10th	Day	46% 23% 23% 6% 2	500
	11th to 20th	Day	34% 23% 30% 10% 3	452
	21st to end	Day	37% 18% 28% 11% 5% 1	460
May	1st to 10th	Day	37% 24% 27% 9% 2 1	463
	11th to 20th	Day	31% 18% 30% 17% 3 1	586
	21st to end	Day	32% 15% 32% 17% 4 1	735
June	1st to 10th	Day	36% 15% 28% 16% 5% 1	680
	11th to 20th	Day	27% 15% 31% 21% 5% 1	680
	21st to end	Day	36% 13% 27% 18% 6% 1	680
July	1st to 10th	Day	28% 12% 29% 21% 9% 1	670
	11th to 20th	Day	28% 10% 33% 22% 7% 1	617
	21st to end	Day	25% 13% 36% 20% 5% 1	532
August	1st to 10th	Day	23% 12% 37% 20% 7% 1	486
	11th to 20th	Day	24% 11% 35% 19% 10% 2	479
	21st to end	Day	24% 14% 31% 19% 10% 3	539
September	1st to 10th	Day	21% 16% 36% 19% 7% 1	490
	11th to 20th	Day	25% 14% 31% 18% 8% 4	490
	21st to end	Day	25% 15% 33% 17% 7% 3	490
October	1st to 10th	Day	27% 13% 28% 20% 9% 3	397
	11th to 20th	Day	30% 14% 31% 18% 6% 2	390
	21st to end	Day	31% 21% 26% 13% 7% 1	429
November	1st to 10th	Day	31% 19% 28% 16% 6% 1	395
	11th to 20th	Day	40% 19% 26% 12% 4 1	400
	21st to end	Day	36% 23% 28% 10% 3 1	400
December	1st to 10th	Day	38% 20% 28% 12% 3	400
	11th to 20th	Day	45% 22% 21% 10% 3	400
	21st to end	Day	42% 23% 21% 10% 4 1	280
January	1st to 10th	Night	33% 22% 27% 16% 2	890
	11th to 20th	Night	37% 16% 27% 17% 4	800
	21st to end	Night	27% 23% 30% 16% 4	880
February	1st to 10th	Night	36% 17% 29% 16% 2	800
	11th to 20th	Night	35% 23% 24% 15% 3	783
	21st to end	Night	25% 19% 33% 17% 5%	660
March	1st to 10th	Night	29% 20% 32% 17% 3	800
	11th to 20th	Night	29% 19% 29% 18% 5%	800
	21st to end	Night	29% 17% 32% 16% 6%	880
April	1st to 10th	Night	37% 16% 30% 15% 1	691
	11th to 20th	Night	29% 18% 35% 16% 3	567
	21st to end	Night	32% 14% 29% 18% 5%	570
May	1st to 10th	Night	29% 17% 34% 17% 3	570
	11th to 20th	Night	29% 12% 35% 21% 4	562
	21st to end	Night	26% 11% 37% 21% 4 1	616
June	1st to 10th	Night	33% 9% 33% 20% 5%	523
	11th to 20th	Night	23% 9% 33% 29% 5% 1	380
	21st to end	Night	33% 3 32% 25% 7%	380
July	1st to 10th	Night	26% 5% 33% 30% 6%	370
	11th to 20th	Night	24% 9% 34% 24% 9%	453
	21st to end	Night	22% 4 38% 30% 6%	623
August	1st to 10th	Night	23% 7% 31% 30% 8% 1	568
	11th to 20th	Night	26% 7% 27% 31% 9%	562
	21st to end	Night	20% 7% 31% 30% 13% 1	627
September	1st to 10th	Night	22% 8% 31% 29% 10%	570
	11th to 20th	Night	24% 9% 25% 25% 15% 2	760
	21st to end	Night	26% 10% 26% 26% 10% 2	760
October	1st to 10th	Night	27% 10% 24% 27% 11% 1	760
	11th to 20th	Night	26% 14% 28% 23% 9% 1	760
	21st to end	Night	33% 16% 24% 22% 5%	836
November	1st to 10th	Night	28% 13% 29% 22% 8% 1	803
	11th to 20th	Night	34% 16% 25% 19% 6%	900
	21st to end	Night	32% 21% 24% 18% 5%	900
December	1st to 10th	Night	36% 17% 27% 17% 3	900
	11th to 20th	Night	37% 21% 25% 14% 3	900
	21st to end	Night	36% 21% 22% 18% 3	990

Page generated at 2025-04-08 10:17:25. Version ac07

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