Little River
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little River clear sky chart from 2005-11-06 to 2026-02-16.

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	11% 6% 2 6% 4 4 5% 4 6% 8% 42%	130932
	Night	11% 6% 2 6% 4 4 4 4 6% 8% 44%	129928
Transparency	Day	37% 7% 15% 19% 16% 5%	134534
	Night	37% 6% 13% 19% 18% 7%	134396
Seeing	Day	14% 10% 25% 26% 17% 7%	17413
	Night	14% 8% 23% 32% 19% 3	27580

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	11% 4 2 5% 3 4 4 3 5% 7% 53%	5258
	11th to 20th	Day	12% 5% 2 5% 3 3 3 3 4 6% 54%	5280
	21st to end	Day	15% 8% 3 7% 4 4 4 3 4 6% 40%	5780
February	1st to 10th	Day	15% 7% 2 7% 4 4 5% 4 6% 5% 42%	1890
	11th to 20th	Day	19% 7% 2 5% 4 3 3 3 5% 5% 45%	1880
	21st to end	Day	14% 6% 2 6% 5% 3 4 4 5% 7% 43%	1815
March	1st to 10th	Day	20% 8% 3 8% 4 3 3 3 4 5% 39%	4935
	11th to 20th	Day	9% 4 1 4 4 4 4 4 6% 7% 54%	4980
	21st to end	Day	12% 5% 3 6% 4 4 4 3 4 5% 50%	5465
April	1st to 10th	Day	9% 4 2 4 3 3 5% 4 6% 7% 52%	2320
	11th to 20th	Day	9% 4 2 4 4 3 4 3 5% 7% 54%	2374
	21st to end	Day	7% 3 2 4 4 4 5% 4 5% 8% 53%	2400
May	1st to 10th	Day	7% 6% 2 7% 5% 5% 5% 5% 8% 11% 40%	5542
	11th to 20th	Day	15% 7% 3 8% 5% 5% 5% 4 7% 9% 33%	5861
	21st to end	Day	9% 5% 2 6% 4 4 5% 5% 8% 9% 43%	6433
June	1st to 10th	Day	9% 7% 3 7% 5% 6% 6% 5% 8% 11% 35%	2600
	11th to 20th	Day	8% 5% 2 5% 4 5% 5% 6% 8% 12% 41%	2600
	21st to end	Day	7% 5% 2 6% 5% 5% 5% 6% 9% 13% 36%	2600
July	1st to 10th	Day	9% 7% 3 9% 6% 6% 6% 5% 9% 11% 30%	5900
	11th to 20th	Day	5% 4 3 8% 6% 6% 7% 6% 9% 14% 31%	5900
	21st to end	Day	7% 6% 3 8% 6% 6% 8% 6% 8% 12% 30%	6424
August	1st to 10th	Day	21% 9% 4 9% 5% 4 5% 5% 7% 10% 21%	4234
	11th to 20th	Day	8% 6% 2 7% 5% 5% 6% 5% 8% 12% 35%	3924
	21st to end	Day	7% 6% 3 7% 5% 5% 5% 4 7% 11% 41%	4312
September	1st to 10th	Day	9% 5% 2 6% 6% 5% 6% 5% 7% 9% 41%	2400
	11th to 20th	Day	14% 6% 2 7% 4 4 6% 4 6% 9% 37%	2272
	21st to end	Day	14% 8% 4 7% 5% 4 4 3 5% 7% 39%	2148
October	1st to 10th	Day	12% 6% 2 7% 5% 4 4 4 5% 7% 45%	2000
	11th to 20th	Day	9% 4 2 5% 3 3 3 3 5% 6% 57%	2000
	21st to end	Day	10% 5% 2 5% 3 3 3 3 4 5% 58%	2200
November	1st to 10th	Day	12% 5% 2 4 3 3 3 3 5% 5% 55%	2057
	11th to 20th	Day	11% 5% 2 6% 4 3 4 2 4 5% 53%	2100
	21st to end	Day	11% 5% 2 6% 4 4 4 3 5% 7% 51%	2000
December	1st to 10th	Day	9% 5% 2 6% 4 5% 4 4 5% 6% 51%	3020
	11th to 20th	Day	14% 6% 2 8% 4 3 4 3 4 5% 46%	3463
	21st to end	Day	14% 7% 2 6% 4 3 4 3 5% 7% 45%	4565
January	1st to 10th	Night	10% 5% 2 6% 4 4 4 3 4 6% 53%	7635
	11th to 20th	Night	11% 5% 2 4 3 4 4 4 5% 7% 50%	7680
	21st to end	Night	15% 8% 3 7% 4 4 4 3 4 5% 44%	8401
February	1st to 10th	Night	16% 6% 2 5% 4 4 3 3 5% 6% 44%	2730
	11th to 20th	Night	18% 7% 3 6% 3 3 3 3 5% 5% 42%	2509
	21st to end	Night	15% 6% 3 6% 4 3 5% 3 5% 7% 43%	1815
March	1st to 10th	Night	16% 10% 4 7% 5% 4 3 2 4 5% 39%	4918
	11th to 20th	Night	12% 4 2 5% 3 3 4 3 6% 8% 50%	4980
	21st to end	Night	12% 4 2 5% 3 3 4 3 4 6% 52%	5467
April	1st to 10th	Night	10% 6% 3 5% 4 5% 4 4 6% 8% 47%	2078
	11th to 20th	Night	9% 5% 2 6% 4 4 5% 3 5% 8% 50%	1975
	21st to end	Night	6% 5% 1 5% 4 4 4 4 6% 9% 53%	2000
May	1st to 10th	Night	7% 6% 2 7% 5% 4 4 4 7% 11% 43%	4382
	11th to 20th	Night	14% 7% 3 7% 4 4 5% 4 7% 10% 36%	4032
	21st to end	Night	11% 5% 2 6% 4 4 5% 4 7% 9% 43%	4421
June	1st to 10th	Night	10% 7% 3 7% 5% 5% 4 5% 9% 10% 35%	1800
	11th to 20th	Night	8% 5% 2 5% 5% 5% 5% 5% 8% 10% 42%	1800
	21st to end	Night	6% 6% 2 6% 5% 6% 7% 6% 8% 13% 37%	1800
July	1st to 10th	Night	8% 6% 3 7% 6% 6% 7% 6% 9% 12% 31%	4058
	11th to 20th	Night	7% 6% 2 8% 5% 5% 6% 7% 9% 15% 29%	4057
	21st to end	Night	7% 6% 3 8% 6% 6% 7% 6% 9% 13% 30%	4427
August	1st to 10th	Night	19% 10% 3 7% 4 4 5% 4 8% 11% 24%	2915
	11th to 20th	Night	6% 5% 2 7% 6% 5% 7% 5% 8% 12% 37%	3089
	21st to end	Night	6% 4 2 7% 4 4 5% 5% 8% 10% 45%	3586
September	1st to 10th	Night	9% 5% 2 6% 4 4 5% 5% 8% 10% 41%	2000
	11th to 20th	Night	12% 6% 3 6% 5% 5% 5% 5% 6% 8% 38%	2122
	21st to end	Night	15% 8% 3 7% 4 4 3 3 5% 6% 40%	2250
October	1st to 10th	Night	11% 7% 2 6% 4 4 4 3 5% 6% 47%	2400
	11th to 20th	Night	10% 4 2 5% 3 4 3 3 5% 7% 56%	2400
	21st to end	Night	9% 5% 2 5% 4 3 3 3 4 6% 55%	2640
November	1st to 10th	Night	11% 5% 2 5% 4 3 3 3 4 6% 55%	2461
	11th to 20th	Night	11% 6% 2 6% 4 4 3 3 4 6% 50%	2520
	21st to end	Night	9% 6% 2 5% 4 4 4 4 6% 8% 49%	2615
December	1st to 10th	Night	12% 5% 2 6% 3 4 3 3 4 6% 53%	4380
	11th to 20th	Night	15% 7% 3 8% 4 3 3 3 4 5% 43%	4952
	21st to end	Night	14% 6% 2 6% 4 4 4 4 5% 7% 45%	6633

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	32% 3 12% 20% 28% 5%	5259
	11th to 20th	Day	34% 2 5% 16% 32% 11%	5280
	21st to end	Day	45% 4 6% 18% 17% 9%	5780
February	1st to 10th	Day	43% 5% 9% 20% 19% 4	1890
	11th to 20th	Day	42% 4 7% 18% 21% 7%	1889
	21st to end	Day	38% 6% 10% 18% 18% 9%	1815
March	1st to 10th	Day	47% 4 8% 13% 20% 8%	4935
	11th to 20th	Day	28% 5% 9% 15% 28% 14%	4980
	21st to end	Day	36% 4 11% 22% 18% 9%	5465
April	1st to 10th	Day	30% 6% 14% 20% 24% 6%	2320
	11th to 20th	Day	28% 5% 13% 25% 19% 10%	2374
	21st to end	Day	26% 8% 16% 24% 22% 4	2400
May	1st to 10th	Day	36% 8% 22% 25% 8% 1	5574
	11th to 20th	Day	45% 8% 17% 20% 10%	5865
	21st to end	Day	32% 9% 18% 22% 16% 2	6447
June	1st to 10th	Day	40% 10% 17% 23% 9%	2600
	11th to 20th	Day	31% 13% 22% 23% 11% 1	2600
	21st to end	Day	34% 13% 23% 23% 7% 1	2600
July	1st to 10th	Day	44% 9% 29% 15% 3 1	5835
	11th to 20th	Day	38% 12% 38% 9% 2	5831
	21st to end	Day	42% 10% 23% 20% 6%	6240
August	1st to 10th	Day	54% 11% 21% 12% 2	4221
	11th to 20th	Day	38% 9% 22% 22% 9%	3962
	21st to end	Day	36% 8% 17% 34% 5%	4312
September	1st to 10th	Day	35% 12% 17% 18% 14% 3	2400
	11th to 20th	Day	41% 10% 14% 18% 14% 4	2272
	21st to end	Day	43% 7% 15% 19% 14% 3	2148
October	1st to 10th	Day	40% 4 8% 20% 23% 4	3260
	11th to 20th	Day	19% 4 5% 17% 30% 25%	3240
	21st to end	Day	28% 3 6% 22% 31% 10%	3538
November	1st to 10th	Day	31% 4 10% 18% 27% 10%	2057
	11th to 20th	Day	35% 4 9% 17% 25% 10%	2100
	21st to end	Day	34% 5% 10% 20% 25% 8%	2000
December	1st to 10th	Day	34% 5% 8% 16% 24% 13%	3020
	11th to 20th	Day	42% 3 9% 21% 20% 5%	3460
	21st to end	Day	40% 4 12% 22% 19% 3	4565
January	1st to 10th	Night	34% 3 9% 21% 27% 6%	7636
	11th to 20th	Night	34% 4 6% 16% 31% 9%	7680
	21st to end	Night	44% 3 5% 14% 24% 9%	8401
February	1st to 10th	Night	41% 3 9% 20% 19% 7%	2730
	11th to 20th	Night	44% 5% 9% 15% 20% 8%	2511
	21st to end	Night	41% 5% 9% 17% 17% 10%	1815
March	1st to 10th	Night	48% 5% 7% 12% 22% 6%	4918
	11th to 20th	Night	32% 5% 9% 13% 24% 17%	4980
	21st to end	Night	34% 4 10% 23% 20% 9%	5467
April	1st to 10th	Night	35% 6% 12% 17% 21% 9%	2078
	11th to 20th	Night	32% 6% 11% 22% 19% 10%	1975
	21st to end	Night	27% 7% 15% 27% 20% 4	2000
May	1st to 10th	Night	34% 8% 20% 27% 10% 2	4412
	11th to 20th	Night	42% 7% 20% 19% 11%	4033
	21st to end	Night	36% 8% 16% 22% 17% 1	4429
June	1st to 10th	Night	40% 11% 17% 23% 9% 1	1800
	11th to 20th	Night	34% 11% 21% 25% 9% 1	1800
	21st to end	Night	34% 14% 22% 23% 6% 1	1800
July	1st to 10th	Night	44% 8% 28% 16% 4	4015
	11th to 20th	Night	40% 12% 37% 9% 2	4006
	21st to end	Night	42% 11% 20% 23% 3	4297
August	1st to 10th	Night	51% 11% 23% 13% 2	2904
	11th to 20th	Night	37% 9% 23% 25% 6%	3117
	21st to end	Night	33% 8% 18% 34% 7%	3586
September	1st to 10th	Night	37% 11% 18% 18% 13% 3	2000
	11th to 20th	Night	42% 10% 14% 18% 14% 2	2122
	21st to end	Night	44% 6% 13% 21% 13% 3	2250
October	1st to 10th	Night	39% 4 9% 19% 24% 5%	3920
	11th to 20th	Night	20% 3 6% 14% 24% 33%	3899
	21st to end	Night	26% 3 6% 25% 28% 12%	4252
November	1st to 10th	Night	32% 4 9% 18% 25% 11%	2461
	11th to 20th	Night	36% 4 9% 16% 25% 10%	2520
	21st to end	Night	32% 5% 11% 22% 22% 7%	2615
December	1st to 10th	Night	34% 4 7% 14% 27% 13%	4380
	11th to 20th	Night	43% 3 11% 17% 19% 7%	4954
	21st to end	Night	39% 4 10% 23% 21% 3	6633

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	17% 20% 43% 15% 4 1	330
	11th to 20th	Day	15% 20% 37% 23% 4 1	330
	21st to end	Day	21% 23% 37% 15% 2 1	363
February	1st to 10th	Day	18% 19% 38% 22% 2	330
	11th to 20th	Day	28% 20% 34% 15% 3	387
	21st to end	Day	17% 19% 38% 19% 6% 1	414
March	1st to 10th	Day	17% 17% 35% 24% 7%	500
	11th to 20th	Day	18% 20% 38% 18% 6% 1	500
	21st to end	Day	15% 17% 39% 21% 7% 2	550
April	1st to 10th	Day	15% 20% 32% 22% 8% 2	500
	11th to 20th	Day	11% 17% 30% 22% 14% 6%	492
	21st to end	Day	9% 13% 28% 30% 14% 6%	500
May	1st to 10th	Day	8% 15% 36% 23% 14% 5%	503
	11th to 20th	Day	16% 6% 26% 29% 18% 6%	527
	21st to end	Day	15% 6% 17% 31% 20% 11%	573
June	1st to 10th	Day	10% 4 22% 34% 21% 9%	530
	11th to 20th	Day	10% 5% 19% 28% 24% 14%	530
	21st to end	Day	8% 4 17% 33% 27% 11%	530
July	1st to 10th	Day	10% 2 8% 32% 34% 14%	525
	11th to 20th	Day	9% 3 8% 31% 34% 16%	524
	21st to end	Day	7% 3 13% 34% 30% 13%	576
August	1st to 10th	Day	18% 4 12% 26% 26% 14%	526
	11th to 20th	Day	11% 3 9% 29% 28% 21%	519
	21st to end	Day	12% 4 12% 27% 28% 17%	583
September	1st to 10th	Day	8% 3 15% 31% 28% 15%	530
	11th to 20th	Day	18% 5% 17% 27% 22% 11%	530
	21st to end	Day	19% 4 16% 30% 21% 9%	530
October	1st to 10th	Day	17% 6% 22% 29% 17% 10%	530
	11th to 20th	Day	12% 8% 23% 32% 18% 6%	530
	21st to end	Day	12% 7% 28% 30% 19% 4	583
November	1st to 10th	Day	14% 9% 30% 27% 16% 4	535
	11th to 20th	Day	14% 11% 36% 26% 11% 1	540
	21st to end	Day	13% 13% 31% 27% 13% 3	440
December	1st to 10th	Day	21% 12% 39% 18% 8% 1	330
	11th to 20th	Day	20% 15% 35% 21% 9% 1	330
	21st to end	Day	20% 12% 39% 19% 9% 2	363
January	1st to 10th	Night	16% 15% 33% 29% 7%	840
	11th to 20th	Night	15% 15% 30% 31% 9%	840
	21st to end	Night	18% 13% 37% 28% 4	924
February	1st to 10th	Night	19% 11% 34% 31% 5%	840
	11th to 20th	Night	22% 14% 36% 24% 3	804
	21st to end	Night	18% 15% 30% 31% 5%	660
March	1st to 10th	Night	15% 12% 38% 28% 7%	800
	11th to 20th	Night	16% 12% 34% 30% 6% 1	800
	21st to end	Night	14% 11% 38% 29% 9%	880
April	1st to 10th	Night	14% 13% 34% 29% 10% 1	800
	11th to 20th	Night	12% 12% 29% 29% 18% 1	791
	21st to end	Night	8% 7% 33% 36% 15% 1	800
May	1st to 10th	Night	8% 9% 31% 35% 15% 1	757
	11th to 20th	Night	13% 7% 20% 39% 19% 3	591
	21st to end	Night	10% 3 13% 35% 32% 7%	650
June	1st to 10th	Night	13% 3 13% 39% 28% 4	600
	11th to 20th	Night	9% 3 13% 37% 29% 10%	600
	21st to end	Night	8% 3 10% 41% 32% 6%	600
July	1st to 10th	Night	10% 3 6% 34% 42% 5%	585
	11th to 20th	Night	9% 1 4 34% 44% 8%	582
	21st to end	Night	8% 3 7% 38% 38% 6%	657
August	1st to 10th	Night	13% 3 6% 34% 36% 9%	597
	11th to 20th	Night	9% 2 8% 33% 40% 8%	718
	21st to end	Night	12% 2 8% 31% 36% 11%	880
September	1st to 10th	Night	11% 2 12% 32% 38% 7%	800
	11th to 20th	Night	15% 3 11% 36% 29% 7%	800
	21st to end	Night	19% 3 12% 33% 26% 6%	800
October	1st to 10th	Night	13% 5% 19% 33% 24% 5%	800
	11th to 20th	Night	11% 6% 22% 36% 22% 4	800
	21st to end	Night	12% 8% 20% 35% 21% 4	880
November	1st to 10th	Night	12% 6% 25% 37% 16% 3	820
	11th to 20th	Night	14% 13% 28% 31% 13% 2	840
	21st to end	Night	14% 8% 29% 32% 14% 3	840
December	1st to 10th	Night	20% 10% 28% 31% 9% 1	840
	11th to 20th	Night	18% 10% 28% 32% 12% 1	840
	21st to end	Night	17% 11% 32% 30% 10% 1	924

Page generated at 2026-02-13 01:42:16. Version ac07

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