Carlyle Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Carlyle Lake clear sky chart from 2005-11-06 to 2024-09-14.

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	12% 7% 3 6% 4 4 4 4 6% 8% 42%	100664
	Night	14% 8% 3 6% 4 4 4 3 5% 6% 43%	97301
Transparency	Day	39% 7% 12% 25% 14% 2	100453
	Night	41% 6% 11% 24% 16% 2	97184
Seeing	Day	15% 9% 24% 26% 19% 7%	15432
	Night	16% 8% 28% 31% 15% 2	25204

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	13% 10% 5% 10% 5% 4 4 4 5% 7% 33%	2527
	11th to 20th	Day	14% 10% 4 7% 5% 8% 6% 6% 4 5% 31%	2594
	21st to end	Day	25% 15% 5% 7% 4 3 3 2 3 4 28%	3135
February	1st to 10th	Day	17% 11% 5% 6% 3 4 5% 3 5% 6% 36%	1771
	11th to 20th	Day	15% 10% 3 7% 6% 3 4 4 5% 6% 37%	1848
	21st to end	Day	15% 9% 4 8% 4 4 4 4 5% 6% 37%	1570
March	1st to 10th	Day	20% 13% 3 6% 3 3 3 2 3 6% 37%	3120
	11th to 20th	Day	12% 7% 3 5% 4 3 4 4 5% 7% 47%	3375
	21st to end	Day	14% 9% 2 8% 5% 5% 5% 4 6% 7% 35%	4120
April	1st to 10th	Day	13% 6% 2 6% 5% 4 3 4 6% 9% 42%	2280
	11th to 20th	Day	16% 8% 3 6% 4 4 5% 3 4 6% 42%	2254
	21st to end	Day	16% 7% 3 6% 5% 5% 5% 3 5% 6% 40%	2280
May	1st to 10th	Day	14% 7% 2 6% 6% 6% 5% 4 7% 10% 33%	4004
	11th to 20th	Day	17% 8% 3 6% 4 4 4 3 5% 7% 40%	4192
	21st to end	Day	9% 5% 2 6% 5% 5% 5% 4 6% 8% 45%	4824
June	1st to 10th	Day	8% 5% 2 5% 4 5% 5% 5% 7% 8% 47%	2660
	11th to 20th	Day	7% 4 2 6% 5% 4 4 4 6% 8% 50%	2660
	21st to end	Day	5% 4 2 6% 4 5% 5% 5% 8% 10% 46%	2660
July	1st to 10th	Day	12% 5% 2 6% 4 5% 5% 4 7% 9% 42%	4440
	11th to 20th	Day	5% 4 1 5% 5% 5% 5% 4 7% 11% 48%	4440
	21st to end	Day	7% 6% 2 7% 5% 6% 5% 5% 8% 10% 39%	4757
August	1st to 10th	Day	6% 4 2 4 4 4 4 4 6% 10% 53%	3954
	11th to 20th	Day	10% 5% 2 5% 4 4 5% 4 7% 10% 43%	3729
	21st to end	Day	5% 4 2 5% 4 4 4 4 6% 9% 54%	4180
September	1st to 10th	Day	12% 6% 2 5% 4 3 4 3 4 7% 49%	2280
	11th to 20th	Day	7% 5% 2 6% 4 4 4 3 6% 8% 49%	2121
	21st to end	Day	9% 4 1 6% 4 4 4 3 6% 6% 53%	1980
October	1st to 10th	Day	10% 5% 1 5% 4 3 4 2 4 7% 55%	1887
	11th to 20th	Day	14% 6% 2 5% 3 3 4 3 5% 7% 49%	1800
	21st to end	Day	18% 7% 2 6% 3 3 4 2 4 6% 46%	1890
November	1st to 10th	Day	9% 6% 1 5% 3 3 3 3 5% 6% 55%	1672
	11th to 20th	Day	14% 8% 3 6% 4 3 4 3 5% 5% 45%	1710
	21st to end	Day	16% 9% 3 7% 5% 3 3 4 4 5% 40%	1710
December	1st to 10th	Day	14% 12% 3 7% 4 5% 4 3 5% 6% 37%	1539
	11th to 20th	Day	15% 11% 4 6% 4 5% 5% 3 4 7% 36%	1918
	21st to end	Day	22% 15% 4 9% 5% 4 4 3 4 5% 25%	2783
January	1st to 10th	Night	16% 11% 6% 9% 4 4 3 3 5% 5% 34%	4428
	11th to 20th	Night	13% 14% 6% 11% 5% 5% 7% 3 3 3 29%	4372
	21st to end	Night	25% 15% 6% 9% 3 3 3 2 4 4 27%	4532
February	1st to 10th	Night	17% 11% 5% 8% 5% 4 3 5% 4 5% 34%	2407
	11th to 20th	Night	15% 8% 3 7% 5% 4 3 3 6% 6% 40%	2218
	21st to end	Night	17% 9% 3 9% 5% 4 4 3 5% 5% 38%	1884
March	1st to 10th	Night	20% 12% 2 6% 4 4 4 3 3 5% 38%	3733
	11th to 20th	Night	14% 6% 2 5% 3 3 3 3 4 6% 51%	3613
	21st to end	Night	18% 8% 3 7% 5% 4 4 3 5% 7% 36%	3509
April	1st to 10th	Night	13% 6% 2 6% 4 4 4 3 5% 5% 47%	1900
	11th to 20th	Night	16% 6% 2 5% 4 4 4 4 5% 8% 43%	1875
	21st to end	Night	19% 7% 3 7% 4 4 4 4 4 6% 40%	1900
May	1st to 10th	Night	16% 8% 2 6% 4 4 4 4 5% 8% 37%	2890
	11th to 20th	Night	15% 7% 2 6% 4 4 4 4 5% 6% 43%	2702
	21st to end	Night	10% 6% 2 6% 5% 4 5% 4 7% 9% 41%	2743
June	1st to 10th	Night	9% 5% 2 5% 4 4 4 3 5% 9% 50%	1520
	11th to 20th	Night	5% 4 2 5% 4 4 4 3 6% 8% 53%	1520
	21st to end	Night	6% 4 2 4 4 5% 5% 5% 7% 10% 49%	1520
July	1st to 10th	Night	13% 4 1 5% 3 3 4 4 5% 9% 48%	2530
	11th to 20th	Night	5% 4 2 5% 3 4 4 4 6% 7% 56%	2530
	21st to end	Night	7% 5% 3 7% 6% 5% 7% 5% 7% 10% 39%	2802
August	1st to 10th	Night	6% 3 1 5% 3 4 4 4 7% 9% 56%	2980
	11th to 20th	Night	9% 4 2 6% 3 4 5% 4 6% 8% 49%	3100
	21st to end	Night	6% 3 1 4 3 3 4 4 6% 9% 58%	3476
September	1st to 10th	Night	10% 5% 1 5% 4 3 3 3 4 6% 54%	1900
	11th to 20th	Night	8% 6% 2 5% 3 3 4 3 5% 7% 54%	1898
	21st to end	Night	10% 5% 2 4 4 4 3 4 4 7% 54%	1980
October	1st to 10th	Night	8% 5% 2 5% 3 3 4 3 4 7% 57%	2070
	11th to 20th	Night	15% 5% 2 5% 3 3 3 3 3 5% 54%	2160
	21st to end	Night	20% 7% 2 5% 3 3 3 3 4 5% 45%	2464
November	1st to 10th	Night	10% 6% 2 5% 3 3 3 3 4 5% 55%	2406
	11th to 20th	Night	14% 6% 3 5% 3 4 3 3 5% 7% 48%	2470
	21st to end	Night	20% 8% 3 6% 3 2 3 2 4 6% 43%	2470
December	1st to 10th	Night	17% 11% 3 7% 5% 4 3 3 6% 6% 35%	2636
	11th to 20th	Night	17% 8% 4 6% 3 4 4 3 4 6% 41%	3279
	21st to end	Night	24% 17% 4 8% 5% 4 4 3 4 5% 22%	4884

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	48% 7% 11% 24% 8% 1	2528
	11th to 20th	Day	50% 6% 13% 20% 11%	2594
	21st to end	Day	61% 4 8% 17% 9% 1	3135
February	1st to 10th	Day	50% 4 11% 23% 10% 1	1771
	11th to 20th	Day	48% 5% 10% 22% 13% 3	1858
	21st to end	Day	47% 5% 10% 20% 14% 3	1570
March	1st to 10th	Day	50% 5% 7% 21% 13% 4	3120
	11th to 20th	Day	36% 6% 13% 26% 15% 4	3375
	21st to end	Day	44% 10% 16% 22% 8% 1	4120
April	1st to 10th	Day	37% 8% 13% 25% 16% 1	2280
	11th to 20th	Day	43% 6% 10% 24% 14% 3	2254
	21st to end	Day	45% 7% 11% 24% 11% 2	2280
May	1st to 10th	Day	42% 12% 15% 23% 7%	4041
	11th to 20th	Day	44% 8% 11% 27% 10% 1	4196
	21st to end	Day	34% 10% 12% 22% 21% 1	4837
June	1st to 10th	Day	31% 9% 14% 27% 16% 3	2660
	11th to 20th	Day	30% 8% 13% 24% 22% 3	2660
	21st to end	Day	30% 10% 16% 23% 16% 5%	2660
July	1st to 10th	Day	36% 8% 11% 29% 13% 3	4371
	11th to 20th	Day	27% 9% 14% 32% 16% 2	4365
	21st to end	Day	36% 10% 17% 24% 12% 1	4607
August	1st to 10th	Day	26% 7% 13% 38% 15% 1	3940
	11th to 20th	Day	34% 8% 14% 26% 17% 1	3765
	21st to end	Day	26% 7% 14% 35% 15% 3	4179
September	1st to 10th	Day	35% 6% 11% 24% 20% 4	2280
	11th to 20th	Day	32% 6% 10% 25% 24% 3	2121
	21st to end	Day	31% 5% 10% 25% 25% 4	1980
October	1st to 10th	Day	30% 5% 11% 26% 25% 3	1887
	11th to 20th	Day	35% 5% 10% 24% 22% 5%	1800
	21st to end	Day	40% 4 9% 27% 16% 3	1890
November	1st to 10th	Day	31% 5% 13% 28% 18% 6%	1672
	11th to 20th	Day	40% 5% 10% 23% 18% 5%	1710
	21st to end	Day	47% 5% 8% 25% 14% 1	1710
December	1st to 10th	Day	47% 6% 12% 22% 12% 1	1539
	11th to 20th	Day	47% 6% 9% 25% 11% 2	1915
	21st to end	Day	61% 5% 11% 14% 7% 2	2783
January	1st to 10th	Night	51% 5% 12% 22% 9% 1	4428
	11th to 20th	Night	57% 6% 9% 18% 8% 1	4372
	21st to end	Night	61% 5% 9% 17% 7% 1	4532
February	1st to 10th	Night	51% 5% 10% 21% 11% 1	2407
	11th to 20th	Night	44% 4 12% 21% 17% 2	2219
	21st to end	Night	49% 5% 10% 20% 13% 3	1884
March	1st to 10th	Night	48% 6% 8% 22% 15% 2	3733
	11th to 20th	Night	34% 6% 12% 23% 22% 3	3613
	21st to end	Night	45% 9% 11% 27% 7% 1	3509
April	1st to 10th	Night	38% 6% 10% 26% 17% 3	1900
	11th to 20th	Night	39% 5% 10% 23% 19% 3	1875
	21st to end	Night	45% 7% 10% 22% 14% 3	1900
May	1st to 10th	Night	42% 11% 16% 20% 10% 1	2918
	11th to 20th	Night	39% 9% 12% 26% 14% 1	2703
	21st to end	Night	35% 11% 12% 23% 17% 2	2751
June	1st to 10th	Night	31% 8% 14% 23% 21% 3	1520
	11th to 20th	Night	26% 7% 12% 25% 24% 5%	1520
	21st to end	Night	27% 9% 15% 24% 18% 7%	1520
July	1st to 10th	Night	33% 6% 11% 28% 19% 4	2490
	11th to 20th	Night	24% 7% 12% 35% 19% 3	2482
	21st to end	Night	37% 9% 18% 22% 12% 2	2713
August	1st to 10th	Night	23% 8% 17% 34% 18% 1	2970
	11th to 20th	Night	32% 8% 12% 25% 22% 1	3130
	21st to end	Night	22% 7% 14% 34% 20% 3	3476
September	1st to 10th	Night	31% 5% 9% 28% 21% 7%	1900
	11th to 20th	Night	30% 5% 9% 29% 22% 5%	1898
	21st to end	Night	29% 7% 8% 22% 28% 6%	1980
October	1st to 10th	Night	28% 5% 10% 25% 26% 6%	2070
	11th to 20th	Night	33% 4 8% 25% 23% 6%	2160
	21st to end	Night	42% 5% 8% 22% 19% 4	2464
November	1st to 10th	Night	32% 4 11% 24% 23% 5%	2406
	11th to 20th	Night	36% 4 10% 24% 22% 4	2470
	21st to end	Night	44% 3 9% 24% 18% 1	2470
December	1st to 10th	Night	49% 5% 11% 22% 12% 1	2636
	11th to 20th	Night	44% 5% 11% 25% 15% 1	3281
	21st to end	Night	63% 7% 9% 14% 7% 1	4884

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	25% 17% 29% 22% 7%	270
	11th to 20th	Day	28% 18% 30% 21% 2	270
	21st to end	Day	24% 19% 34% 18% 5%	297
February	1st to 10th	Day	30% 12% 37% 17% 3	270
	11th to 20th	Day	26% 21% 29% 19% 4 1	270
	21st to end	Day	28% 19% 32% 19% 2	225
March	1st to 10th	Day	20% 17% 43% 16% 4	270
	11th to 20th	Day	27% 16% 38% 14% 5%	270
	21st to end	Day	28% 14% 32% 21% 5%	474
April	1st to 10th	Day	17% 15% 33% 25% 9% 1	460
	11th to 20th	Day	20% 17% 27% 22% 12% 2	452
	21st to end	Day	18% 15% 36% 20% 10% 2	460
May	1st to 10th	Day	17% 14% 27% 30% 9% 2	463
	11th to 20th	Day	16% 9% 24% 28% 18% 5%	546
	21st to end	Day	9% 6% 29% 30% 18% 9%	734
June	1st to 10th	Day	9% 4 18% 30% 27% 11%	680
	11th to 20th	Day	8% 2 19% 34% 28% 9%	680
	21st to end	Day	6% 6% 23% 35% 23% 7%	680
July	1st to 10th	Day	11% 3 12% 27% 28% 20%	671
	11th to 20th	Day	6% 3 12% 35% 30% 13%	668
	21st to end	Day	8% 1 12% 33% 33% 12%	739
August	1st to 10th	Day	8% 2 12% 32% 32% 14%	591
	11th to 20th	Day	10% 3 15% 29% 30% 13%	479
	21st to end	Day	9% 1 11% 26% 36% 17%	539
September	1st to 10th	Day	11% 3 17% 25% 29% 15%	490
	11th to 20th	Day	8% 3 10% 28% 37% 14%	463
	21st to end	Day	10% 6% 21% 27% 24% 12%	450
October	1st to 10th	Day	11% 6% 22% 36% 20% 4	357
	11th to 20th	Day	15% 15% 33% 24% 11% 1	270
	21st to end	Day	28% 16% 28% 20% 8%	297
November	1st to 10th	Day	13% 9% 36% 22% 15% 6%	270
	11th to 20th	Day	19% 17% 30% 20% 10% 3	270
	21st to end	Day	24% 13% 32% 21% 8% 2	270
December	1st to 10th	Day	14% 19% 39% 16% 5% 6%	270
	11th to 20th	Day	22% 15% 33% 22% 6% 1	270
	21st to end	Day	27% 19% 35% 16% 4	297
January	1st to 10th	Night	20% 14% 37% 24% 5%	950
	11th to 20th	Night	22% 17% 34% 23% 4	950
	21st to end	Night	21% 14% 38% 25% 2	1045
February	1st to 10th	Night	21% 12% 40% 25% 2	887
	11th to 20th	Night	20% 16% 38% 24% 2	743
	21st to end	Night	24% 15% 38% 22% 2	628
March	1st to 10th	Night	20% 15% 38% 23% 4	760
	11th to 20th	Night	22% 12% 34% 26% 6%	651
	21st to end	Night	23% 9% 33% 28% 7%	627
April	1st to 10th	Night	16% 13% 36% 28% 6%	570
	11th to 20th	Night	18% 9% 33% 29% 11% 1	563
	21st to end	Night	21% 7% 36% 26% 8% 1	570
May	1st to 10th	Night	17% 7% 30% 35% 11%	570
	11th to 20th	Night	11% 6% 27% 35% 18% 2	561
	21st to end	Night	10% 3 22% 39% 23% 3	617
June	1st to 10th	Night	10% 3 18% 41% 26% 2	570
	11th to 20th	Night	7% 2 17% 47% 25% 2	570
	21st to end	Night	6% 2 20% 42% 28% 1	570
July	1st to 10th	Night	11% 2 8% 34% 37% 8%	555
	11th to 20th	Night	5% 2 13% 40% 36% 3	552
	21st to end	Night	5% 1 12% 41% 36% 4	624
August	1st to 10th	Night	8% 2 10% 41% 35% 5%	567
	11th to 20th	Night	7% 1 14% 39% 34% 5%	564
	21st to end	Night	8% 1 8% 36% 43% 4	627
September	1st to 10th	Night	11% 2 14% 36% 32% 6%	570
	11th to 20th	Night	9% 2 14% 37% 33% 6%	610
	21st to end	Night	11% 5% 21% 32% 26% 6%	720
October	1st to 10th	Night	9% 4 24% 36% 23% 4	720
	11th to 20th	Night	16% 9% 29% 32% 14% 1	720
	21st to end	Night	23% 10% 30% 29% 7%	792
November	1st to 10th	Night	12% 6% 36% 34% 10% 1	740
	11th to 20th	Night	16% 11% 34% 29% 10% 1	760
	21st to end	Night	24% 10% 33% 26% 8%	760
December	1st to 10th	Night	21% 13% 34% 26% 6%	926
	11th to 20th	Night	24% 7% 33% 31% 5%	950
	21st to end	Night	27% 14% 35% 21% 4	1045

Page generated at 2024-09-11 09:00:01. Version ac07

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