Finley Point Campground
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Finley Point Campground clear sky chart from 2005-11-06 to 2024-11-28.

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	14% 12% 3 6% 4 4 4 3 5% 7% 38%	105580
	Night	16% 15% 4 7% 4 4 4 3 5% 6% 33%	102612
Transparency	Day	46% 5% 14% 20% 11% 4	105311
	Night	52% 5% 13% 18% 9% 3	102469
Seeing	Day	20% 9% 22% 27% 18% 4	15291
	Night	25% 7% 16% 33% 17% 2	24531

By Month

Percentage Cloud Cover SW (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	19% 31% 10% 9% 4 4 5% 4 4 5% 7%	2251
	11th to 20th	Day	21% 18% 8% 9% 6% 4 4 3 7% 11% 10%	2540
	21st to end	Day	20% 22% 5% 8% 5% 4 4 4 6% 10% 12%	2794
February	1st to 10th	Day	24% 26% 5% 10% 4 4 3 1 3 5% 16%	1603
	11th to 20th	Day	15% 28% 7% 9% 4 4 4 4 5% 5% 16%	1696
	21st to end	Day	15% 25% 8% 10% 4 4 4 3 4 5% 18%	1570
March	1st to 10th	Day	11% 17% 5% 11% 6% 5% 4 3 5% 8% 24%	3138
	11th to 20th	Day	12% 17% 4 6% 4 4 3 2 4 7% 37%	3476
	21st to end	Day	15% 23% 5% 10% 6% 5% 6% 4 5% 6% 17%	3845
April	1st to 10th	Day	16% 19% 4 10% 5% 5% 4 4 5% 8% 22%	2288
	11th to 20th	Day	19% 16% 4 7% 4 5% 5% 3 5% 6% 26%	2437
	21st to end	Day	18% 14% 3 8% 5% 4 5% 4 6% 6% 27%	2470
May	1st to 10th	Day	19% 14% 3 7% 5% 4 4 3 5% 5% 30%	4110
	11th to 20th	Day	10% 11% 3 7% 4 5% 6% 5% 6% 10% 34%	4426
	21st to end	Day	16% 10% 3 7% 6% 5% 5% 5% 7% 8% 27%	5161
June	1st to 10th	Day	23% 8% 3 6% 5% 4 4 4 5% 7% 32%	2850
	11th to 20th	Day	23% 9% 2 5% 5% 4 5% 4 5% 6% 31%	2850
	21st to end	Day	10% 5% 2 5% 4 4 4 4 6% 8% 49%	2850
July	1st to 10th	Day	3 3 1 4 3 3 4 3 6% 6% 65%	4740
	11th to 20th	Day	3 2 1 2 1 2 2 2 3 4 79%	4622
	21st to end	Day	3 2 1 2 2 2 3 2 5% 6% 73%	4790
August	1st to 10th	Day	6% 3 1 4 3 3 3 4 5% 7% 60%	4282
	11th to 20th	Day	5% 3 1 4 3 3 4 3 5% 8% 62%	4028
	21st to end	Day	8% 3 1 4 3 3 4 3 5% 6% 61%	4521
September	1st to 10th	Day	9% 3 1 4 3 3 3 3 5% 7% 59%	2273
	11th to 20th	Day	13% 6% 3 5% 3 4 5% 4 5% 8% 45%	2090
	21st to end	Day	15% 6% 2 4 3 4 4 3 6% 8% 44%	2090
October	1st to 10th	Day	11% 5% 1 4 3 3 3 3 4 7% 56%	3400
	11th to 20th	Day	17% 9% 2 5% 3 3 4 3 4 7% 43%	2998
	21st to end	Day	22% 14% 3 6% 4 3 4 4 5% 6% 30%	3101
November	1st to 10th	Day	28% 19% 4 6% 3 3 3 3 4 7% 19%	1764
	11th to 20th	Day	23% 21% 5% 8% 4 4 4 4 5% 7% 15%	1610
	21st to end	Day	21% 24% 4 7% 4 5% 3 3 5% 8% 16%	1459
December	1st to 10th	Day	22% 22% 6% 8% 4 4 3 3 5% 6% 16%	1330
	11th to 20th	Day	20% 28% 6% 11% 6% 4 4 4 4 7% 7%	1685
	21st to end	Day	16% 22% 7% 9% 4 4 6% 7% 8% 10% 9%	2442
January	1st to 10th	Night	21% 30% 9% 9% 4 5% 5% 3 3 4 7%	4722
	11th to 20th	Night	18% 18% 7% 11% 4 4 4 4 10% 9% 11%	4420
	21st to end	Night	20% 27% 6% 8% 4 3 3 3 4 8% 14%	4862
February	1st to 10th	Night	22% 26% 6% 8% 4 3 3 3 3 4 19%	2575
	11th to 20th	Night	20% 26% 5% 8% 4 4 3 3 3 4 20%	2369
	21st to end	Night	14% 28% 8% 9% 5% 4 3 3 3 5% 20%	1884
March	1st to 10th	Night	12% 17% 6% 10% 4 4 4 3 5% 7% 28%	3736
	11th to 20th	Night	12% 17% 3 6% 4 3 3 2 4 4 41%	3504
	21st to end	Night	17% 26% 5% 10% 6% 4 4 3 5% 5% 14%	3804
April	1st to 10th	Night	16% 22% 4 6% 4 3 3 3 5% 7% 27%	1891
	11th to 20th	Night	21% 16% 4 8% 4 5% 5% 3 4 4 27%	1691
	21st to end	Night	18% 13% 3 7% 5% 5% 5% 3 5% 5% 32%	1710
May	1st to 10th	Night	25% 14% 3 6% 4 4 3 3 5% 4 30%	2860
	11th to 20th	Night	13% 7% 3 6% 4 5% 5% 4 6% 8% 38%	2466
	21st to end	Night	24% 11% 3 9% 5% 6% 5% 4 6% 6% 22%	2414
June	1st to 10th	Night	22% 7% 2 6% 4 5% 4 3 5% 6% 35%	1330
	11th to 20th	Night	26% 7% 2 6% 4 4 3 4 6% 6% 33%	1330
	21st to end	Night	11% 5% 2 3 3 3 4 5% 5% 8% 53%	1330
July	1st to 10th	Night	4 3 1 3 2 3 3 2 4 5% 70%	2220
	11th to 20th	Night	4 2 1 2 2 2 2 2 3 3 78%	2334
	21st to end	Night	4 1 1 2 2 2 2 3 4 5% 74%	2761
August	1st to 10th	Night	5% 4 1 3 2 2 3 3 6% 6% 66%	2651
	11th to 20th	Night	5% 2 1 4 4 4 5% 4 7% 8% 57%	2811
	21st to end	Night	6% 4 1 3 2 3 3 3 4 6% 64%	3146
September	1st to 10th	Night	9% 4 1 3 3 3 4 3 6% 8% 57%	1905
	11th to 20th	Night	13% 5% 2 5% 3 3 4 3 5% 7% 48%	2090
	21st to end	Night	15% 5% 2 5% 3 3 3 3 5% 7% 48%	2090
October	1st to 10th	Night	15% 6% 2 5% 3 3 3 3 4 6% 50%	3576
	11th to 20th	Night	13% 8% 2 4 3 3 4 3 6% 7% 46%	3926
	21st to end	Night	18% 15% 2 5% 3 3 4 3 4 7% 36%	4457
November	1st to 10th	Night	28% 19% 3 5% 3 4 4 3 4 6% 21%	2535
	11th to 20th	Night	24% 21% 4 7% 4 3 3 3 4 8% 19%	2769
	21st to end	Night	21% 20% 4 7% 5% 4 3 3 4 8% 21%	2873
December	1st to 10th	Night	19% 25% 4 7% 5% 4 3 3 5% 8% 18%	2850
	11th to 20th	Night	19% 24% 7% 9% 5% 4 4 3 5% 8% 12%	3506
	21st to end	Night	16% 22% 6% 10% 5% 5% 8% 4 5% 9% 10%	5214

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% 7% 9% 5% 1	2251
	11th to 20th	Day	69% 5% 12% 11% 2 1	2540
	21st to end	Day	69% 9% 13% 7% 2	2794
February	1st to 10th	Day	75% 4 11% 6% 4	1603
	11th to 20th	Day	70% 7% 13% 8% 3	1705
	21st to end	Day	70% 5% 10% 11% 4 1	1570
March	1st to 10th	Day	58% 3 14% 17% 8%	3138
	11th to 20th	Day	48% 4 24% 22% 1	3476
	21st to end	Day	67% 7% 15% 8% 3	3845
April	1st to 10th	Day	61% 6% 16% 16% 2	2288
	11th to 20th	Day	59% 4 12% 19% 5%	2440
	21st to end	Day	56% 5% 15% 18% 5% 1	2470
May	1st to 10th	Day	56% 3 16% 19% 5% 1	4110
	11th to 20th	Day	42% 7% 21% 21% 9%	4429
	21st to end	Day	50% 7% 22% 17% 4	5162
June	1st to 10th	Day	51% 6% 17% 19% 6%	2850
	11th to 20th	Day	51% 5% 14% 18% 9% 2	2850
	21st to end	Day	33% 5% 18% 28% 15% 1	2850
July	1st to 10th	Day	20% 3 7% 25% 29% 17%	4666
	11th to 20th	Day	11% 2 6% 15% 24% 42%	4541
	21st to end	Day	14% 2 5% 21% 39% 19%	4639
August	1st to 10th	Day	24% 2 8% 30% 27% 9%	4266
	11th to 20th	Day	23% 3 12% 39% 20% 3	4067
	21st to end	Day	25% 3 9% 38% 22% 3	4520
September	1st to 10th	Day	26% 3 14% 31% 18% 8%	2273
	11th to 20th	Day	38% 5% 14% 27% 14% 2	2090
	21st to end	Day	38% 5% 19% 25% 10% 2	2090
October	1st to 10th	Day	30% 3 15% 37% 15%	3400
	11th to 20th	Day	43% 3 20% 26% 9%	2998
	21st to end	Day	56% 3 14% 21% 5%	3101
November	1st to 10th	Day	66% 5% 15% 11% 3	1764
	11th to 20th	Day	68% 5% 15% 10% 3	1610
	21st to end	Day	66% 6% 15% 10% 3	1459
December	1st to 10th	Day	69% 7% 15% 7% 2	1330
	11th to 20th	Day	78% 7% 11% 3 1	1684
	21st to end	Day	66% 13% 9% 11% 1	2442
January	1st to 10th	Night	80% 9% 7% 4	4722
	11th to 20th	Night	67% 7% 13% 9% 4 1	4420
	21st to end	Night	72% 9% 10% 7% 2	4862
February	1st to 10th	Night	71% 5% 11% 9% 3 1	2575
	11th to 20th	Night	69% 4 13% 11% 2	2370
	21st to end	Night	69% 4 9% 14% 4 1	1884
March	1st to 10th	Night	54% 5% 13% 19% 9%	3736
	11th to 20th	Night	48% 5% 20% 26% 2	3504
	21st to end	Night	71% 7% 11% 9% 2	3804
April	1st to 10th	Night	58% 6% 15% 18% 3	1891
	11th to 20th	Night	60% 5% 10% 17% 7% 1	1691
	21st to end	Night	53% 4 16% 20% 6% 1	1710
May	1st to 10th	Night	57% 4 12% 20% 7%	2860
	11th to 20th	Night	41% 5% 16% 24% 14%	2466
	21st to end	Night	60% 6% 14% 15% 4	2414
June	1st to 10th	Night	49% 6% 16% 21% 8%	1330
	11th to 20th	Night	51% 5% 13% 21% 8% 2	1330
	21st to end	Night	29% 5% 15% 31% 18% 2	1330
July	1st to 10th	Night	18% 2 7% 28% 27% 18%	2185
	11th to 20th	Night	14% 2 5% 16% 18% 44%	2292
	21st to end	Night	15% 2 6% 19% 29% 29%	2674
August	1st to 10th	Night	20% 2 7% 33% 26% 12%	2643
	11th to 20th	Night	26% 3 12% 32% 21% 5%	2838
	21st to end	Night	22% 3 7% 41% 22% 5%	3146
September	1st to 10th	Night	25% 4 12% 28% 21% 10%	1905
	11th to 20th	Night	35% 4 12% 29% 18% 3	2090
	21st to end	Night	35% 4 20% 24% 15% 3	2090
October	1st to 10th	Night	37% 3 11% 30% 18% 1	3576
	11th to 20th	Night	38% 3 20% 25% 13%	3926
	21st to end	Night	49% 4 13% 25% 8% 1	4457
November	1st to 10th	Night	64% 6% 15% 11% 4	2535
	11th to 20th	Night	65% 7% 16% 10% 3	2769
	21st to end	Night	62% 6% 18% 11% 3	2873
December	1st to 10th	Night	67% 7% 13% 11% 3	2850
	11th to 20th	Night	71% 6% 14% 7% 1	3507
	21st to end	Night	67% 12% 12% 7% 1	5214

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	31% 11% 16% 20% 15% 7%	180
	11th to 20th	Day	31% 11% 19% 23% 10% 6%	180
	21st to end	Day	27% 11% 20% 27% 13% 2	198
February	1st to 10th	Day	34% 13% 26% 20% 5% 1	220
	11th to 20th	Day	25% 14% 23% 25% 12% 2	301
	21st to end	Day	26% 15% 21% 24% 11% 2	382
March	1st to 10th	Day	27% 11% 22% 26% 12% 2	460
	11th to 20th	Day	23% 11% 21% 20% 22% 3	460
	21st to end	Day	25% 12% 25% 26% 10% 1	506
April	1st to 10th	Day	22% 15% 28% 22% 11% 2	460
	11th to 20th	Day	27% 14% 25% 20% 12% 2	452
	21st to end	Day	20% 13% 26% 24% 12% 4	460
May	1st to 10th	Day	19% 10% 22% 27% 19% 3	463
	11th to 20th	Day	21% 7% 18% 28% 20% 6%	557
	21st to end	Day	23% 7% 16% 25% 22% 6%	734
June	1st to 10th	Day	22% 8% 17% 27% 19% 7%	680
	11th to 20th	Day	26% 10% 24% 24% 14% 2	680
	21st to end	Day	12% 6% 21% 28% 27% 5%	680
July	1st to 10th	Day	4 4 20% 35% 32% 5%	671
	11th to 20th	Day	6% 7% 21% 37% 25% 4	602
	21st to end	Day	3 4 25% 35% 25% 8%	531
August	1st to 10th	Day	7% 6% 19% 36% 24% 8%	487
	11th to 20th	Day	8% 3 21% 33% 26% 9%	477
	21st to end	Day	9% 8% 21% 31% 23% 7%	539
September	1st to 10th	Day	11% 6% 25% 27% 26% 6%	490
	11th to 20th	Day	15% 9% 23% 26% 19% 8%	490
	21st to end	Day	21% 6% 21% 25% 22% 4	490
October	1st to 10th	Day	19% 7% 24% 28% 16% 5%	439
	11th to 20th	Day	27% 4 20% 25% 17% 7%	300
	21st to end	Day	32% 8% 26% 21% 10% 3	330
November	1st to 10th	Day	40% 10% 19% 22% 9%	300
	11th to 20th	Day	35% 8% 21% 23% 11% 1	300
	21st to end	Day	34% 8% 21% 21% 15% 1	234
December	1st to 10th	Day	39% 7% 17% 16% 17% 3	180
	11th to 20th	Day	36% 11% 17% 27% 8% 1	180
	21st to end	Day	27% 9% 27% 26% 9% 2	198
January	1st to 10th	Night	36% 10% 16% 25% 11% 2	946
	11th to 20th	Night	31% 10% 16% 28% 13% 2	760
	21st to end	Night	31% 8% 16% 32% 10% 2	836
February	1st to 10th	Night	33% 8% 18% 29% 10% 1	760
	11th to 20th	Night	33% 10% 19% 26% 9% 1	744
	21st to end	Night	25% 13% 21% 29% 12% 1	628
March	1st to 10th	Night	29% 8% 19% 32% 11% 1	760
	11th to 20th	Night	25% 9% 18% 32% 15% 1	760
	21st to end	Night	29% 7% 19% 33% 12% 2	836
April	1st to 10th	Night	27% 8% 19% 32% 13% 1	751
	11th to 20th	Night	27% 7% 21% 33% 12%	563
	21st to end	Night	23% 8% 19% 32% 17% 1	570
May	1st to 10th	Night	22% 6% 15% 36% 19% 2	570
	11th to 20th	Night	14% 4 14% 38% 26% 4	420
	21st to end	Night	26% 4 11% 30% 28% 2	411
June	1st to 10th	Night	24% 4 14% 34% 19% 4	380
	11th to 20th	Night	29% 3 16% 33% 17% 2	380
	21st to end	Night	13% 3 11% 39% 31% 4	380
July	1st to 10th	Night	6% 1 11% 45% 37% 1	370
	11th to 20th	Night	6% 1 11% 54% 28% 1	368
	21st to end	Night	5% 1 11% 48% 33% 2	416
August	1st to 10th	Night	5% 4 10% 41% 38% 2	448
	11th to 20th	Night	5% 2 10% 43% 36% 5%	564
	21st to end	Night	9% 4 12% 42% 32% 2	627
September	1st to 10th	Night	11% 2 11% 44% 29% 4	727
	11th to 20th	Night	15% 3 9% 36% 31% 6%	760
	21st to end	Night	18% 4 14% 37% 24% 4	760
October	1st to 10th	Night	22% 4 16% 38% 18% 2	760
	11th to 20th	Night	23% 5% 12% 36% 19% 4	760
	21st to end	Night	31% 6% 22% 26% 14% 2	836
November	1st to 10th	Night	37% 7% 16% 31% 9%	780
	11th to 20th	Night	37% 9% 18% 26% 10%	969
	21st to end	Night	30% 7% 17% 31% 14% 1	986
December	1st to 10th	Night	31% 9% 16% 29% 15% 2	950
	11th to 20th	Night	34% 8% 19% 30% 9%	950
	21st to end	Night	34% 9% 18% 28% 9%	1045

Page generated at 2024-11-24 22:22:21. Version ac07

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