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 2024-10-24.

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% 11% 4 8% 5% 4 4 3 4 6% 29%	101565
	Night	22% 12% 4 10% 5% 4 4 3 4 5% 26%	97212
Transparency	Day	56% 5% 10% 18% 10% 1	101323
	Night	59% 6% 10% 17% 8% 1	97074
Seeing	Day	32% 18% 29% 15% 5% 1	16725
	Night	30% 15% 29% 21% 6%	24459

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	20% 17% 6% 16% 8% 4 4 3 4 4 15%	2221
	11th to 20th	Day	20% 18% 7% 18% 7% 5% 3 2 3 4 13%	2782
	21st to end	Day	21% 14% 7% 17% 7% 4 3 2 3 4 17%	3124
February	1st to 10th	Day	19% 20% 7% 13% 8% 6% 4 3 3 4 13%	1710
	11th to 20th	Day	17% 19% 6% 15% 11% 4 3 3 3 4 16%	1663
	21st to end	Day	13% 17% 6% 11% 8% 4 3 3 4 5% 24%	1516
March	1st to 10th	Day	26% 16% 4 9% 6% 4 3 3 3 4 22%	3364
	11th to 20th	Day	18% 20% 4 9% 6% 4 3 3 4 5% 23%	3480
	21st to end	Day	31% 14% 6% 10% 4 4 3 2 3 3 20%	3816
April	1st to 10th	Day	25% 17% 3 6% 5% 4 3 3 4 4 28%	2191
	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 8% 5% 4 4 3 4 5% 30%	1976
November	1st to 10th	Day	22% 10% 3 7% 4 4 5% 3 4 6% 32%	1627
	11th to 20th	Day	20% 17% 5% 10% 4 4 4 3 5% 5% 23%	1520
	21st to end	Day	21% 18% 6% 11% 5% 4 4 3 3 5% 19%	1520
December	1st to 10th	Day	25% 20% 5% 11% 5% 4 4 3 3 4 16%	1520
	11th to 20th	Day	27% 17% 6% 12% 5% 6% 4 2 5% 4 12%	1906
	21st to end	Day	23% 16% 9% 13% 6% 4 3 2 3 4 16%	2527
January	1st to 10th	Night	17% 15% 6% 23% 7% 5% 4 3 3 3 14%	4717
	11th to 20th	Night	20% 18% 7% 19% 6% 5% 3 3 3 4 12%	4172
	21st to end	Night	19% 15% 6% 17% 7% 6% 5% 4 3 4 15%	4532
February	1st to 10th	Night	20% 16% 5% 13% 9% 6% 5% 4 5% 4 14%	2470
	11th to 20th	Night	18% 15% 5% 13% 11% 6% 5% 3 4 4 15%	2403
	21st to end	Night	13% 13% 6% 12% 7% 7% 6% 5% 4 6% 22%	1937
March	1st to 10th	Night	23% 13% 4 10% 8% 4 3 2 3 5% 24%	3475
	11th to 20th	Night	17% 18% 5% 8% 6% 5% 4 4 5% 6% 22%	3479
	21st to end	Night	31% 11% 5% 10% 4 3 2 2 3 4 25%	3816
April	1st to 10th	Night	23% 14% 3 6% 4 4 4 2 6% 5% 28%	1987
	11th to 20th	Night	23% 9% 3 6% 4 4 5% 3 5% 6% 32%	1713
	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	25% 12% 3 7% 4 3 4 3 4 5% 30%	2444
November	1st to 10th	Night	20% 11% 3 7% 5% 3 4 4 5% 6% 31%	2449
	11th to 20th	Night	21% 14% 3 9% 5% 5% 5% 4 5% 6% 23%	2660
	21st to end	Night	20% 15% 5% 10% 5% 4 4 3 5% 5% 23%	2660
December	1st to 10th	Night	26% 17% 5% 11% 5% 4 4 3 5% 5% 15%	2660
	11th to 20th	Night	27% 15% 5% 11% 6% 4 4 3 4 5% 16%	3293
	21st to end	Night	23% 16% 7% 12% 5% 4 4 3 3 3 20%	5118

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	70% 9% 12% 8% 2	2222
	11th to 20th	Day	74% 7% 8% 8% 3	2782
	21st to end	Day	71% 6% 8% 9% 6%	3124
February	1st to 10th	Day	75% 6% 8% 7% 5%	1710
	11th to 20th	Day	73% 5% 6% 11% 4	1671
	21st to end	Day	62% 6% 10% 15% 6% 2	1516
March	1st to 10th	Day	66% 3 8% 15% 5% 2	3368
	11th to 20th	Day	61% 6% 9% 15% 8% 1	3480
	21st to end	Day	71% 2 5% 12% 8% 1	3816
April	1st to 10th	Day	60% 3 8% 15% 12% 1	2191
	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% 5% 10% 26% 12% 1	1914
	11th to 20th	Day	50% 6% 11% 22% 11%	1900
	21st to end	Day	56% 5% 9% 18% 11% 1	1976
November	1st to 10th	Day	53% 5% 11% 20% 9% 1	1627
	11th to 20th	Day	62% 7% 10% 15% 6%	1520
	21st to end	Day	67% 7% 10% 13% 3	1520
December	1st to 10th	Day	72% 6% 8% 12% 3	1520
	11th to 20th	Day	74% 6% 7% 8% 4	1905
	21st to end	Day	70% 8% 13% 7% 2	2527
January	1st to 10th	Night	72% 8% 7% 10% 2	4717
	11th to 20th	Night	75% 7% 7% 9% 3	4172
	21st to end	Night	71% 8% 7% 10% 4	4532
February	1st to 10th	Night	71% 7% 8% 9% 5%	2470
	11th to 20th	Night	70% 7% 6% 11% 5%	2406
	21st to end	Night	61% 8% 9% 15% 7% 1	1937
March	1st to 10th	Night	65% 5% 7% 13% 9% 1	3484
	11th to 20th	Night	61% 7% 12% 12% 7%	3480
	21st to end	Night	65% 4 7% 15% 9% 2	3816
April	1st to 10th	Night	57% 5% 8% 15% 12% 2	1987
	11th to 20th	Night	51% 7% 8% 21% 12% 1	1713
	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	46% 5% 11% 22% 14% 2	2266
	11th to 20th	Night	45% 5% 13% 24% 12%	2280
	21st to end	Night	56% 6% 9% 19% 10% 1	2444
November	1st to 10th	Night	52% 7% 12% 19% 9%	2449
	11th to 20th	Night	60% 8% 11% 16% 6%	2660
	21st to end	Night	62% 7% 14% 13% 4	2660
December	1st to 10th	Night	70% 6% 9% 12% 3	2660
	11th to 20th	Night	70% 7% 8% 12% 4	3295
	21st to end	Night	67% 7% 10% 13% 3	5118

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	42% 21% 28% 6% 2	180
	11th to 20th	Day	38% 22% 26% 10% 3	338
	21st to end	Day	28% 23% 35% 12% 2	407
February	1st to 10th	Day	37% 19% 31% 11% 2	370
	11th to 20th	Day	39% 27% 21% 10% 2	366
	21st to end	Day	36% 20% 28% 13% 3	357
March	1st to 10th	Day	35% 22% 31% 8% 3	460
	11th to 20th	Day	39% 23% 23% 8% 5% 1	460
	21st to end	Day	35% 24% 26% 10% 5% 1	506
April	1st to 10th	Day	44% 23% 23% 7% 2	460
	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	32% 21% 26% 13% 7% 1	405
November	1st to 10th	Day	31% 17% 28% 16% 6% 1	365
	11th to 20th	Day	38% 18% 27% 12% 4 1	370
	21st to end	Day	35% 22% 29% 10% 3 1	370
December	1st to 10th	Day	38% 20% 27% 11% 2	370
	11th to 20th	Day	45% 22% 21% 10% 2	370
	21st to end	Day	44% 22% 21% 9% 4 1	255
January	1st to 10th	Night	33% 22% 27% 16% 2	841
	11th to 20th	Night	37% 16% 27% 16% 3	760
	21st to end	Night	27% 22% 31% 16% 4	836
February	1st to 10th	Night	35% 16% 30% 17% 2	760
	11th to 20th	Night	34% 23% 23% 16% 3	743
	21st to end	Night	25% 20% 33% 17% 5%	628
March	1st to 10th	Night	29% 19% 32% 17% 3	760
	11th to 20th	Night	29% 19% 28% 18% 5%	760
	21st to end	Night	28% 17% 32% 17% 6%	836
April	1st to 10th	Night	36% 16% 30% 16% 1	657
	11th to 20th	Night	29% 18% 35% 15% 3	564
	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%	805
November	1st to 10th	Night	28% 13% 27% 23% 8% 1	760
	11th to 20th	Night	32% 16% 26% 20% 6%	850
	21st to end	Night	31% 21% 24% 18% 5%	850
December	1st to 10th	Night	37% 16% 27% 17% 3	850
	11th to 20th	Night	38% 20% 25% 14% 3	850
	21st to end	Night	36% 21% 22% 18% 3	935

Page generated at 2024-10-21 03:20:02. Version ac07

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