Higgins Lake
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Higgins Lake clear sky chart from 2005-11-06 to 2025-03-12.

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% 11% 5% 10% 6% 5% 5% 4 5% 6% 30%	108139
	Night	13% 13% 5% 11% 6% 5% 4 3 5% 6% 29%	111010
Transparency	Day	52% 6% 11% 19% 11% 1	111696
	Night	54% 6% 11% 18% 9% 1	115594
Seeing	Day	20% 16% 30% 21% 9% 4	15992
	Night	20% 12% 31% 26% 9% 1	25901

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	10% 18% 9% 23% 7% 5% 4 3 4 4 13%	3617
	11th to 20th	Day	12% 15% 7% 22% 12% 10% 7% 2 3 3 6%	3620
	21st to end	Day	14% 17% 11% 15% 6% 4 6% 3 4 5% 15%	3982
February	1st to 10th	Day	11% 18% 6% 14% 13% 6% 4 4 4 4 17%	1767
	11th to 20th	Day	12% 15% 7% 16% 11% 6% 4 4 4 4 18%	1918
	21st to end	Day	11% 20% 7% 15% 8% 4 4 3 4 5% 21%	1650
March	1st to 10th	Day	13% 14% 5% 8% 6% 5% 5% 4 4 5% 30%	3220
	11th to 20th	Day	11% 11% 8% 15% 5% 4 4 4 6% 5% 27%	3448
	21st to end	Day	18% 13% 7% 11% 6% 5% 5% 3 4 4 24%	3891
April	1st to 10th	Day	17% 17% 4 8% 6% 5% 3 3 4 5% 28%	2280
	11th to 20th	Day	20% 14% 3 6% 3 3 4 3 5% 5% 34%	2375
	21st to end	Day	16% 12% 4 9% 5% 4 4 4 5% 6% 32%	2470
May	1st to 10th	Day	15% 9% 3 8% 6% 4 5% 4 5% 7% 35%	4082
	11th to 20th	Day	13% 7% 2 6% 5% 4 4 3 5% 7% 43%	4113
	21st to end	Day	12% 6% 3 5% 4 4 4 4 5% 8% 44%	4824
June	1st to 10th	Day	13% 6% 3 6% 5% 4 5% 3 7% 8% 39%	2783
	11th to 20th	Day	13% 6% 2 6% 5% 4 5% 4 7% 8% 40%	2850
	21st to end	Day	14% 6% 2 7% 5% 5% 5% 5% 6% 8% 37%	2768
July	1st to 10th	Day	15% 7% 3 8% 5% 5% 5% 4 6% 8% 35%	4440
	11th to 20th	Day	8% 5% 2 6% 4 5% 5% 4 7% 10% 44%	4440
	21st to end	Day	8% 6% 2 6% 5% 5% 5% 5% 7% 9% 42%	4813
August	1st to 10th	Day	10% 5% 2 7% 5% 6% 6% 6% 8% 9% 36%	4150
	11th to 20th	Day	13% 6% 2 6% 4 4 5% 4 6% 7% 43%	4044
	21st to end	Day	13% 6% 2 8% 4 4 5% 4 5% 7% 41%	4404
September	1st to 10th	Day	13% 7% 2 5% 4 5% 5% 4 7% 8% 40%	2224
	11th to 20th	Day	13% 6% 2 5% 4 5% 4 4 5% 8% 46%	2090
	21st to end	Day	15% 7% 3 7% 4 5% 5% 4 6% 8% 35%	2090
October	1st to 10th	Day	18% 8% 3 7% 4 4 4 4 5% 6% 37%	2081
	11th to 20th	Day	21% 16% 4 10% 6% 4 4 3 5% 6% 22%	1829
	21st to end	Day	22% 16% 4 10% 6% 5% 4 3 5% 6% 18%	1881
November	1st to 10th	Day	16% 15% 4 7% 5% 4 4 4 5% 7% 28%	1762
	11th to 20th	Day	16% 18% 6% 11% 5% 5% 4 5% 4 6% 20%	1800
	21st to end	Day	19% 21% 7% 12% 6% 4 4 2 4 5% 17%	1680
December	1st to 10th	Day	13% 27% 10% 17% 6% 5% 4 3 3 3 9%	2312
	11th to 20th	Day	16% 22% 11% 14% 7% 4 4 3 3 3 13%	2625
	21st to end	Day	23% 25% 9% 13% 6% 4 3 2 2 3 9%	3816
January	1st to 10th	Night	10% 14% 9% 25% 7% 5% 4 3 4 4 15%	6348
	11th to 20th	Night	11% 15% 8% 19% 12% 11% 5% 3 4 4 8%	6360
	21st to end	Night	11% 19% 9% 20% 7% 5% 5% 4 4 5% 12%	6996
February	1st to 10th	Night	11% 15% 7% 15% 12% 7% 5% 4 4 4 16%	2631
	11th to 20th	Night	12% 15% 6% 14% 8% 6% 5% 4 5% 5% 19%	2365
	21st to end	Night	14% 14% 5% 14% 7% 6% 4 4 4 5% 24%	1980
March	1st to 10th	Night	15% 9% 4 8% 4 4 4 3 5% 5% 39%	3853
	11th to 20th	Night	9% 13% 6% 9% 4 3 4 4 5% 6% 37%	3541
	21st to end	Night	14% 14% 7% 12% 4 4 4 3 4 5% 29%	3768
April	1st to 10th	Night	17% 14% 5% 8% 4 3 4 3 6% 7% 30%	1900
	11th to 20th	Night	19% 11% 3 7% 4 3 3 3 5% 6% 35%	1754
	21st to end	Night	16% 11% 3 7% 5% 5% 4 3 5% 5% 37%	1710
May	1st to 10th	Night	14% 7% 3 7% 5% 4 5% 4 5% 7% 40%	2813
	11th to 20th	Night	12% 8% 3 7% 4 4 4 4 5% 7% 41%	2765
	21st to end	Night	17% 6% 2 5% 4 3 4 4 5% 7% 44%	2743
June	1st to 10th	Night	14% 6% 2 6% 4 5% 5% 3 5% 8% 42%	1387
	11th to 20th	Night	8% 6% 2 6% 5% 4 4 4 6% 9% 46%	1330
	21st to end	Night	10% 8% 3 5% 4 4 3 4 6% 8% 45%	1404
July	1st to 10th	Night	12% 7% 3 6% 5% 4 4 4 6% 9% 39%	2530
	11th to 20th	Night	6% 5% 2 6% 4 4 4 4 6% 7% 54%	2530
	21st to end	Night	8% 5% 2 6% 4 4 4 3 6% 9% 49%	2750
August	1st to 10th	Night	10% 6% 2 6% 4 5% 5% 4 6% 7% 45%	2778
	11th to 20th	Night	14% 6% 1 4 3 3 3 3 5% 7% 50%	2785
	21st to end	Night	11% 6% 2 5% 3 4 5% 4 5% 7% 47%	3248
September	1st to 10th	Night	10% 5% 2 6% 4 3 3 3 5% 6% 51%	1936
	11th to 20th	Night	12% 6% 2 4 3 3 4 3 6% 7% 51%	2090
	21st to end	Night	16% 7% 2 6% 4 4 4 4 6% 8% 39%	2090
October	1st to 10th	Night	17% 8% 3 6% 4 3 3 2 4 6% 43%	2099
	11th to 20th	Night	19% 14% 3 8% 4 4 3 3 5% 6% 30%	2346
	21st to end	Night	23% 14% 4 8% 4 3 4 3 5% 6% 26%	2717
November	1st to 10th	Night	13% 12% 4 7% 5% 5% 4 4 5% 7% 33%	2536
	11th to 20th	Night	14% 19% 5% 10% 7% 5% 5% 3 4 5% 23%	2600
	21st to end	Night	18% 19% 7% 11% 6% 4 4 3 4 6% 18%	2716
December	1st to 10th	Night	12% 17% 7% 16% 7% 6% 6% 4 5% 6% 15%	4872
	11th to 20th	Night	12% 25% 8% 15% 6% 5% 4 3 3 4 14%	5582
	21st to end	Night	23% 25% 8% 11% 4 4 3 2 3 3 12%	7157

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	73% 7% 8% 8% 3 1	3618
	11th to 20th	Day	84% 5% 4 5% 2	3620
	21st to end	Day	72% 5% 12% 8% 4	3982
February	1st to 10th	Day	71% 4 8% 13% 3 1	1767
	11th to 20th	Day	67% 7% 9% 10% 6% 1	1928
	21st to end	Day	65% 5% 9% 15% 4	1650
March	1st to 10th	Day	54% 6% 12% 19% 9% 1	3220
	11th to 20th	Day	55% 7% 12% 18% 6% 2	3448
	21st to end	Day	61% 7% 8% 15% 9% 1	3891
April	1st to 10th	Day	58% 5% 10% 16% 10%	2280
	11th to 20th	Day	52% 5% 9% 19% 14% 1	2375
	21st to end	Day	51% 6% 11% 15% 13% 3	2470
May	1st to 10th	Day	44% 8% 11% 18% 17% 2	4120
	11th to 20th	Day	37% 8% 13% 26% 14% 2	4117
	21st to end	Day	37% 7% 12% 21% 21% 3	4837
June	1st to 10th	Day	40% 7% 13% 24% 14% 2	2783
	11th to 20th	Day	39% 8% 12% 23% 17% 1	2850
	21st to end	Day	42% 7% 13% 23% 13% 1	2768
July	1st to 10th	Day	46% 6% 13% 20% 14% 1	4371
	11th to 20th	Day	32% 8% 13% 31% 16% 1	4365
	21st to end	Day	35% 8% 14% 24% 18% 1	4662
August	1st to 10th	Day	39% 8% 12% 26% 13% 1	4135
	11th to 20th	Day	39% 6% 12% 28% 13% 1	4083
	21st to end	Day	41% 6% 12% 26% 12% 1	4403
September	1st to 10th	Day	39% 8% 13% 24% 15% 1	2224
	11th to 20th	Day	36% 6% 15% 28% 14% 1	2090
	21st to end	Day	44% 6% 15% 24% 10%	2090
October	1st to 10th	Day	34% 5% 10% 32% 18% 2	3458
	11th to 20th	Day	53% 4 9% 21% 13%	3019
	21st to end	Day	62% 5% 11% 16% 5%	3081
November	1st to 10th	Day	54% 7% 11% 21% 7%	1762
	11th to 20th	Day	64% 7% 14% 10% 5%	1800
	21st to end	Day	71% 5% 12% 10% 3	1680
December	1st to 10th	Day	82% 5% 6% 6% 1	2312
	11th to 20th	Day	78% 4 7% 10% 2	2621
	21st to end	Day	82% 4 5% 6% 4	3816
January	1st to 10th	Night	71% 6% 8% 10% 4 1	6348
	11th to 20th	Night	79% 6% 7% 6% 3	6360
	21st to end	Night	73% 7% 7% 9% 3	6996
February	1st to 10th	Night	68% 6% 8% 13% 4 1	2631
	11th to 20th	Night	64% 6% 11% 14% 5% 1	2366
	21st to end	Night	62% 6% 11% 15% 7%	1980
March	1st to 10th	Night	47% 5% 16% 22% 9% 1	3853
	11th to 20th	Night	45% 6% 15% 23% 10% 1	3541
	21st to end	Night	55% 7% 12% 19% 8% 1	3768
April	1st to 10th	Night	52% 6% 10% 19% 12% 1	1900
	11th to 20th	Night	48% 6% 9% 21% 14% 2	1754
	21st to end	Night	47% 6% 12% 18% 15% 2	1710
May	1st to 10th	Night	42% 8% 11% 18% 18% 4	2840
	11th to 20th	Night	39% 7% 10% 28% 14% 1	2766
	21st to end	Night	38% 7% 15% 20% 16% 4	2751
June	1st to 10th	Night	39% 6% 11% 25% 18% 1	1387
	11th to 20th	Night	34% 8% 14% 25% 17% 2	1330
	21st to end	Night	36% 7% 13% 26% 16% 2	1404
July	1st to 10th	Night	40% 5% 12% 25% 13% 5%	2490
	11th to 20th	Night	28% 5% 14% 36% 16% 1	2482
	21st to end	Night	31% 8% 17% 25% 18% 1	2662
August	1st to 10th	Night	36% 7% 15% 27% 14% 1	2769
	11th to 20th	Night	32% 5% 16% 31% 14%	2812
	21st to end	Night	35% 6% 15% 26% 18% 1	3248
September	1st to 10th	Night	31% 8% 13% 30% 17% 2	1936
	11th to 20th	Night	32% 6% 14% 33% 15%	2090
	21st to end	Night	42% 8% 14% 26% 9% 1	2090
October	1st to 10th	Night	34% 4 13% 33% 16% 1	3502
	11th to 20th	Night	46% 5% 10% 25% 14%	3895
	21st to end	Night	53% 4 13% 24% 6%	4467
November	1st to 10th	Night	49% 7% 14% 21% 9% 1	2536
	11th to 20th	Night	62% 6% 13% 13% 6% 1	2600
	21st to end	Night	67% 6% 13% 11% 2 1	2716
December	1st to 10th	Night	69% 7% 12% 10% 2	4872
	11th to 20th	Night	73% 6% 8% 9% 4	5585
	21st to end	Night	77% 4 7% 5% 6%	7157

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	23% 19% 38% 15% 5%	300
	11th to 20th	Day	26% 18% 42% 11% 3	300
	21st to end	Day	28% 16% 37% 14% 4	330
February	1st to 10th	Day	22% 32% 33% 9% 3 2	300
	11th to 20th	Day	24% 28% 37% 10% 1	300
	21st to end	Day	30% 26% 38% 5% 1	249
March	1st to 10th	Day	25% 28% 37% 10% 1	300
	11th to 20th	Day	23% 18% 35% 17% 6% 1	434
	21st to end	Day	29% 16% 28% 21% 5% 1	506
April	1st to 10th	Day	26% 18% 34% 16% 5% 1	460
	11th to 20th	Day	31% 21% 26% 14% 6% 2	452
	21st to end	Day	25% 18% 26% 22% 8% 2	460
May	1st to 10th	Day	23% 20% 31% 17% 6% 3	463
	11th to 20th	Day	17% 14% 29% 28% 6% 4	506
	21st to end	Day	16% 13% 30% 28% 10% 3	734
June	1st to 10th	Day	14% 16% 32% 26% 9% 3	680
	11th to 20th	Day	16% 13% 33% 24% 11% 3	680
	21st to end	Day	16% 12% 32% 27% 10% 3	680
July	1st to 10th	Day	9% 9% 31% 28% 16% 6%	671
	11th to 20th	Day	11% 10% 28% 28% 17% 6%	668
	21st to end	Day	10% 7% 31% 31% 17% 5%	739
August	1st to 10th	Day	9% 5% 27% 28% 19% 11%	520
	11th to 20th	Day	11% 8% 19% 34% 16% 10%	479
	21st to end	Day	18% 9% 24% 27% 17% 5%	539
September	1st to 10th	Day	15% 11% 25% 25% 15% 9%	490
	11th to 20th	Day	11% 9% 21% 29% 20% 10%	490
	21st to end	Day	19% 13% 21% 29% 13% 6%	490
October	1st to 10th	Day	23% 16% 28% 18% 12% 2	490
	11th to 20th	Day	29% 17% 35% 16% 2	419
	21st to end	Day	33% 21% 31% 10% 4 1	330
November	1st to 10th	Day	30% 20% 30% 16% 4 1	300
	11th to 20th	Day	28% 21% 36% 12% 2	300
	21st to end	Day	25% 25% 34% 14% 2	240
December	1st to 10th	Day	32% 21% 31% 10% 6% 2	200
	11th to 20th	Day	29% 26% 32% 12% 2	200
	21st to end	Day	31% 25% 31% 9% 3 1	293
January	1st to 10th	Night	20% 19% 36% 20% 5% 1	1000
	11th to 20th	Night	24% 17% 33% 20% 5% 1	1000
	21st to end	Night	21% 12% 39% 23% 5% 1	1100
February	1st to 10th	Night	20% 16% 38% 22% 4	831
	11th to 20th	Night	23% 20% 31% 22% 4	783
	21st to end	Night	25% 18% 34% 20% 3	660
March	1st to 10th	Night	19% 16% 35% 23% 7% 1	800
	11th to 20th	Night	20% 17% 35% 22% 6%	767
	21st to end	Night	22% 14% 33% 25% 6% 1	812
April	1st to 10th	Night	21% 15% 35% 24% 4 1	570
	11th to 20th	Night	23% 15% 32% 24% 6% 1	563
	21st to end	Night	20% 10% 34% 29% 6% 1	570
May	1st to 10th	Night	16% 10% 35% 30% 8% 1	570
	11th to 20th	Night	16% 10% 31% 32% 10%	561
	21st to end	Night	15% 6% 28% 34% 15% 1	617
June	1st to 10th	Night	17% 6% 30% 36% 11%	437
	11th to 20th	Night	10% 7% 32% 40% 10%	380
	21st to end	Night	12% 6% 30% 35% 15% 2	454
July	1st to 10th	Night	9% 3 21% 44% 21% 2	555
	11th to 20th	Night	7% 5% 25% 37% 24% 2	552
	21st to end	Night	11% 3 25% 38% 22% 1	624
August	1st to 10th	Night	11% 2 23% 40% 22% 1	567
	11th to 20th	Night	10% 4 19% 35% 29% 3	564
	21st to end	Night	15% 5% 22% 39% 19% 1	627
September	1st to 10th	Night	12% 4 27% 31% 22% 4	606
	11th to 20th	Night	14% 6% 22% 34% 21% 4	760
	21st to end	Night	19% 8% 23% 32% 14% 4	760
October	1st to 10th	Night	21% 10% 26% 30% 13% 1	760
	11th to 20th	Night	26% 13% 30% 24% 7%	760
	21st to end	Night	31% 14% 29% 21% 6%	836
November	1st to 10th	Night	20% 15% 34% 24% 7% 1	780
	11th to 20th	Night	23% 18% 36% 19% 4	800
	21st to end	Night	27% 14% 38% 18% 3	800
December	1st to 10th	Night	24% 16% 34% 21% 4	975
	11th to 20th	Night	25% 17% 38% 16% 4 1	1000
	21st to end	Night	30% 15% 33% 19% 2	1100

Page generated at 2025-03-09 08:08:43. Version ac07

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