Lagoon City
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Lagoon City clear sky chart from 2005-11-06 to 2024-11-05.

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% 10% 3 8% 5% 4 5% 4 5% 7% 34%	101953
	Night	16% 11% 4 9% 5% 4 4 3 5% 6% 31%	97082
Transparency	Day	48% 5% 13% 22% 10% 1	105553
	Night	52% 5% 12% 20% 10% 1	101571
Seeing	Day	18% 6% 23% 31% 17% 5%	14762
	Night	20% 7% 27% 31% 13% 2	23706

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% 17% 8% 11% 6% 4 4 3 4 4 24%	2517
	11th to 20th	Day	11% 18% 7% 16% 8% 7% 5% 4 5% 5% 15%	2658
	21st to end	Day	18% 20% 6% 11% 6% 5% 4 3 5% 5% 17%	3124
February	1st to 10th	Day	13% 17% 5% 14% 7% 6% 5% 5% 5% 5% 20%	1710
	11th to 20th	Day	11% 14% 7% 11% 6% 5% 4 4 4 6% 26%	1663
	21st to end	Day	16% 15% 4 11% 6% 6% 4 3 5% 6% 23%	1441
March	1st to 10th	Day	18% 12% 4 9% 5% 4 5% 4 5% 4 31%	3432
	11th to 20th	Day	11% 14% 6% 10% 6% 5% 5% 4 5% 5% 28%	3480
	21st to end	Day	14% 8% 3 7% 5% 4 4 4 5% 6% 41%	3815
April	1st to 10th	Day	18% 11% 3 8% 6% 5% 4 3 5% 5% 31%	2261
	11th to 20th	Day	20% 9% 2 6% 5% 4 4 3 5% 5% 37%	2328
	21st to end	Day	19% 10% 3 7% 5% 4 4 3 4 6% 35%	2470
May	1st to 10th	Day	17% 7% 3 8% 5% 5% 5% 4 6% 7% 34%	4165
	11th to 20th	Day	15% 8% 2 7% 4 5% 4 3 6% 7% 37%	4398
	21st to end	Day	15% 6% 2 5% 4 4 4 4 6% 7% 44%	4837
June	1st to 10th	Day	17% 7% 2 7% 4 4 4 4 5% 8% 37%	2660
	11th to 20th	Day	12% 5% 2 6% 5% 4 4 5% 7% 9% 40%	2722
	21st to end	Day	16% 6% 2 7% 4 5% 4 4 7% 9% 38%	2850
July	1st to 10th	Day	11% 4 2 6% 5% 5% 5% 5% 7% 10% 39%	4642
	11th to 20th	Day	11% 5% 2 5% 4 4 5% 4 6% 8% 46%	4440
	21st to end	Day	8% 4 2 5% 5% 5% 5% 4 7% 9% 45%	4607
August	1st to 10th	Day	15% 6% 3 6% 4 4 5% 4 5% 8% 40%	4104
	11th to 20th	Day	14% 6% 3 6% 4 5% 4 4 7% 10% 37%	4044
	21st to end	Day	9% 5% 2 6% 5% 4 4 4 6% 9% 45%	4354
September	1st to 10th	Day	14% 6% 2 6% 5% 4 4 3 5% 8% 42%	2280
	11th to 20th	Day	12% 6% 2 5% 4 4 4 3 5% 7% 48%	2190
	21st to end	Day	16% 7% 2 8% 5% 5% 4 4 5% 6% 38%	2038
October	1st to 10th	Day	20% 9% 2 7% 5% 5% 4 4 4 7% 34%	1900
	11th to 20th	Day	23% 10% 3 9% 5% 4 5% 4 5% 6% 26%	1900
	21st to end	Day	25% 11% 4 9% 5% 5% 5% 4 5% 5% 23%	2090
November	1st to 10th	Day	17% 12% 4 7% 5% 5% 5% 4 5% 6% 29%	1595
	11th to 20th	Day	17% 13% 4 11% 5% 4 6% 4 7% 7% 22%	1520
	21st to end	Day	20% 19% 4 9% 6% 5% 5% 4 5% 6% 17%	1520
December	1st to 10th	Day	17% 21% 6% 14% 7% 5% 4 3 4 5% 14%	1520
	11th to 20th	Day	19% 17% 4 9% 5% 4 5% 3 5% 6% 22%	1906
	21st to end	Day	26% 18% 5% 12% 5% 4 4 3 4 4 14%	2772
January	1st to 10th	Night	16% 21% 7% 14% 7% 5% 4 3 4 5% 14%	4429
	11th to 20th	Night	14% 13% 8% 17% 10% 6% 4 3 4 5% 16%	4298
	21st to end	Night	19% 17% 7% 11% 6% 5% 4 3 5% 5% 19%	4532
February	1st to 10th	Night	13% 17% 5% 12% 8% 6% 6% 4 5% 6% 19%	2470
	11th to 20th	Night	13% 15% 6% 10% 6% 5% 5% 4 5% 6% 26%	2403
	21st to end	Night	15% 14% 4 11% 6% 5% 4 3 5% 6% 26%	2006
March	1st to 10th	Night	17% 12% 3 8% 5% 4 4 3 5% 6% 32%	3408
	11th to 20th	Night	12% 15% 6% 9% 5% 4 4 3 5% 6% 30%	3479
	21st to end	Night	15% 8% 4 7% 4 4 4 4 6% 7% 37%	3817
April	1st to 10th	Night	20% 12% 3 8% 5% 4 5% 4 5% 5% 30%	1919
	11th to 20th	Night	17% 9% 3 7% 5% 4 3 4 6% 7% 36%	1815
	21st to end	Night	16% 9% 3 10% 5% 4 4 4 5% 6% 34%	1710
May	1st to 10th	Night	17% 7% 3 7% 5% 3 4 3 5% 8% 38%	2774
	11th to 20th	Night	16% 7% 2 6% 4 4 5% 4 6% 7% 39%	2495
	21st to end	Night	11% 6% 2 5% 4 4 4 3 5% 9% 48%	2738
June	1st to 10th	Night	15% 7% 2 6% 6% 4 5% 4 6% 8% 38%	1520
	11th to 20th	Night	10% 5% 2 6% 4 4 4 4 8% 9% 44%	1450
	21st to end	Night	13% 7% 3 7% 6% 4 5% 4 6% 6% 40%	1330
July	1st to 10th	Night	7% 5% 2 6% 5% 4 4 4 6% 8% 49%	2320
	11th to 20th	Night	14% 5% 2 4 3 3 4 3 5% 8% 50%	2520
	21st to end	Night	9% 5% 2 5% 4 4 4 4 7% 8% 49%	2942
August	1st to 10th	Night	11% 5% 2 6% 4 5% 4 4 6% 7% 46%	2825
	11th to 20th	Night	12% 6% 2 5% 3 4 4 3 5% 7% 47%	2785
	21st to end	Night	13% 5% 2 6% 4 4 5% 3 5% 8% 47%	3270
September	1st to 10th	Night	11% 5% 2 6% 4 4 5% 4 6% 8% 45%	1900
	11th to 20th	Night	11% 5% 1 4 4 3 4 3 6% 7% 50%	1985
	21st to end	Night	17% 7% 2 6% 4 4 4 3 5% 6% 41%	2142
October	1st to 10th	Night	18% 7% 3 6% 5% 5% 5% 4 6% 6% 35%	2280
	11th to 20th	Night	21% 10% 4 8% 5% 5% 5% 3 5% 5% 28%	2280
	21st to end	Night	21% 14% 3 8% 6% 4 5% 3 5% 6% 25%	2508
November	1st to 10th	Night	19% 11% 3 6% 4 4 4 3 5% 7% 32%	2580
	11th to 20th	Night	17% 17% 4 8% 6% 5% 4 4 5% 6% 24%	2660
	21st to end	Night	21% 15% 4 10% 6% 5% 5% 4 5% 6% 18%	2660
December	1st to 10th	Night	20% 21% 6% 11% 5% 4 5% 4 4 4 15%	2660
	11th to 20th	Night	17% 20% 5% 12% 7% 5% 4 3 5% 5% 18%	3288
	21st to end	Night	27% 20% 5% 13% 6% 4 4 3 4 4 11%	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	64% 5% 15% 10% 7%	2518
	11th to 20th	Day	71% 5% 10% 9% 5%	2658
	21st to end	Day	69% 6% 10% 9% 6% 1	3124
February	1st to 10th	Day	64% 4 11% 16% 4 1	1710
	11th to 20th	Day	58% 5% 11% 16% 8% 1	1672
	21st to end	Day	62% 4 11% 16% 7%	1441
March	1st to 10th	Day	53% 5% 16% 15% 10%	3435
	11th to 20th	Day	54% 4 13% 20% 8% 1	3480
	21st to end	Day	43% 5% 12% 22% 17% 2	3815
April	1st to 10th	Day	53% 5% 10% 20% 11% 1	2261
	11th to 20th	Day	48% 4 10% 23% 15% 1	2328
	21st to end	Day	51% 5% 10% 19% 13% 3	2470
May	1st to 10th	Day	46% 5% 12% 23% 12% 1	4177
	11th to 20th	Day	44% 6% 15% 24% 11% 1	4402
	21st to end	Day	38% 5% 14% 23% 16% 3	4837
June	1st to 10th	Day	45% 6% 12% 23% 13% 1	2660
	11th to 20th	Day	38% 7% 14% 25% 15% 1	2722
	21st to end	Day	41% 7% 16% 23% 13% 1	2850
July	1st to 10th	Day	38% 5% 17% 25% 14% 1	4571
	11th to 20th	Day	35% 4 16% 35% 10% 1	4365
	21st to end	Day	35% 6% 13% 31% 15% 1	4460
August	1st to 10th	Day	42% 4 15% 26% 11% 1	4091
	11th to 20th	Day	40% 5% 18% 27% 10% 1	4083
	21st to end	Day	35% 4 14% 35% 11% 1	4354
September	1st to 10th	Day	40% 6% 14% 29% 11% 1	2280
	11th to 20th	Day	35% 5% 14% 32% 13%	2190
	21st to end	Day	46% 7% 13% 25% 9%	2038
October	1st to 10th	Day	44% 4 12% 28% 10% 1	3160
	11th to 20th	Day	48% 3 16% 23% 9%	3140
	21st to end	Day	55% 5% 15% 19% 6%	3428
November	1st to 10th	Day	55% 6% 15% 17% 7%	1595
	11th to 20th	Day	59% 8% 12% 14% 6% 1	1520
	21st to end	Day	66% 8% 12% 11% 3	1520
December	1st to 10th	Day	74% 6% 10% 8% 2	1520
	11th to 20th	Day	63% 8% 11% 11% 6%	1906
	21st to end	Day	74% 5% 9% 9% 2	2772
January	1st to 10th	Night	72% 5% 10% 10% 3	4429
	11th to 20th	Night	68% 6% 12% 10% 4 1	4298
	21st to end	Night	67% 5% 13% 10% 5% 1	4532
February	1st to 10th	Night	66% 5% 10% 16% 4 1	2470
	11th to 20th	Night	58% 5% 12% 17% 7%	2405
	21st to end	Night	57% 5% 12% 18% 8%	2006
March	1st to 10th	Night	54% 4 12% 20% 9% 1	3418
	11th to 20th	Night	53% 4 16% 18% 7% 2	3480
	21st to end	Night	44% 6% 10% 23% 16% 1	3817
April	1st to 10th	Night	55% 4 9% 19% 11% 1	1919
	11th to 20th	Night	46% 5% 9% 22% 16% 2	1815
	21st to end	Night	50% 6% 11% 15% 16% 2	1710
May	1st to 10th	Night	44% 5% 14% 18% 17% 2	2781
	11th to 20th	Night	42% 6% 14% 24% 12% 2	2496
	21st to end	Night	34% 5% 14% 26% 19% 2	2739
June	1st to 10th	Night	43% 6% 11% 23% 15% 2	1520
	11th to 20th	Night	35% 6% 14% 25% 20% 1	1450
	21st to end	Night	43% 6% 13% 23% 14% 1	1330
July	1st to 10th	Night	34% 4 16% 26% 18% 2	2282
	11th to 20th	Night	35% 3 13% 34% 15%	2472
	21st to end	Night	33% 5% 13% 33% 16% 1	2848
August	1st to 10th	Night	37% 4 15% 26% 17% 1	2814
	11th to 20th	Night	37% 4 18% 27% 13% 1	2812
	21st to end	Night	37% 5% 11% 34% 12% 1	3270
September	1st to 10th	Night	35% 8% 15% 28% 12% 1	1900
	11th to 20th	Night	33% 5% 14% 32% 16% 1	1985
	21st to end	Night	43% 5% 13% 28% 10%	2142
October	1st to 10th	Night	39% 5% 10% 28% 18%	3800
	11th to 20th	Night	49% 4 15% 24% 9%	3779
	21st to end	Night	50% 5% 14% 23% 7%	4120
November	1st to 10th	Night	52% 6% 13% 21% 8% 1	2580
	11th to 20th	Night	59% 7% 12% 14% 6% 2	2660
	21st to end	Night	65% 9% 14% 10% 2	2660
December	1st to 10th	Night	71% 7% 10% 9% 3	2660
	11th to 20th	Night	68% 6% 12% 12% 3	3288
	21st to end	Night	79% 4 7% 7% 2	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	18% 14% 34% 22% 11% 2	180
	11th to 20th	Day	19% 10% 37% 24% 9% 1	221
	21st to end	Day	26% 5% 28% 31% 8% 1	297
February	1st to 10th	Day	21% 13% 32% 27% 6% 1	270
	11th to 20th	Day	16% 10% 37% 32% 4	270
	21st to end	Day	26% 13% 28% 30% 2	244
March	1st to 10th	Day	18% 5% 34% 35% 7%	460
	11th to 20th	Day	16% 12% 31% 32% 10% 1	460
	21st to end	Day	25% 5% 27% 30% 12% 1	506
April	1st to 10th	Day	20% 5% 29% 34% 9% 2	460
	11th to 20th	Day	26% 5% 26% 27% 12% 4	452
	21st to end	Day	21% 8% 24% 32% 12% 4	460
May	1st to 10th	Day	21% 5% 20% 33% 17% 5%	463
	11th to 20th	Day	16% 3 18% 38% 20% 6%	487
	21st to end	Day	16% 2 19% 33% 23% 8%	529
June	1st to 10th	Day	18% 4 18% 37% 22% 3	490
	11th to 20th	Day	13% 4 22% 34% 21% 7%	552
	21st to end	Day	17% 4 21% 35% 18% 4	680
July	1st to 10th	Day	10% 3 15% 38% 27% 7%	608
	11th to 20th	Day	14% 3 15% 32% 28% 9%	484
	21st to end	Day	8% 2 16% 38% 27% 9%	532
August	1st to 10th	Day	11% 4 14% 32% 30% 9%	486
	11th to 20th	Day	12% 3 14% 26% 32% 12%	479
	21st to end	Day	13% 5% 15% 29% 29% 9%	539
September	1st to 10th	Day	11% 7% 19% 30% 23% 11%	490
	11th to 20th	Day	10% 3 13% 30% 28% 16%	490
	21st to end	Day	17% 6% 21% 29% 20% 8%	490
October	1st to 10th	Day	22% 5% 26% 25% 13% 9%	490
	11th to 20th	Day	22% 13% 27% 27% 8% 2	490
	21st to end	Day	29% 11% 27% 24% 8% 1	539
November	1st to 10th	Day	23% 15% 26% 27% 9% 1	246
	11th to 20th	Day	21% 12% 35% 24% 6% 2	180
	21st to end	Day	25% 14% 30% 29% 2	180
December	1st to 10th	Day	22% 16% 31% 28% 3 1	180
	11th to 20th	Day	25% 21% 29% 20% 3 2	180
	21st to end	Day	27% 13% 35% 21% 5%	198
January	1st to 10th	Night	23% 11% 36% 21% 7% 2	760
	11th to 20th	Night	26% 8% 30% 28% 8% 1	760
	21st to end	Night	21% 7% 27% 36% 9% 1	836
February	1st to 10th	Night	21% 6% 35% 32% 6%	760
	11th to 20th	Night	19% 9% 33% 32% 7% 1	743
	21st to end	Night	21% 7% 34% 32% 6%	628
March	1st to 10th	Night	21% 5% 31% 37% 7%	760
	11th to 20th	Night	18% 6% 35% 33% 7% 1	760
	21st to end	Night	20% 4 27% 36% 13%	836
April	1st to 10th	Night	25% 4 27% 35% 8%	760
	11th to 20th	Night	20% 5% 28% 33% 12% 2	691
	21st to end	Night	20% 5% 26% 35% 14% 1	570
May	1st to 10th	Night	21% 2 17% 40% 17% 2	537
	11th to 20th	Night	15% 6% 20% 39% 19% 2	374
	21st to end	Night	12% 2 18% 41% 24% 2	411
June	1st to 10th	Night	16% 4 22% 39% 17% 2	380
	11th to 20th	Night	10% 4 21% 42% 21% 2	380
	21st to end	Night	16% 5% 16% 39% 23% 2	380
July	1st to 10th	Night	9% 2 16% 44% 26% 3	370
	11th to 20th	Night	11% 4 19% 38% 26% 3	368
	21st to end	Night	11% 2 15% 44% 27% 1	531
August	1st to 10th	Night	11% 2 16% 37% 30% 4	567
	11th to 20th	Night	8% 2 18% 36% 31% 5%	564
	21st to end	Night	13% 3 18% 35% 28% 3	708
September	1st to 10th	Night	12% 4 20% 35% 22% 6%	760
	11th to 20th	Night	14% 2 16% 32% 26% 9%	760
	21st to end	Night	20% 6% 18% 30% 19% 7%	760
October	1st to 10th	Night	20% 6% 29% 26% 16% 3	760
	11th to 20th	Night	24% 10% 29% 25% 10% 2	760
	21st to end	Night	28% 12% 29% 26% 5%	836
November	1st to 10th	Night	24% 11% 27% 27% 11% 1	760
	11th to 20th	Night	24% 13% 34% 21% 7% 1	760
	21st to end	Night	26% 14% 32% 23% 5%	760
December	1st to 10th	Night	30% 14% 32% 19% 4	760
	11th to 20th	Night	23% 14% 36% 21% 5% 1	760
	21st to end	Night	30% 9% 34% 22% 3	836

Page generated at 2024-11-03 02:11:24. Version ac07

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